MS Rubinar 8/500 Macro

MS Rubinar 8/500 Macro

The MC Rubinar 8/500 Macro lens is, if not a masterpiece of Russian thought in the creation of lenses, then certainly a separate and interesting branch of it. The lens is being produced at LZOS, although currently with big problems. If you have ever seen an optical telescope, you probably noticed one of its features: a rather wide diameter and, by photographic standards, insufficient length for its focal length (remember, astronomers look at stars) - if it contained only lenses, it would be 2-2.5 times longer. The whole secret is in a pair of light-collecting mirrors installed inside the lens, in addition to the lenses themselves. Because of this, such lenses are called mirror-lens lenses, and since ordinary lenses have lenses, they are simply mirror lenses.

The MC Rubinar 8/500 Macro was provided to us for testing by the iFocus online store, to which we once again want to say “thank you” for providing a mentee for the test, as well as generally for their professionalism and manic passion for photography.

Price and analogues

For its price of 8900 rubles . The lens has no competitors. Even Sigma zooms, which have this focal length in their arsenal, cost three times more, and these are only budget solutions; such focal lengths are more expensive for professionals. The advantage, naturally, is in autofocus and exposure metering. The disadvantage is weight and size. Rubinar's huge consumer drawback is that it is very difficult to buy today, even used, and if you find it, consider yourself a lucky person. The moon in such a lens almost covers the entire frame.

Appearance, equipment and operation

The lens's equipment is interesting even by Soviet standards. The lens bag corresponds to its size, with a regular strap, and contains, in addition to the lens itself, two more filters, an orange one and an incomprehensibly included neutral one - due to its aperture, it’s even difficult to think of a case when it would really be needed. However, the diameter of the front lens is 77 mm, corresponding to most professional glasses, so there is a use for the filters. The kit also includes a screw-in hood - when you see these, you want to execute the designers who didn’t think of a banal bayonet mount, because the front cover is no longer included in it. Two caps are a standard set for the lens, as well as instructions. Moreover, there will still be quite a lot of space left in the bag, some of which will certainly be spent on an adapter for your bayonet mount (price 600-900 rubles).

The lens is iron, with a wide focus ring covered with ribbed rubber for comfort. The diameter of the lens along its entire length, except for the mounting thread, is unchanged (about 80 mm), which raises questions about its installation on compact DSLRs. On Nikon D300s and D90 it sits normally, without resting on the part of the body where the prism is hidden. There is no autofocus, the focus ring travel is large and tight.

The focal length of the lens is 500 mm, which on a cropped DSLR already corresponds to 750 mm, the size used for tracking. No joke at all, with this lens you can spy on your neighbors from the house opposite, you just need to stock up on a tripod to work at long shutter speeds. Adding budget teleconverters in such cases also helps (we were provided with a ×2 along with it, which made us feel like scouts). By the way, lenses with such a focal length are usually much larger, so it can safely be called compact.

Optical characteristics

Now we have come to the most interesting thing, namely, why, despite all its visible advantages (compactness with its focal length, metal body), the lens is not wildly popular. It’s also not difficult to answer a simple question if you carefully read the name of the lens, where it is written that its relative aperture is only f/8, i.e., you won’t open the aperture any further. However, and that’s not all... the fact is that there is no aperture here, as such, at all, so the glass has a fixed not only focal length, but also aperture, which limits your tools to just one shutter speed. However, if you screw on the included ND, you can win one stop (Zeniths did not have a shutter speed shorter than 1/250s, which is why you had to look for moves).

Don't forget that f/8 is dark. However, what to compare with: for the wide-angle position of a kit lens, this is a good hole for shooting landscapes, because there not only 1/125s, but even 1/20s or more will be enough for a sharp shot. Here such tricks do not work, it is enough to remember the simplest photographic rule: pictures are sharp at a shutter speed inverse to the focal length, i.e. on a lens with a 500mm DF, you should set it to at least 1/500. But 1/500 at f/8 on a sunny day with minimum sensitivity is difficult to achieve, unless, of course, you are shooting sheets of paper on a sun-drenched beach.

