According provided by Super-Takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in Japan many thanks https://vk.com/lphotovideolwhere similar manual optics are on sale.
Super-Takumar 1: 1.4 / 50 Lens Asahi Opt. Co. Lens made in Japan. The lens is shown on a digital SLR camera. Canon EOS Digital Rebel XSi. Attaching the lens to the camera using M42-Canon EOS adapter without chip.
In short
Super-Takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in Japan is an old classic 1-aperture lens. Such Takumars have a rather pleasant picture at open aperture. In general, Super-Takumar 1.4: 50 / XNUMX is of little use due to the very strong yellow cast in photographs. The coating of the optics has most likely turned yellow over time, which does not allow you to easily and quickly obtain the desired or even pleasant color from this lens.
Important:
- There is a lot of information about its radioactivity (the reason for this is thorium enlightenment).
- Not all Super-Takumar 1: 1.4 / 50 lenses eerily paint a picture in yellow / green (warm) color. Rumor has it that yellowing depends on age.
- Perhaps not all Super-Takumar 1: 1.4 / 50 lenses are radioactive, but only those that were released after 1967.
- Automatic white balance copes well with yellowness, but using preset values white balance (daylight, shadow, etc.) make the picture look awful. Shooting with auto white balance in mixed lighting conditions also gives poor results. Optical coating should not shift the color, but what the yellow Super-Takumar 1: 1.4 / 50 does is clearly shown in this photo.
- Some craftsmen are somehow trying to fight yellowness. Look for information on the net, leave useful links in the comments.
- The level of radiation, most likely (!), Nothing bad can do to its owner. Bad can only happen if you wear Super-Takumar 1: 1.4 / 50 as a pendant a year or two.
- Real aperture Takumar 1: 1.4 / 50, expressed in T-stops, is much lower than the T / 1.4 value.
There is a small 'family' of Takumar 1: 1.4 / 50 lenses of which four main models can be distinguished: Super-Takumar with 8 lenses, Super-Takumar with 7 lenses (from this review), Super-Multi-Coated Takumar and S.M.C. Takumar. In parallel with the Takumar 1: 1.4 / 50 line, more lines were produced Takumar 1: 1.8 / 55 и Takumar 1: 2 / 55.
The main differences from other models of the Super-Takumar 1: 1.4 / 50 series with a 7/6 scheme
- In the name after 'Asahi Opt. Co.' no comma. Do subversion '37802' there is a comma: 'Asahi Opt. Co.,'
- On the aperture control ring, the number '2.0' is used for the F / 2 value. Do subversion '37801' uses a white dot instead of a number.
- The aperture ring mode switch is abbreviated 'M' and 'A'. Do subversion '37801' the inscriptions 'MAN' and 'AUTO' are used
- There is a '37800' model marker on the aperture ring operation mode switch. Do subversion '37801' has the inscription '37801'.
- There is no 'LENS MADE IN JAPAN' inscription on the back of the lens. Do subversion '37802' there is such an inscription.
- Only 1 aperture control pin on the bayonet side. Do subversion '37802'There are three aperture control pins/lugs.
All major versions of similar lenses Asahi Opt. Co., Takumar / Pentax:
1.2/50
- SMC PENTAX 1: 1.2 / 50 ASAHI OPT. CO., JAPAN (7/6, 20947, 1975-1984)
- SMC PENTAX 1:1.2/50 ASAHI OPT. CO.,JAPAN'GOLD' (7/6, 1981)
- SMC PENTAX-A 1: 1.2 50mm (7/6, 20987, 1984-2004)
- SMC PENTAX-A 1: 1.2 50mm Special (7/6, 2000)
1.4 / 50 (video)
- Super takumar 1: 1.4 / 50 Asahi Opt. Co., Lens made in Japan (8/6, 358, 1964-1966)
- Super takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in japan (7/6, 37800, 1965-1971, F/2 in number)
- Super takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in japan (7/6, 37801, 1965-1971, F/2 dot)
- Super takumar 1: 1.4 / 50 Asahi Opt. Co., Lens made in Japan (7/6, 37802, 1965-1971, comma after 'CO.')
