View of the lens Uranus-27 2.5 / 100 and examples of photographs from it, especially for Radozhiva, prepared Rodion Eshmakov.
Uranus-27 (Uranus-27) 2.5 / 100
Characteristics of Uranus-27
Optical design: 7 elements in 5 groups, “Uranus” (a variation of Planar)
Resolution (for the format 8 * 8 cm, on the Isopanchrome film type 22 - according to photohistory.ru) center / edge: 44/8 lines / mm;
The field of view angle in the native format (8 * 8 cm): 54 degrees;
Aperture Limits: F / 2.5-F / 16;
Diaphragm design: twelve-petalled, rounded, non-black, without presetting mechanism and ratchet;
Thread diameter for filters: no, smooth nozzles 76 mm;
Mount: cast flange mount to the aerial camera;
Focuser: none;
Features: applicable to all visible light, orthoscopic.
Uranus-27 is an infrequent technical lens that was used for aerial photography with AFA-39 cameras. Apparently, it was produced at the Kazan OMZ, judging by the nameplates of the early lenses.
Design and key features of the adaptation of Uranus-27
Uranus-27 is a massive metal lens block with a diaphragm with a large cast flange mounting an unusual shape.
The indecent dimensions of the lens, especially its fixed flange, complicate the adaptation. But Uranus-27 has a fairly large back segment, which allows you to put it on any small format TsZK. But for medium-format DSLRs, the segment may not be enough.
My lens had oil condensate inside (it came from the diaphragm for many years of storage), which required complete disassembly and cleaning. It is worth noting here that, like any product of the Soviet military-industrial complex, this lens has a simply monumental, foolproof design - each retaining ring is fitted with 1-3 retaining screws; each part is thick, durable and metal, the lens units have their numbers and are planted in accordance with the risks involved. It immediately feels that the lens is assembled extremely high quality.
After service, the adaptation was carried out:
- Dremel sawed the mounting flange neatly - we do not need it. Again, I take off my hat to the engineers - there is as much metal in this metal flange as there are in a dozen G-44-2s.
- A threaded focuser was ordered taking into account the large weight of the lens. The focuser consists of two glasses - on the internal thread turn (like a screw, with a pitch of 36 mm, 1 mm high and 2 mm wide) and another turn of a similar thread (groove), only in the manner of a "nut" (depth and other parameters same) - for the stock. The outer glass - the counterpart ("nut") to the internal thread, has a bottom with M42 thread for attachment to the camera.
- Details were ground, painted, assembled. The lens Uranus-27 was fixed in the inner glass.
In the end, we got such a heavy barrel, which can be hooked onto any modern small-format camera:
Uranus-27 (Uranus-27) 2.5 / 100
Uranus-27 (Uranus-27) 2.5 / 100
Optical properties of the lens Uranus-27
Despite the fact that the lens is designed for medium format - a frame of 8 * 8 cm, it has enough resolution even on a modern digital camera (on which we use only the center of the coating spot). This means that we have a stable 44 lines / mm throughout the frame.
An open diaphragm can be safely called a working diaphragm.
Uranus-27 (Uranus-27) 2.5 / 100
By the way, about the diaphragm - at Uranus-27 it is beautiful, large and even:
Uranus-27 (Uranus-27) 2.5 / 100
Uranus-27 uses the old palette of optical glasses and the old type of enlightenment - single-layer, "blue". Due to this, he is very yellow in lumen:
Uranus-27 (Uranus-27) 2.5 / 100
It seems to me that this is the main drawback of the lens, because blue enlightenment not only distorts colors (leads to the green-yellow area), but also brings its reflections and blue flare. As a result, it is very difficult to correct a picture distorted by a blue veil and an excess of yellow light. By the way, the flare lens does not digest - the slightest back-up plunges it into the "blue abyss".
Veil with the black back of the focuser
However, this is solved by high-quality blackening of the back of the focuser and, of course, an 8-centimeter hood (which is planned to be made). In addition, you can apply a pink Sky-Light filter to reduce the effect of green light on the picture - as a result, the lens will simply warm up to ~ 500K picture, but no more.