There are two ways out of the situation: either put the device on a monopod (tripod), or turn the ISO to raise the desired shutter speed. On a bright sunny day, I was able to achieve the required shutter speed only at ISO 640-800. But this way you can shoot it with your hands. However, you shouldn’t indulge yourself too much in this either - the minimum focusing distance in the lens is 1.5 meters, and the depth of field is very small, even taking into account the small hole. As a result, you get the following situation: you are standing a couple of meters from the flower, the image in the viewfinder is shaking, you are also swaying back and forth - no, I didn’t drink, it’s just that with such a depth of field, every millimeter is critical. In principle, you quickly get used to such a situation - you set short shutter speeds and learn to shoot on the fly. But if you want to photograph the windows of a neighbor’s house (quite possible, by the way, but punishable in court), you can’t do without a good tripod. Here you will have to work at long shutter speeds (remember, you are renting a room), and the weight of the camera and lens will be considerable.

With such a focusing distance, even the air, if it is not transparent enough, will interfere - the frames will turn out to be less contrasty, although this may also be a consequence of side flare. The hood, obviously, still needs to be screwed on. True, then you can’t insert the lens cap inside - there is no thread, and the cap does not have a grip in the middle to remove it.

In all other respects, the lens works very well, you just need to get used to it. It was tested on a Nikon D300s camera, which was received for testing thanks to the Nikon representative office. With it, the lens's aperture priority mode fully works, because the exposure metering is done correctly there. Autofocus, of course, does not appear.

Another feature is the “donuts” in the bokeh, characteristic of SLR lenses, since in the middle of the lens there is a black rear reflector cap, which forms a spot. There’s nothing terrible about this, it’s just a feature that sometimes turns out even cool, although personally it annoyed me. The lens generally blurs the background well, which is normal for macro glass.

Glass should be treated very carefully - there is an assumption that, even taking into account the metal body, it is still fragile.

Gallery of pictures

All images were taken in RAW, during conversion they were developed “zero-wise”, with only color noise clamped in critical lighting situations and a small sharpening (50 units at a sensitivity of 0.5 - our standard for lens tests) and adding contrast through a small bend in the curve in the shape of the letter S (0, 30, -30, 0, by quarter curve). For the blog they are in a reduced form below, full-size ones in the archive can be downloaded from this link (73 MB).

MS Rubinar 8/500 Macro

Lens MS Rubinar 8/500 MACRO

Photographic lens MS Rubinar 8/500 and digital camera and Canon 10D
There will definitely be test photos! —>

The photographic lens MS Rubinar 8/500 MACRO can be used as a replacement lens in various modern cameras using adapter rings with an M42x1 mounting thread. This meniscus mirror telescopic lens is used for shooting distant objects, inaccessible areas of terrain, landscapes, architectural elements, sports competitions, and is indispensable for photo hunting, as a lens in the paparazzi's arsenal. Can be used to photograph the moon and other celestial bodies. The use of multilayer antireflective coatings on optical parts significantly increases light transmission, reduces light scattering, and increases the contrast of the image on photographic film or the matrix of a digital camera.

Telephoto lens MC Rubinar 8/500 MACRO , produced (as of 2010) at the Lytkarino optical glass plant - LZOS. MC Rubinar 8/500 MACRO is a descendant of other meniscus reflex lenses, such as the ZM-5A and the 3M-5 SA lens . This is a very compact telephoto lens. Compactness is achieved through the design of the optical system, which uses lenses and spherical mirrors. In 1941, D. D. Maksutov determined that the spherical aberration of a mirror can be compensated for by a meniscus of large curvature. Having found the right distance between the meniscus and the mirror, Maksutov managed to get rid of coma and astigmatism.

The lens was originally designed for film SLR cameras, but can be successfully used with modern digital SLRs. True, there are several problems.

1. It is difficult to install Rubinar on some models of digital cameras - the protrusion of the camera’s built-in flash gets in the way. This problem is solved simply, but in a barbaric way: a chamfer of 0.5 - 1 mm is ground in a circle on the interfering part of the lens. I was lucky, my Canon 10D lens is installed via a standard adapter, so I didn’t have to cut anything.

2. Crop factor of modern digital SLR cameras. The focal length of the MS Rubinar 8/500 MACRO increases by 1.5 - 2 times, depending on the system used. Hence all the ensuing consequences: the need to use a tripod, very strong hands, restrictions on shooting conditions, the use of release cables. All this is doubly true when using double (2 x ) teleconverters (pardon the pun).