- Super-Multi Coated TAKUMAR 1: 1.4 / 50 ASAHI OPT. CO., JAPAN (7/6, 37902, 1971-1972)
- SMC TAKUMAR 1: 1.4 / 50 ASAHI OPT. CO., JAPAN (7/6, 37908, 1972-1975)
- SMC PENTAX 1: 1.4 / 50 ASAHI OPT. CO., JAPAN (7/6, 20847, 1975-1977)
- SMC PENTAX-M 1: 1.4 50mm ASAHI OPT. CO., JAPAN (7/6, 20867, 1977-1984)
- SMC PENTAX-A 1: 1.4 50mm (7/6, 20887, 1984-1989)
- SMC PENTAX-F 1: 1.4 50mm (7/6, 20827, 1987-1991)
- SMC PENTAX-FA 1: 1.4 50mm (7/6, 20817, 1991-2023)
- HD PENTAX-D FA * 1: 1.4 50mm SDMAW (15/9, 21260, 2018->)
- SMC PENTAX-FA 1: 1.4 50mm Classic (7/6, 2023->)
- HD PENTAX-FA 1: 1.4 50mm (7/6, 2023->)
1.8 / 55 (video)
- takumar 1:1.8 f=55mm Asahi OPT. CO., Japan (6/5, 1958, zebra)
- Auto-takumar 1:1.8 f=55mm Asahi OPT. CO., Japan (6/5, 1958-1960, zebra)
- Auto-takumar 1:1.8/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1960, with 'R')
- Auto-takumar 1:1.8/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1960-1962, no 'R', oblique lines of the depth of field)
- Auto-takumar 1:1.8/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1962, no 'R', straight lines of depth of field)
- Super takumar 1: 1.8 / 55 Asahi Opt. Co., Lens made in Japan (6/5, 1962, fine ribs, f/1.8 left)
- Super takumar 1: 1.8 / 55 Asahi Opt. Co., Lens made in Japan (6/5, before 1965, fine ribs, f/1.8 right)
- Super takumar 1: 1.8 / 55 Asahi Opt. Co. Lens made in japan (6/5, 37106, before 1971, large ribs)
- Super-Multi Coated TAKUMAR 1: 1.8 / 55 ASAHI OPT. CO., JAPAN (6/5, 37104, 1971-1972)
- SMC TAKUMAR 1: 1.8 / 55 ASAHI OPT. CO., JAPAN (6/5, 37108, 1972-1975)
- SMC PENTAX 1: 1.8 / 55 ASAHI OPT. CO., JAPAN (6/5, 20747, 1975-1977)
2 / 55 (1.9 / 55)
- Auto-takumar 1:1.9 f=55mm Asahi Opt. Co.,Japan (6/5, 1958-1959)
- Auto-takumar 1: 2 f = 55mm Asahi Opt. Co., Japan (6/5, 1958-1959, zebra)
- Auto-takumar 1: 2 f = 55mm Asahi Opt. Co., Japan (6/5, 34100, 1958-1959)
- Super takumar 1: 2 / 55 Asahi Opt. Co., Lens made in Japan (6/5, small fins, F/2 left)
- Super takumar 1: 2 / 55 Asahi Opt. Co., Lens made in Japan (6/5, small ribs, F/2 on the right)
- Super takumar 1: 2 / 55 Asahi Opt. Co. Lens made in japan (6/5, 37103, 1962-1973, large ribs)
- Super takumar 1: 2 / 55 Asahi Opt. Co. Lens made in japan (6/5, 37107, additional aperture pins)
- SMC TAKUMAR 1: 2 / 55 ASAHI OPT. CO., JAPAN (6/5, 37109, 1973-1975)
- SMC PENTAX 1: 2 55mm ASAHI OPT. CO., JAPAN (6/5, 1976-1977)
1.7/50
- SMC PENTAX-M 1: 1.7 50mm ASAHI OPT. CO., JAPAN (6/5, 20877, 1977-1984)
- SMC PENTAX-A 1: 1.7 50mm (6/5, 20897, 1984-1989)
- SMC PENTAX-F 1: 1.7 50mm (6/5, 20837, 1987-1991)
- SMC PENTAX-FA 1: 1.7 50mm (6/5, 20907, 1991-2004)
2/50
- SMC PENTAX-M 1:2 50mm ASAHI OPTICAL CO. (5/5, 20677, 1979-1985)
- SMC PENTAX-A 1: 2 50mm (5/5, 20697, 1985-1998)
2.2/55
- takumar 1:2.2/55 Asahi Opt. CO., Japan (6/5, 1961-1963)
- Auto-takumar 1:2.2/55 ASAHI OPT. CO., Lens made in Japan (6/5, 1961-1963)
2/58
- takumar 1:2 f=58mm Asahi Opt. Co., Japan (6/4, 1957-1958)
- takumar 1: 2 f = 58mm Asahi Opt. Co., Japan (6/4, 1957-1958, labeled 'R')
DA (APS-C: 1.4/55 DA* + 1.8/50 DA)
- SMC PENTAX-DA * 1: 1.4 55mm SDM (9/8, 21790, 2008->)