Of the aberrations, chromatism affects the image most of all - it often manifests itself in contrasting details on the open diaphragm. Spherical aberrations are quite small.
With aperture already at stop-stop, the sharpness becomes very, very high.
Uranus-27 has, in my opinion, a very nice picture - it has excellent bokeh, good sharpness. Even distorted color reproduction on a sunny day is appropriate, giving the picture an interesting effect.
Conclusions
Uranus-27 is a very unusual lens - aerial photography. Despite its purely technical purpose, it has high optical performance and an excellent picture. The main disadvantage of the lens is a poor enlightenment, which is offset by high-quality blackening and the use of a lens hood. Despite the difficulties of adaptation, the lens fully justifies the expended forces. I recommend.
You will find more reviews from readers of Radozhiva here.
Beautiful photos, and any model will envy the color and section of the cat’s eyes :)
Thank you very much Rodion for an unusual review of an interesting lens ...
It's my pleasure)
I searched for uranium-27 for a long time, really wanted to try it in practice, when I saw a couple of photos on it and an optical scheme.
Finally, the dream has come true. Now it remains only to bring it to mind - to make a hood and a color corrector.
Good luck, may everything turn out the way you want ...
More soap junk to God of soap junk!
We are waiting for your reviews, dear ...
In vain you are so incidentally, the review came out really interesting and not bad. Recently, I’m even starting to like Rodion’s lesson, still no one else sortes this stuff, and out of 10 junk lenses, one, as in the review, comes across very good.
I liked the review. That's just interesting on the 8 * 8 format - will it be a full-time or wide-angle? How to navigate there
At 8 * 8 it will be a regular lens.
You need to navigate by the viewing angle in the native format. If it is from 40 to 55 degrees, it is considered standard, such as an analogue of fifty dollars (45-58 mm).
If the angle is more than 55 - wide. Less - telephoto)
Uranus scheme Formally “wide-angle planar”, but with such a scheme they made (or rather, developed, not the fact that they did) and wide (“Uran-13” 2,5 / 70 (field of view 61 °), “Uran- 14 ”2,5 / 35 (field of view 63 °)), and staffs (Uran-27, Uran-10, Uran-20), and telephoto (Uran-12).
There are also Uraniums for small format (APS-C or so) - these are cine lenses of some OKS / RO series.
Thank you
Just a magical picture of the lens! Pleasant colors, volume, bokeh, and everything you need for art shooting! Something like an old watering can. Many thanks to the author for an interesting review and soulfully selected photos!
interesting glass))
Contrast is not enough
Rodion, beautiful pictures, some are simply mesmerizing :) only the lens was probably originally designed for b / w film, no chromaticity was fixed there; but the contrast, the transfer of small details and midtones should be at their best. It would be interesting to see how it turns out b / w photos.
An interesting assumption, but judging by the description and the photographic film used to determine the resolution (Isopanchrome), the lens is nevertheless adjusted for the entire visible spectrum. But yes, it looks like black and white photographic materials.
There was also a similar Uranus-10 throughout - it was designed for the orange-red region, i.e. was used only with a light filter, because chromatism was not really corrected.
It's the same for aerial photography lens. There, you need to shoot through the thick layer of the atmosphere, respectively, and through the blue haze. So the filter is a necessity, and accordingly the lens should be corrected for the orange-red area
A year ago I had the honor to see Uranium-10 - it practically does not differ from Uranus-27, incl. for correction. So it felt like correcting them for all visible light. But, of course, it can be especially good for the KO area)
Radion, thank you very much for the review! never caught my eye at flea markets. Obviously a rare lens.
On Avito recently lay for 6 kilo rubles. Not cheap, of course, but the lens of money is probably still worth it.
With all due respect to your work, six kilo rupees is not worth it :)
It's a bit too expensive for such a lens!
The price is also formed by the rarity and limited supply. It is clear that for a raw lens this is a bit much.
what kind of cuckoo-like bird? or is it a thrush? it turned out great
Thrush, of course.
And I liked the ladybug) Beautifully Arkady.