3. Shallow depth of field. The lens does not have an automatic focusing system; you have to focus manually, and if you have a not very bright viewfinder, it is very easy to miss when aiming at the subject, and getting into the depth of field is almost impossible. At a distance of 10 m, the depth of field (DOF) is only 10 cm.

4. Relatively narrow scope of application: experiments, astrophotography, wildlife, for pararation (maybe).

5. A bit dark. Especially with a teleconverter.

But there are also advantages. There are more of them: 1. This is the most compact and lightest telephoto lens with a focal length of 500mm 2. Relatively low price. 3. Adding an eyepiece attachment Tourist-FL turns the lens into a spotting scope with a magnification of 55x 3. Astrophotography, photo hunting, just shooting from a long distance. 4. Great photos can be taken in good lighting.

Separately, I would like to note the interesting pattern that this and other mirror-lens lenses provide. Bright point objects that are in the blur zone look like donut circles. They look unusual and funny. The more concentric these circles are, the better adjusted this Rubinar .

Published 08/12/2008

* Please notify the author of any inaccuracies you notice.

Tuning RUBINAR 500mm and ZM-5A 500mm

#1 Guro

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• City: Kiev

I have a ZM-5A 500/8 in stock.
The lens is very interesting with its 500mm, small dimensions and weight
, and even the donut bokeh suits me)
But it’s not sharp enough for photo hunting and is a bit dark..

I found this interesting article on MC RUBINAR 5.6/500
https://slrphoto.narod.ru/rubinar.htm
I was very interested in the latest manipulations with the lens, which actually made it possible to increase sharpness and even aperture ratio.
And namely:
1 - inversion of the second meniscus - coma corrector (2);
2 — removal of the field corrector.

In principle, the ZM-5A belongs to the same SLR lenses and its optical design should be, if not the same, then very similar.
That's interesting.
Is it possible to perform the same manipulations with it? Who among the knowledgeable people can tell me not to disassemble the lens in vain? )

#2 Skinny

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• City: Moscow

#3 Berezentsev

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• City: Perm

Guro (12.7.2008, 15:54) wrote:

Post edited by Berezentsev: 15 July 2008 - 14:33

#4 NetSkater

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#5 Guro

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• City: Kiev

I removed the two rear lenses from ZM-5A.
However, infinity disappeared
and not just disappeared.
and focusing began from about eight meters. although subjectively it seems sharper.

So I returned them back.
Compared with what it was.
It hasn't gotten any worse. I haven't decided to loosen the front mirror yet.
I don't know what tool to do this with.

PHOTO OF THE MOON IS SUPERB!
What additional devices were used?)

#6 Elm

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#7 Berezentsev

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Guro (15.7.2008, 23:57) wrote:

To restore infinity, you need to unscrew the infinity limiter.
I use a sharpened caliper to loosen the nuts.
You will also need a watch screwdriver. Don't forget to loosen the locking screws.

For Elm: Soviet lenses require loosening of the frame because Uncle Vasya assembled them.
Such a lens, like a car, requires tightening after purchase, but if the nuts on the car need to be tightened, then on the lens they need to be loosened. The ZM-5A, which I bought about 3 years ago, did not require “broaching”. It looks like they have learned how to collect. I haven’t held Japanese SLR lenses in my hands, but for some reason I think that they don’t require fine-tuning.

#8 Guro

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I would like to know where it is)))
If you explain in more detail, I would be very grateful.

I weakened the front lens.
I didn't notice any difference in quality. Maybe I’m doing something wrong, maybe I’m weakening it...
I found the optical design of this lens.
Maybe someone needs
https://pix.playground.ru/download/gallery/.
d420d3cfef9.jpg Author: Bianor

PS: Maybe it’s really worth moving the topic to Homemade Products.

#9 NetSkater

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Berezentsev (16.7.2008, 8:05) wrote:

To restore infinity, you need to unscrew the infinity limiter.
I use a sharpened caliper to loosen the nuts.
You will also need a watch screwdriver. Don't forget to loosen the locking screws.

For Elm: Soviet lenses require loosening of the frame because Uncle Vasya assembled them.
Such a lens, like a car, requires tightening after purchase, but if the nuts on the car need to be tightened, then on the lens they need to be loosened. The ZM-5A, which I bought about 3 years ago, did not require “broaching”. It looks like they have learned how to collect. I haven’t held Japanese SLR lenses in my hands, but for some reason I think that they don’t require fine-tuning.

