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Is it a good lense? Saw one on ebay really cheap.

The shiny one will produce image hot-spot just because reflected light from camera sensor to adapter then back few times.

0:39 seaaaaarchiiiing.. SEEK AND DESTROY

Why do you cover the serial number of the lenses? Its not like its a state secret or anything. Its a 30+ year old lens.

this video was extremely helpful. i bought this lens on ebay and it came in with the grease completely dried and more similar to glue than grease. i was able to get it into fully functioning shape with help from this vid (the assembly is different to other lenses i've taken apart)!

Is it safe to dismantle this lens for cleaning? Just acquired one with lots of fungus inside.

It is the minolta MC W ROKKOR-X f2.5 28mm lens that has a thorium element.

Jena handke fringing slightly better

Can you test Canon FD 50mm f/1.4 S.S.C

What about the 1.4?

I've fixed a few sticky irises, but this one would have defeated me without this video. Thank you FR.

Kiron 80-200 с виду идентичный. А по сборке, они одинаковые? Спасибо.

Thank you for the test. My Takumar 50/f1.4 and Takumar 55/f1.8 are both radioactivated, the 1.4 being yellowed heavily such that it is visible as soon you remove the lens cap. I choose however not to treat them. I have several other 55&55 lenses and it is okay to keep the charm of these lenses.

can you also show how to disassemble the middle elements?

I have this lens in the PK mount version. It's easily one of my favorite zoom lenses. Thanks for the video!

Just bought a pentax Spotmatic f with this lens. Model number is 7426944. Im guessing all copies of the SMC TAKUMAR 55mm F1.8 from the late 60s/early 70s aren't radioactive?

The SMC is better built but for IC the Jena is the winner here.

Thanks for posting. I mostly guessed right. Mostly preferred the MIJ lens images.

Body canon lock to lens 😢😢 why open ? 😭😭

Wait, so do lenses emit gamma radiation??

Thanks for making this video. It would be really helpful, if only I could reach the screws. My focussing helicoid is stuck fast, like this one. However, the aperture index ring is not split, like this one, and I don't want to have to break it. Do you have any other suggestions? Cheers

Another good demonstration! Thanks for posting. Bummer that it stopped working again. Was it a crappy lens to begin with?

Excellent work, as usual 👍🏻. I also do the trick of making the ball bearing disappear, the problem is that I still haven't learned how to make it reappear 🤷🏻‍♂️

why the dreadfull music.

I'm impressed you were able to re attach the aperture assembly while installing that little screw/spring assembly. I had trouble doing that since the 4 mount screws were stuck with loctite. I had to unlatch the spring and re attach it afterwards. You make great videos btw!

one would expect the f2 to have a slightly smoother bokeh wide open because it cuts off some of the ringing on the edge of the bokeh ball

I have an olympus om system f zuiko auto s 1:1.8 50mm serial number: 1644543. Is it radioactive?

Is there a version of this lens without the front barrel screws visible? My lens is fine on focusing but i can't see the screws at all, not even a hint of them.

Спасибо за ролик!

Hi there. I recently picked up a used vivitar 90mm f2.5 macro lens. The aperature blades do not appear at all when i turn the aperature ring. I saw u had a video for an elicar 90mm macro for canon mount. The lens i got was a nikon f mount. Any idea on how to go about disassembly to fix it? I cant find anything online😢

Thanks

Another great video! I have an Olympus bellows and just may need to know how to do this job. Thank you again for sharing your knowledge!!!

Thank you - I got the K-Mount version because I was looking for a Tessar type lens and zhis macro performs significantly better than the Jena T 50/2.8. Would be interestion to know whether radioactivity of the later K-Versiion ist similar to the Takumar

非常有幫助的視頻， 教你如何修復光圈

Thanks for the video. I was able to guess every image right mainly due to the lack of contrast. Helps me decide wether or not to keep this lens I received with the edges slightly fungified.

Just got some fungus covered lenses and took one apart before I figured out I had to mark where the helios screwed in. It's a pentacon and I'm in a bad situation where I'm trying to put the lens back so that it's not too far in or out so that I can calibrate it. At least I know now for the other 5 lenses 😆

Thank you for your video. Setting the infinity focus stop, is exactly whats needs to happen to my lens. Do you know how to set this? Do I need to vile down the stop on the black ring, or is there a more elegant way of doing this?

lighter fluid does a better job

How to open the front lens?

watching you smack the glass together 😭stop itttt

I think I have the exact same adapter. The alignment on mine isn't off by nearly as much, maybe a 30° offset to the left. It also sits quite solidly in the mount. Maybe I got lucky with quality control

I have this lens and am trying to collect the whole DS-M line, but was starting to get a little concerned because of the typical things you hear around groups and stuff. Thank you so much for this video! Still collecting this series now😂

I guessed wrong on two images. Loss of contrast its serious in some cases. Not necessarily a useless lens, especially since the center seems to be good.

Nice effort, however it is much easier to put the whole aperture cartridge into isopropyl alcohol bath and clean the whole thing without blade disassembly. I had done it this way to my 5.5cm f1.8 Yashinon-DX lens, which came attached to my Yashica J-5 vintage camera. The aperture was oily and uncooperating, but it is crispy and snappy now. Just need to make sure to temporarily remove the coil spring from the aperture lever, so you may close the blades to f22 as you let the IPA evaporate. If they dry in fully open position (f1.8), some ugly stains form on blade surfaces. That way the aperture will retain factory look. Whenever you reassemble the aperture blades it is never in their original position, which over time allowed them to develop unique scratch patterns. Once you reassemble the blades they do not look right on their surfaces. Thanks for sharing you valuable work.

Thanks so much, it actually does works!!!!

Very helpful. Thank you!

That was a Great Demonstration of the Ricoh AF RIkenon 50mm F2 . I kept thinking how Amazing there is an Auto Focus system louder the A mount AF lens 😂

How convenient! Saw one of these at a local shop, and a fresh video all about it.

I have both lenses, both are excellent, especially in black and white

Thank you for putting this together! It helped me make a decision.