Відео

Sorry I don't have the size. If you get a cheap jeweller's screwdriver set (the kind for spectacle screws) you should be good to go. That's literally what I used.

Hi, I addressed this at 8min 38sec into the video. There are some shims that you can add/remove to address the backfocus issue. Good luck! ua-cam.com/video/qMRnqIysGAk/v-deo.htmlsi=apSOZpIa6jFuuPzj&t=518

@@photokalia Thank you very much for the info! I realized only after posting the comment! Thank you!

I figured out it's just a ball. What size do you think it is?

Very sorry but I don’t know the size of the ball bearing. It’s really tiny though. In the millimetre range if I recall correctly.

Oh no really sorry to hear that. That’s an unethical seller though for neglecting to mention the missing blades. Could have been cannibalised to repair another lens?

I don’t remember exactly which size but I just used one of the screwdrivers you’d typically use for tightening screws on spectacles. They usually come in a set so just pick the one that’s closest to the size of the screw head.

Glad it helped even though the video was blurry haha.

Did you ever figure this out? I have the same issue

It's been a while so I'm going from memory here. There is a screw at 1:00 that you need to remove first. After that, you should be able to unscrew the part at 2:38. Perhaps it could be a little stiff if you're doing it for the first time.

photokalia Yes I removed the screw but I've been trying to unscrew the part for an hour and it didn't move at all. Did you use any special tool or technique?

Hi Nico, sorry you are having trouble with this part. I just took my lens out to check as I haven't done this in a while. I was able to unscrew the black part after removing the screw, exactly like the video. There is no special technique. Just apply a firm grip on the lens body and turn the black part counter clockwise. I have two copies of the lens and have used the same technique on both lenses before. If it doesn't work, you might need to invest in a rubber ring (www.amazon.co.uk/Tera-Cowhells-Rubber-Removal-Spanner/dp/B00UJCIE0C) to help you get a better grip to twist the part open. The link I gave you is just a sample that I googled. You might need to shop around for a good deal on them. There is another video by another guy on UA-cam for the Canon 50mm f/1.2 LTM, which is similar in construction. You can see how he uses the tool to open the lens up between 0:40 to 1:02 (ua-cam.com/video/Pw005fjIsHc/v-deo.html). Hope this helps, and let me know how it goes!

Thank you very much, I'll try again!

hi, maybe you've solved your problem by now, but I was at the exact same situation. that Black ring was too Hard but I used a canon eos strap with the ruber against metal to loosen it. it worked perfectly

You will need to take it apart from the rear element. If you look at my video (7:03min onwards), the ball bearing goes under the metal plate held in place by the two bronze coloured brackets. If you don't have that tool I used (lens spanner), you can still unscrew the back if you have something that fits into the two notches (4:42 & 5:01 min in the video) and can produce the rotational pressure to unscrew that piece, but it will be harder without the right tools. My biggest fear even with the right tool was scratching the rear element. That's why even though I hate the blurriness of the video I made, I haven't re-shot it. Maybe I'll re-do it the next time my lens needs a clean :)

+L T Sorry I couldn't figure that part out so I didn't try removing it. I decided to leave it alone since it didn't need lubing anyway.