#10 Guro

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#11 NetSkater

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#12 Berezentsev

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#13 Berezentsev

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Guro (16.7.2008, 13:58) wrote:

#14 Guro

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#15 Guro

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• City: Kiev

did!
untwisted
it turns out the focus lock is the division scale ..
there you don’t have to cut anything down, just put it aside

So:
I removed the lenses from the back.
restored infinity.

what has changed:
- the lens has really become sharper, clearer, and seems lighter.
— now you can focus even from a meter)) i.e.
shoot macro 1:3 somewhere. But in macro it is nothing. At a constant aperture of 8, low aperture... and even with a mad dance at such focal lengths. - the focal lengths have become a little smaller (this is even good, otherwise it was 750mm on the crop)
- the very edges of the frame begin to smudge.
but this area is very small. — BOKE changed a little. More ringed

PS: I tried to photograph people and creatures today.
The results are much better, sometimes even acceptable. It's a pity I won't have time to show you. I'm leaving soon.

#16 kestrel

Pentax Fans Section

• City: Chisinau (Moldova)

Thanks to the author.
With this topic, he pushed me to buy a similar lens. I have MS ZM-5SA.
To our great joy, the lens did not require adjustment, judging by its bokeh (see last photo).
The lens easily adjusted to 10 without extension rings. I’m thinking about attaching a bayonet adapter to it “permanently.” In the evening I'll go take pictures of the moon.

And here is the picture that was taken using this “telescope”. The distance to the pipe (shown by the arrow in the previous photo) is about 40-45 meters.

Post edited by kestrel: July 22, 2008 - 18:00

#17 Guro

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It’s difficult to judge by the bokeh
because some of the rings are uneven.
and the sharpness is insufficient.

Removing lenses and a focus lock is not just an adjustment. It's just so much lighter and sharper... but the very edge smudges a little.

If you’re photographing people (and that’s what it’s interesting for), then I didn’t think it was sharp enough. Now it’s better, now the only problem is movement and manual focusing)

#18 kestrel

Pentax Fans Section

• City: Chisinau (Moldova)

Post edited by kestrel: July 24, 2008 - 21:37

maxlion

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“Reality is becoming more and more like photography. " — Susan Sontag

Mirror-lens lens "MS Rubinar 500/8 Macro"

Today, the “voyeur with a TV camera” took out a mirror-lens lens from the bins - “MS Rubinar 500/8 Macro”. At foreign auctions you often see similar “mirrors” under various Korean and Chinese brands, and their description states “Maksutov’s optical system”. You feel proud of your country and our scientists. Perhaps those lenses use an outdated Maksutov optical design, while the Rubinar, made on the basis of the MTO, had a modified Maksutov-Cassegrain design with a prefocal field corrector.

Along with the lens, I also had to get a Chinese Era tripod, which, of course, is never suitable for such a heavy system - twice during the day the camera tried to fly off the head of the tripod, fortunately, the strap was in my hand.

Among photographers, lenses produced at the Lytkarino Optical Glass Plant (LZOS) are notorious, but I can’t say anything bad about this specimen No. 030192, released in May 2003. Now LZOS is a fully alive enterprise that produces medical equipment, night vision devices, telescopes and spotting scopes, microscopes, etc. It is the largest (or the only remaining?) manufacturer of optical glass in the Russian Federation.

Judging by the technical condition and appearance, I am the second owner of this lens. It came to me completely complete in accordance with the attached instruction manual.

The lens has an extreme focal length of 500 mm and a narrow field of view of only 5°, and on the K20D the equivalent focal length will be 750 mm, while the angle of view and depth of field becomes even smaller. Its minimum focusing distance (MFD) is 220 cm, and this is considered a 1:4 macro mode for this class.

Due to the shallow depth of field, focusing is very difficult in practice (especially compared to a wide-angle). However, sometimes I still managed to get sharpness - and then, with my back to the sun, the lens showed itself at its best.

The design features of the lens significantly limit the freedom of the photographer. Everything here affects the quality of the image, including air temperature and humidity. The lens has a fixed aperture, but comes with a 4x ND filter. I shot at a sensitivity of 400 ISO, and in the evening in the shadows of buildings I had to set the shutter speed in the region of 1/250–1/500, or even longer. And rightly so - it’s not a good idea to shoot in the shadows with such a dark lens. Only in open sun. Again, “bagels”.