- SMC PENTAX-DA 1: 1.8 50mm (6/5, 22177, 2012->)
Asahi-Kogaku (M37x1, 3.5/50 + 2.4/58 -> M42)
- takumar 1: 3,5 f = 50mm Asahi-kogaku (4/3, 1952, M37×1)
- takumar 1: 3.5 f = 50mm Asahi-kogaku (4/3, 1952, , M37×1, pre-set)
- takumar 1: 2.4 f = 58mm Asahi-kogaku (5/3, 1954, M37×1, silver)
- takumar 1: 2.4 f = 58mm Asahi Opt. Co., Japan (5/3, 1957-1958, M42)
The lens names in this list correspond exactly to the lens name label on the lens barrel (except for the serial number and/or filter diameter).
Super-Takumar 1: 1.4 / 50 Lens Asahi Opt. Co. Lens made in Japan. The lens is shown on a digital SLR camera. Canon EOS Digital Rebel XSi. Attaching the lens to the camera using M42-Canon EOS adapter without chip.
Main technical specifications Super-Takumar 1: 1.4 / 50 Asahi Opt. Co .:
| Review Instance Name | Super-Takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in Japan 2197367 (lettering on switch '37800') |
| Basic properties |
|
| Front Filter Diameter | 49 mm, metal thread for filters. |
| Focal length | 50 mm
|
| Zoom ratio | 1 x |
| Designed by | for film cameras with a frame size of 24 x 36 |
| Number of aperture blades | 6 petals. At F / 2, the diaphragm blades form an opening with small notches. |
| Tags | focus distance scale in meters and feet. The depth of field scale for F / 4, 8, 11 (not explicitly), 16. Label for working in the infrared spectrum. |
| Diaphragm | from f / 1.4 to f / 16. The lens has an aperture control ring. There are marks on the ring for F / 1.4, 2, 2.8, 4, 5.6, 8, 11, 16. You can set one additional value between each pair of numbers (except between F / 1.4 and F / 2, as well as between F / 11 and F / 16). The aperture ring has an M / A switch (automatic aperture only works on the respective cameras). |
| MDF | 0.45 m, |
| The weight | 230 g (approximately) |
| Optical design | 7 elements in 6 groups.
The lens does not use special optical elements in its optical design. The same optical scheme is used by many other lenses. |
| Lens hood | Threaded, screwed into the front filter thread |
| Manufacturer country | LENS MADE IN JAPAN (lens made in Japan). |
| Period | From 1965 to 1971. Later it was replaced by the version of Super-Multi-Coated Takumar 1: 1.4 / 50 |
| Price | About 80 cu for used option.
Prices for modern Pentax lenses can be viewed here. |
Super-Takumar 1: 1.4 / 50 is well assembled. The focus ring has no rubberized inserts, rotates approximately 180 degrees. The ring travel is smooth and pleasant. During focusing, the front retractable body does not rotate. Focusing occurs by moving the entire lens block.
Below is a detailed view of the lens to accurately identify its version and version.
Sample photos on Super-Takumar 1: 1.4 / 50:
At F / 1.4, it is only satisfactory in the center of the frame, the lens becomes quite sharp in the center of the frame at F / 2. At F / 2.8, sharpness is noticeably increased. In terms of sharpness, the lens is similar to many other fifty dollars. The key feature, I think, is the yellow tint, which creates the enlightenment of this lens, as well as a pleasant, Planar image.