This is “beautiful” for Rodion.
I don’t know why the author liked the lens bokeh, any modern fix from this focal range will give a much better blur, without such a pronounced double line. But in general it is very interesting to mess with old lenses. A kind of adventure in which you do not know in advance what you will find :)
Yeah, only a fix from this focal range will have a completely different price. A picture is quite competitive with modern lenses
When you spend a lot of time cutting such a banlura, everything will seem beautiful)))
Bokeshka about nothing as well as lightpower 2.5 I think rather weakly.
And I wonder how Rodion, after all the alterations, still manages to photograph.
Well, the photos are not bad. Growing up, Rodion! You look at a couple of ancient lenses you will shoot like a pro!
All happy photographer, good mood and photos
Ali has a bottle of spray for applying enlightenment on linzah, on hot. No one tried it?
Coating is applied by vacuum deposition. Specifically, the old chemical is by spraying magnesium fluoride.
Also, as an option, acid etching was used ...
In any case, applying enlightenment is a laborious and knowledge-intensive process. You will not apply it with any spray)
Come on. MgF2 does not need to be put on a special mind; the main thing is to spray with a thin layer.
Thanks, laughed.
You are welcome. And what's funny?
And the fact that the layer thickness should be the same and equal to lambda / 4 or lambda / 2.
https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%81%D0%B2%D0%B5%D1%82%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B8 - corny pedivikia.
You will never be able to take a “spray” and apply a normal layer to the lens. And you won't be able to connect him with him.
Well, how can a simple average person know the course of school physics in which all this is described, told and shown why this is so, and not otherwise
about uranium - not a bad thing, judging by the photographs, but he himself would have had 6k for this lens unit and would hardly have poured so much labor into it - for a similar price you can catch more interesting toys
Well, it didn't cost me 6k, of course, the lens unit. But in total, somewhere like that. However, I do not regret that I spent so much - I really liked the lens.
Haha, here they’re laughing
Thanks for the review, the photos are excellent!
The photos are beautiful, the bokeh is interesting, but for modern CZK it will be soapy, soft or something.
I will sell the lens URAN-27 6000 rubles.
the aerial camera itself 12000 rubles.
bargaining is appropriate!
+8 977 821 21 15 XNUMX
I WILL SELL THE URANIUM 27 AIRCAM CAMERA WITH A LENS FOR 15000
PHONE: 89037707691
NAME: ANATOLY
RIVER STATION
Today I saw this lens at a flea market with a red filter. He held it in his hands and realized that there was no point in bothering. With higher parameters, you can purchase a modern MACRO lens.
Only the price he will also be much higher.
Can anyone share the drawings of the adapter on it under the M42 or the shank A (T2 Mount)
Nothing complicated there. Two details.
1 - a glass with an external thread and an internal diameter by the diameter of the rear lens unit and a length of 34 mm.
2 - a counterpart to 1 with an internal thread, 82 mm in diameter and 37 mm long. At the bottom of this part there is a protruding tail with a small outer diameter of about 43 mm and an M42 thread, otherwise it will not cling to the camera - it will rest. The tail length is not more than 16 mm, it is. with a thread narrower, which is 5 mm long. Look at the photo of the lens from the review and you will understand what it is about.
Thank you very much, everything is clear.
Along the way, a couple of questions, the specified lengths are guaranteed to fit?
And then I would not want to screw up the blanks of which so there are not many in our area.
Inside, in the direction of the lens block from the shank (thread), add a diaphragm or tube inappropriately?
All the same, he has a large default field several times larger than not only the matrix but also the M42 holes will shine on the side walls of the adapter.
Do you have a lens block on your hands? Take the camera, ruler and check. The maximum distance from the rear to the bayonet is not difficult to measure.
Apertures have nowhere to add and no need.
Rodion, thank you for your work.
Tell me, where can I order a focuser on this uranium?