The bokeh shape is a “signature” feature of mirror-lens lenses. Due to its unique design, only part of the front lens works - the ring; because of this, point light sources (for example, the glare of the sun on tree leaves) in the photo will be depicted in the form of rings, “donuts”.

In short, I need a good tripod. But there is a prospect. Here, for example, is a picture from iXBT. On it Casio QV4000 + Helios-44 + MS Rubinar 500/8.

Let's calculate the magnification factor. 500 x 1.5 (camera crop factor) = 750 mm is the EGF, the equivalent focal length. We divide the resulting focal length by 50 mm, we get 15. So, compared to a standard lens for a 35 mm camera, the lens has a 15-fold magnification.

MS Rubinar 8/500 Macro

Foto&Video 2'2000
e-mail: [email protected] tel.:(095)-955-1584, 234-4797

REFLECTION IN THE LENS

This material discusses two telephoto lenses with a mirror-lens design:
MS Rubinar - 5.6/500 macro
MS Rubinar - 10/1000 macro

These “Rubinar” are the most modern models of mirror-lens meniscus lenses, the so-called “Maksutov”.
These are “siblings” of the famous MTO (this abbreviation denotes mirror-lens lenses with the Maksutov optical system) and they are also produced near Moscow, in the city of Lytkarino, at the Lytkarino Optical Glass Plant (JSC LZOS). The design of the current “Rubinars” has been slightly changed: previously, the secondary mirror was applied to the back of the front meniscus lens - now it is mounted on a plastic “plug” in the hole in the center of the meniscus.
Compared to their ancestors, these lenses are much more compact and fast.
"Rubinar 5.6/500 macro" has a nominal aperture ratio of 1:5.6. This is very significant, since at such aperture the focusing devices already work normally: microraster and Doden wedges. To focus when working with Rubinar 10/1000 macro, it is better to use simple frosted glass, or even better, modern focusing screens with “laser matting”.
Nevertheless, even despite the low aperture, the electronic rangefinder works with this lens in modern autofocus cameras. Due to the fixed aperture ratio, the depth of field, unfortunately, cannot be adjusted.
The aperture you aim at is the one you shoot at. It's especially difficult to get anything acceptable in macro mode: at a focal length of 500mm and shooting at 1:4 scale, the depth of field will only be about 6mm. “Rubinar” have mounting sockets on a special ring for mounting on a tripod, so the camera and lens can be rotated to a vertical frame without removing it from the tripod.
For the 500 mm, this ring is fixed with a screw, which is more convenient. Both lenses are available in two versions - either for K mount (Penlax-K) or for M42x1 thread.
The threaded version is more practical, since it can be used with many models of devices: there are many adapters from the thread to different types of mounts - the same Pentax K, 42/N (Nikon), Yashica/Contax (Y/C) and even the Canon EOS mount. Also, we must not forget that modern “DSLRs” have a housing protrusion for the built-in flash, which can prevent the installation of a mirror-lens lens, so you will have to place a short extension ring between the shank and the adapter.
Moving the lens forward a little has no effect on focusing. But to install a bayonet version, for example, on a Pentax MZ series camera, you will need an extension ring with a minimum thickness of 12mm, which may make aiming at “infinity” impossible.
The lenses are suitable for nature photography, especially from cover in open areas.
With a 500 mm lens from 4 meters (scale 1:8), some bird will turn out to be exactly the size of the frame and almost all of it will be sharp. They are also suitable for filming competitions in some sports, especially water sports. The use of reflex lens lenses is not limited to photography.
They make good observational instruments: for example, amateur astronomers have been making telescopes from MTO-1000 for a long time. To do this, “Rubinar” must be equipped with an eyepiece and installed on a special mount. With the Rubinar 10/1000 macro lens you can get an image of the moon with a diameter of 9 mm on film. The same Lytkarino Optical Glass Factory produces an excellent product - the Tourist-FL eyepiece attachment ($8.5 - in the illustration), which is an eyepiece with a wrapping system; the 58-mm Helios-44 with such an attachment turns into a six-fold telescope , “Rubinaries” 500 and 1000, respectively, in 55x and 110x telescopes.
The results of laboratory testing once again show that the more complex the characteristics of a lens, the more difficult it is to work with.
The resolution of both is low, and professional picture quality is obtained only with absolutely precise focusing (the minimum resolution requirement is about 25 lines/mm).
The slightest shift of the aiming plane takes the object out of the sharp image zone. True, due to the significant focal length, the lenses actually worked on a macro scale (the distance during test shooting was less than 5 meters), which usually worsens the result somewhat.
Light transmission is also low: 53% and 44%, respectively.
That is, the real aperture of the lenses is almost one step less than the nominal one. This should be kept in mind by those who use a separate exposure meter. Therefore, when working with these lenses, a device with TTL through-the-lens exposure metering is desirable. By the way, several filters are supplied with the lenses, the imported analogues of which are more expensive than the Rubinar lens itself.
And although the SLR telephoto lenses in question are low-aperture, the advent of modern high-speed films has breathed new life into them.