Important: real aperture the lens expressed in T-stops is much lower than T / 1.4. Comparing Super-Takumar 1: 1.4 / 50 with Orthodox Carl Zeiss Planar 1,4 / 50 ZE T *, it turns out that Super-Takumar 1: 1.4 / 50 is darker Carl Zeiss Planar 1,4 / 50 ZE T * more than one step. Under the same shooting conditions Super-Takumar 1: 1.4 / 50 requires a shutter speed of 1.4/1 s at F / 100, at the same time Carl Zeiss Planar 1,4 / 50 ZE T * It takes only 1/250 seconds (the difference is 2.5 times). Real aperture Super-Takumar 1: 1.4 / 50 is between F / 2 and F / 2.5. Most likely, the low values of the number T are associated with yellowed (darkened) enlightenment and loss of light flux during transitions between lenses.
Pictures in the gallery were obtained using Canon EOS Digital Rebel Xsi и adapter M42-Canon EF. Photo without processing, on-camera JPEG.
Download source files in format JPEG can at this link.
Carl Zeiss Planar 1,4 / 50 ZE T * and Super-Takumar 1: 1.4 / 50 Asahi Opt. Co. Lens made in japan
How to use with modern cameras?
Lenses with mounting thread M42 (M42 X 1 / 45.5), such as the lens from this review, are very easy to use on almost any modern digital camera (both SLR and mirrorless), for this it is enough to choose the right adapter (adapter). You do not need to carry out any additional steps to modify the lens.
The cheapest adapters can be found at Aliexpress.com... There are adapters (adapters) with a chip that provide more convenience during shooting, usually chips are used to confirm focus and / or metering exposure, and form the correct EXIF. The chip does not affect the image quality in any way.
For some SLR cameras (for example, with the Nikon F-mount), you need to use adapters with a corrective lens, which allows you to focus correctly at all focusing distances. For any mirrorless cameras, such a lens is not needed, and the adapter is a simple decorated hollow metal tube with an appropriate mount.
For SLR cameras
- Canon: For cameras Canon EOS with bayonet mount EF / EF-S need an M42-Canon EOS adapter, such an adapter with a chip can be found herewithout chip here.
- NIKON: For cameras Nikon DX / FXas well as for cameras Fujifilm и Kodak with a Nikon F mount, you need an M42-Nikon F adapter, you can buy such an adapter without a lens and a chip here, with a lens without a chip herewith chip without lens here, with lens and chip here. Why a lens? Why chip?
- PENTAX: For Pentax cameras with K mount, you need an M42-Pentax K adapter, you can buy such an adapter here.
- SONY/MINOLTA: For cameras with a Sony / Minolta A mount, you need the M42-Sony A adapter, you can find such an adapter without a chip at this linkwith a chip at this link.
- OLYMPUS/PANASONIC/LEICA: For cameras with a 4/3 bayonet mount (not to be confused with Micro 4/3!) You need an M42-4 / 3 adapter, you can buy such an adapter here.
For mirrorless cameras
- SONY: For cameras with 'E'/'FE' mount series SonyNEX и Sony Alpha you need an adapter M42-Sony E (aka M42-Sony Nex), you can find it at this link. An autofocus adapter is also available for these cameras. Techart PRO Leica M - Sony E Autofocus Adapterwhich can be found at this link.
- OLYMPUS / PANASONIC / KODAK / XIAOMI: For cameras with a bayonet mount Micro 4/3 (Micro 4:3) you need an adapter M42-Micro 4/3, you can find it at this link.
- CANON M: For cameras with Canon EF-M mount need adapter M42-Canon M, it can be found at this link.
- CANON R and RF-S: For cameras with Canon RF mount need adapter M42-Canon R, it can be found at this link.
- Nikon 1: For cameras Nikon 1 Series need adapter M42-Nikon 1, you can find it at this link.
- Nikon Z: For cameras Nikon Z series (FX/DX) need an adapter M42-Nikon Z, it can be found at this link.
- FUJIFILM X: For cameras with mount X need an M42-Fuji X adapter, you can find it at this link.
- FUJIFILM GFX: For medium format cameras G-mount need M42-Fuji GFX adapter, you can find it at this link.
- SAMSUNG: For cameras with NX mount, you need an M42-Samsung NX adapter, you can find it at this link. There are no adapters for the NX mini camera yet.