Rodion, and selling a subject at the Astroforum at the price of an excellent autofocus kenon "hundred" 100 / 2.0 USM used - won't the wishlist swell? ;)
In general, the prices for many old lenses are very strange now. Some muddy “alloy of window glass and winged metal” (©: in7sky) sometimes trades at the price of branded autofocus glasses of very high quality, idiocy is just ... I remember, in 2000 I bought an OKP-1-100-1 100 / projector at a flea market 1.8 in excellent condition for 50 (fifty) rubles, for use as a magnifying glass. 50 rubles, Karl! Moreover, the seller had several more different lenses at similar prices. And now: 500, 800, 1000 re for the old scratched glass in the simplest bulk frame, without a bayonet, focuser, diaphragm, scale ... people are really stupid. :(
And you are at the astroforum and write;)
I always fall into a stupor from such posts.
Don't - don't buy.
If you don't understand the price, you don't buy.
Just like that, I imagine the evil people forcing the nasty VMatveevs to take away the last thousand chopped blades from crying hungry kids and give it away, crying and suffering, for “fusing shit with foil in a bulk frame” ...
“Don't - don't buy.
If you don't understand the price, you don't buy. "
You have quoted the eternal motto of usurers and speculators of all times. And the fact that other users of Internet flea markets, looking at such “prodigal” ones (is it not without reason?) - also, like monkeys, raise the prices of old stuff - this is so, little things in life. “The market will decide”, cho. : - \
I can understand the price of Canon 100/2 USM, which is purchased for bucks (see the ruble rate) - but in the secondary market it is still at least 30% cheaper than its original retail price. But I cannot understand the price of a subject, bought by an opportunity from a pensioner on some Moscow “flea” at a reasonable price, and pushed to “true connoisseurs” by a cunning kid ~ ten times more expensive.
Yes, this is just a market with animal laws - whoever got up first - that and sneakers :)
Well, you didn't manage to buy with an opportunity from a hypothetical pensioner - buy from someone who succeeded, but at a higher price (or don't buy at all, the market will still put everything in its place)
"Cloudy" fusion of window glass and winged metal "(©: in7sky)
Neighing :)
This is the first time I see such a characteristic for a lens)
For the sake of interest, I looked at the nomenclature of glass, which was used in the lenses of the usual Uranus series (not thermostable). Indeed - "window" TC and F)))) The most high-tech there is a barite flint, which was opened at the end of 19 - beginning. 20th century. However, this does not mean that the lens is bad. Quite the opposite - given its generally outstanding characteristics, the result achieved by engineers is very curious. It was Uranus that became the most widespread ultra-long-focus lenses of the class 250 / 2.5 (!), 500 / 3.5, 750 / 3.5.
One can only guess and dream about what could have been done by transferring it to more expensive types of glass - lanthanum STK, heavy TBP or STF ... One could well expect at least better correction of field distortions, which would make it possible to make excellent 35/2 lenses for mirrorless cameras (Uran-14 35 / 2.5 on window glass existed for the Leningrad camera, but did not have good performance and did not go into the series for a variety of reasons). Or - it would be possible to increase the relative aperture of the lenses by a stop-and-a-half with a similar level of aberrations.
I will say more, the "Uranus" scheme was implicitly used in cinematographic lenses for 35 mm film, for example, OKS1-35-1 35/2. And no one usually has doubts about the quality of cine lenses (even Soviet ones) - they are usually really good.
In a word, I consider the development of the Uranium optical scheme to be one of the major achievements of the Russian optics industry.
Some strange optical device was lying around for 30 years. I looked and saw the inscription Uranus-27. I put it on Nikon D610 and tried to take a picture. To be honest, I'm very surprised. Now Uranus-27 is my favorite manual, Jupiter 37A moved to second place.
Portrait class.
Honestly, I did not expect this from Uranus. It takes VERY sharp and light (aerial) shots. I got a version of Uranus-27 already modified for Zenith.
The photo shows in what condition it is - I will put it in order. There is a focus ring on the lens (I did not find a second such version on the Internet) - not 100 mm, but 10 cm is written on the lens, which is somehow strange for special equipment.
For vehicles with “P” from 1962, it’s normal. Then, for many lenses, the focus was indicated precisely in centimeters.