Estimated cost:
$90 (“MSRubinar-5.6/500 macro”);
$110 (“MSRubinar-10/1000 macro”)

Pros: price
Cons: fixed aperture

MS Rubinar 8/500 Macro

"MS RUBINAR-K 10/1000 macro"

A photographic mirror-lens lens with multi-layer anti-reflective coatings on optical surfaces is intended as a replacement lens for SLR cameras with a frame format of 24x36 mm. The lens allows you to take photographs on black-and-white and color film. The lens has a macro limit, the closest shooting distance is 4 m. When shooting from a tripod, it is possible to compose the frame by rotating the lens with the camera in a special rotating ring. The lens is designed for photo hunting, close-up photography of landscapes, architectural structures, sports competitions and other distant objects.

Technical data

Focal length, mm 1000
Geometric relative aperture 1:10
Angular field of view, deg.
2.5 Focusing limits, m 4. “infinite.”
Working distance, mm 45.5
Type of connection to the camera:
“MS Rubinar-K 10/1000 macro”
“MS Rubinar 10/1000 macro” mount “K frame”
thread M42x1
Connecting size for filters, attachments and hood M116x1
Connecting size for tripod , inches 1/4
Smooth connection for nozzles, mm 122
Overall dimensions without covers, when installed at “infinity”, no more, mm
length 210
diameter 125
Weight without covers, no more, kg 2.3

"MS RUBINAR-K 4.5/300 MACRO"

Photographic mirror-lens lenses "MS Rubinar-K 4.5/300 macro" and "MS Rubinar 4.5/300 Macro" with multi-layer anti-reflective coating of optical surfaces are intended as replacement lenses for SLR cameras with a frame format of 24x36 mm. The “MS Rubinar-K 4.5/300 Macro” lens is designed for installation on a camera with a bayonet connection of the “K-Frame” type. The MS Rubinar 4.5/300 Macro lens is designed for installation on a camera with an M 42x1 threaded connection. Lenses are used to photograph distant objects, inaccessible areas, architectural elements and sports competitions. Lenses are indispensable for photo hunting. Lenses are used in black and white and color photography. Operate at temperatures from minus 15 to plus 45°C.

Technical data

Focal length, mm 300
Geometric relative aperture 1:4.5
Field of view angle, deg 8
Focusing range, m from 1.7 to infinity
Working distance, mm 45.5
type of connection to the camera Bayonet “Frame K” or threaded M 42x1
Connection thread for attachments and filters M 77x0.75
Length of the lens to the supporting surface when installed at a distance of “infinity”, without covers, mm 98
Largest diameter of the frame, mm 92
Weight, without covers, kg 0.7

"MS RUBINAR-K 5.6/500 MACRO"

Photographic mirror-lens lenses "MS Rubinar-K 5.6/500 macro" and "MS Rubinar 5.6/500 Macro" with multi-layer anti-reflective coating of optical surfaces are intended as replacement lenses for SLR cameras with a frame format of 24x36 mm. The “MS Rubinar-K 5.6/500 Macro” lens is designed for installation on a camera with a bayonet connection of the “K-Frame” type. The MS Rubinar 5.6/500 Macro lens is designed for installation on a camera with an M 42x1 threaded connection. Lenses are used to photograph distant objects, inaccessible areas, architectural elements and sports competitions. Lenses are indispensable for photo hunting. Lenses are used in black and white and color photography. Operate at temperatures from minus 15 to plus 45°C.