- PENTAX: For Q-mount cameras, you need an M42-Pentax Q adapter, you can find it at this link.
- SIGMA / PANASONIC / LEICA: For cameras with L mount you need an M42-Leica L adapter, you can find it at this link.
- LEICA: For cameras with a bayonet mount Leica M need adapter M42-L / M, you can find it at this link.
If you have any questions on compatibility and adapters - ask in the comments (comments do not require any registration at all).
Super-Takumar 1 Lens Sizes: 1.4 / 50 Asahi Opt. Co. Lens made in japan and Carl Zeiss Planar 1,4 / 50 ZE T * и YASHICA JAPAN AUTO YASHINON-DS 50mm 1: 1.9 и RIKENON P 1: 2 50mm RICOH
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Material prepared Arkady Shapoval.
I have a super-multi-coated Takumar 1,4 50 mm, I read on the net that the yellowing of the enlightenment is “cured” under ultra-violet light. It will be necessary to try it somehow)) I did not get up on Canon due to the fact that the adapter rests on the diaphragm leash and clamps it, not even allowing the adapter to completely screw in. Even if the lens has phonitics, there are three types of radioactive radiation, alpha radiation, beta radiation and gamma radiation, and so Takumar does not fonit in the gamma spectrum, this is the X-ray range, and its radiation in the alpha or beta range is blocked by human skin or a paper sheet ( physics). I use Sony A100. I remove the “warmth” of enlightenment by adjusting the temperature in Kelvin. In general, an interesting lens. On the open softit, even stronger than Helios 44 series. The ease of handling is also lower than that of Helios.
Super Takumar can be cured of unwanted yellowness by simply exposing its lenses to sunlight, but it is not for long, let's say a "symptomatic" treatment.
It didn’t help me.
Yeah, they always admired such posts from excellent students in physics.
In general, everything is said correctly, but with the terms (“and so Takumar does not fonit in the gamma spectrum, this is the X-ray range”), you need to be more careful.
Thorium in takumar lenses is phonite with alpha particles. Yes, their mileage is minimal - they linger easily and naturally.
I measured the background of the detector in the Academgorodok of NSU. It is felt by the device only directly near the lenses.
Yes, but nevertheless, this background is the basis for confiscation of the lens at customs if you bought it on ebay for example. and in fact, Alpha particles are retained by the camera and the top layer of the skin a little more than completely)
Are there real cases to delay?
About this lens with thorium glass (namely glass, and not enlightenment), the lenses are quite competent comrade in his video, applying dosimeters to the rear lens of this lens and measuring different types of radiation, tells why these glasses were replaced with lanthanum, for which customs officers like them, about likelihood of cataracts and harm from storage.
About the lens and thorium glasses https://www.youtube.com/watch?v=1p68s8BBf7U
I never understood why people buy these takumars, as for me it's bullshit, the color pattern and even the sharpness is no better than the same penny helios of the 44s, but it costs "dear mother". If you really want aperture with normal image quality, it is better to buy an old zuiko 50 1.4 or fd 50 1.4 or the same nikkor 50 1.4 old at the same price .. but this is not a miracle of the Japanese optical industry.
Zuiko - fabulous, cute, beautiful and functional :). I have a review of this here Olympus Om-System Zuiko MC Auto-S 1: 1.4 f = 50mm
The drawing is just quite interesting, but because of the wretched T-stop (F / 2.2, if compared with Helios-44 MS) and low sharpness with an open application, I consider it generally doubtful.
All these soviet shortcomings didn’t stand next to Takumar, I have more than ten Soviet about fifty dollars, 6 of helios, they lose in everything, details, color contrast and micro-contrast, sharpness at the corners is just hellishly miserable. I have an SMC version of Takumar, the last one is yellowness.
You looked in the wrong place, wrong and wrong. I have a K 55 / 1.8 in a new state (Mint), 1977. Prior to that, Nikkor 10 / 50 Ai-s was 1.4 years old. Before him there was Nikkor AF 50 / 1.4 (not D, Japan). Comparing Nikkor to this 55 mm is like comparing a 1977 Zhiguli to a BMW of the same year. In Nikkor's open picture, the picture is garbage, veil and haze, in this 55 mm by 1.8 sharpness and purity are uncompromising! This glass is of the Leica class or the 77th lima. 55 is better than Canon 50L and decently better. The glass contains lanthanum and has an amber brown hue. The Pentax has better mechanics, a cut higher build quality. The examples in the review are only worthy of a trash can!