Technical data

Focal length, mm 500
Geometric relative aperture 1:5.6
Field of view angle, deg 5
Focusing range, m from 2.2 to infinity
Working distance, mm 45.5
type of connection to the camera Bayonet “Frame K” or threaded M 42x1
Connection thread for attachments and filters M 105x1
Connecting thread for mounting on a tripod, inches 1/4
Length of the lens to the supporting surface when installed at
a distance of “infinity”, without covers, mm 130
Largest frame diameter, mm 113
Weight, without covers, kg 1, 6

"MS RUBINAR-K 8/500 MACRO"

Photographic mirror-lens lenses "MS Rubinar-K 8/500 macro" and "MS Rubinar 8/500 Macro" with multi-layer anti-reflective coating of optical surfaces are intended as replacement lenses for SLR cameras with a frame format of 24x36 mm. Lenses are used in black and white and color photography. Used when photographing from long distances. Operate at temperatures from minus 15 to plus 45°C.

Technical data

Focal length, mm 500
Geometric relative aperture 1:8
Field of view angle, degrees 5
Focusing range, m from 2.2 to infinity
Working distance, mm 45.5
Macro photography scale 1:4
Type of connection to the camera Bayonet “Frame K” or threaded M 42x1
Connecting thread for attachments and filters M 77x0.75
Length of the lens to the supporting surface when installed at
an infinity distance, without covers, mm 99
Largest frame diameter, mm 81
Weight, without covers, kg 0.55

MS Rubinar 8/500 Macro

The desire to increase the focal length of lenses while maintaining small frame dimensions led to the creation of an original design for lenses in the “MTO” series, consisting of lenses and mirrors applied to a spherical surface.

Rubinar lenses were created on the basis of MTO photographic lenses using a modified Maksutov-Cassegrain design with a prefocal field corrector.

Essentially, the Rubinar is a catadioptric telescope with a design different from the Maksutov or Schmidt design and including a pair of full-aperture lenses, a primary and secondary mirror, and a small wavefront curvature corrector lens. The secondary mirror is rigidly connected to the front aperture lens. The main lens mirror is spherical. The curvature corrector is installed in the eyepiece part of the lens behind the main mirror. The central shielding is 13% of the area or 34% of the diameter of the entrance pupil. The lens creates a wide, flat photographic field. Can be used as a lens or telescope. The aperture of various models is from 53 mm to 106 mm.

Lens focusing is manual based on the image on the focusing screen.

The relative aperture opening is constant.

Use with modern digital cameras

Installation on modern digital cameras (DSLR or mirrorless digital cameras with interchangeable lenses) is possible using appropriate adapters (for example, M42×1 - K mount or M42×1 - NX mount).
Installation is often complicated by the presence of a built-in flash on the camera that protrudes very forward.
The diameter of the lens is so large at the base that it can rest against the flash protrusion. The situation can be corrected by using short (up to 7 mm) extension rings. Focusing the lens to “infinity” in this case is possible due to the fact that the focus ring has some overtravel.

Other Features

Due to the optical design of the mirror-lens lens of the Rubinar, only part of the front lens (ring) works, because its central part is blocked by the secondary mirror. Because of this, the energy diagram of the scattering spot has a decline in the center, and, as a result, unsharp point light sources will be depicted in the form of rings (“donuts”).

Using the eyepiece attachment, “Tourist-FL” turns into a telescope with 111x magnification (for “Rubinar-10/1000”).

Options

• MS Rubinar - 4.5/300 Macro
• MS Rubinar - 5.6/500 Macro
• MS Rubinar - 8/500 Macro
• MC Rubinar K - 8/500 Macro (mount - K mount)
• MS Rubinar - 10/1000 Macro
• MC Rubinar K - 10/1000 Macro (mount - K mount)
• "Astro Rubinar 100" (based on "MS Rubinar 10/1000")
• "Astro Rubinar 100C". It does not have a wrapping system for ground-based observations, the design of the main mirror is made of glass-ceramic and the rigid installation of the lens at “infinity” (there is no focusing ring) makes it possible to increase the system’s resistance to changing temperatures and achieve better visual image quality in the center of the field of view.

Model	MS Rubinar 4.5/300 Macro	MS Rubinar 5.6/500 Macro	MS Rubinar 8/500 Macro MS Rubinar K 8/500 Macro	MS Rubinar 10/1000 Macro Save to: MS Rubinar 8/500 Macro Link to main publication For any suggestions regarding the site: [email protected]