Good afternoon, Arkady!)
Wildly sorry for the offtopic, but I need your advice! I want to buy a Soviet manual portrait lens for my Nikon D3000. The choice fell on the MC Granite-11N F4,5 80-200mm and Arsat H 1: 2 50mm. I read your reviews on them, from cover to cover, but still I can not finally make a choice. Thanks in advance for your reply.
MS Helios-81H, aka ARSAT 50/2.
Phonite is not enlightenment; thorium is part of glass; glass is fonit!
+1 That's right.
Thanks for the review! Taki Zeiss will be more interesting!
Thanks for the review! The question is not quite on the topic, please advise the manual old 25-35mm lens not very dark, which will become 35mm, thanks!
https://radojuva.com/2011/09/obzor-ms-mir-24-n/
Thanks. Preferably not Soviet
Takumar 35/2
Thank you!
I want this myself. It used to be expensive, but now it looked at eBay and was completely upset.
I looked at the photos taken by him, I liked it. Looked at ebay - wow! $ 120 is a little expensive, but what about $ 35 3.5?
So he is miserable, you yourself estimate - 35 / 3.5! It's a keyhole, not glass. Even Mir-1 white Zagorsky is much more interesting. Why such a craving for Japanese nameplates in general - I don't understand. I do not believe that this takumar in sharpness will be at least somewhat seriously different from Mir-1 on equal terms.
It was not for nothing that Mir-1 received the Grand Prix in its time, it was indeed one of the best shiriks. But Mir-1B has tarnished the reputation of this series of lenses, alas ...
So you can actually look for a good Mir-1.
If you need something much better, pay attention to the 35 / 2.4. It's just quality.
ps with tautology it amusingly comes out for me, yeah.
I remember a year ago you, Rodion, said that Zeiss is a waste of money, and brand fees.
Yes, if you take something like Planar 50 / 1.7 C / Y.
Flektogon 35 / 2.4 is really a very decent lens.
And where did Mir1 get ripped off if not a secret ?!
Takumar 35/2 steps on the same rake as 50 / 1.4. Formally, it is 1: 2, and according to T-stops it will be, as it were, not 1: 3.5. The picture, like 50 / 1.4, is very nice, but the color rendering and real aperture are extremely poor.
If you take it - for the sake of artistic qualities. When looking for 35/2 for F / 2, it's better to take anything other than takumar.
Friends join a group where you can buy similar manual optics and photographic equipment.
https://vk.com/oldlens
Yellowing of enlightenment is “cured” under
395 nm ultraviolet light in 10-12 hours.
Image quality is changing dramatically.
I confirm. I used a UV LED lamp (three 1 W LEDs each), shone the first couple of days in the rear lens by putting it on the foil, then took the second lamp and began to shine front and back. For greater reliability shone a week. the yellowness is gone.
There was also a problem with the fungus - "cobweb". It was easily removed by soaking for a couple of minutes in a mixture of 3% hydrogen peroxide and ammonia in a 1: 1 ratio.
I also confirm. I ordered a 5W USB powered lamp on Ali, followed the same instructions. On the very first day, yellowness / orangishness almost disappeared (a small spot remained on ~ 30% of the area), on the second day it passed completely. Glass is not completely transparent, a light shade of yellowness is all the same, but not as terrifying as before. For reliability, I changed the side where the lamp shone every 12 hours, and also put foil on it. There is no difference in transparency and color between the 2nd and 4th days. I think it’s enough to shine for two, two and a half days.
it's not yours - portraits of women - no need, take pictures of flowers and cats
Female portraits - do you mean a model with a beard or legs with eyes?
And maybe even the 18th photo.
portraits are better to look here https://500px.com/p/ArkadiiShapoval/galleries/people-8
Hello, I have such a lens as in the article. But when you install it through an adapter with a chip on the Olympus E-520, the diaphragm pin remains unpressed, i.e. you can only shoot with the aperture fully open. Same with the other Yashica 50mm 1: 1.9 yashinon ds lens described here. What's wrong?