A ring from Olympus Zuiko 135/2.8

[Lumipan]

Hi, I just got a parts only lens in a usable condition, actually no real problems apart from the front element being scratched, but I doubt it affects the image noticeably. Good thing about that is that I don't have to be careful, it is nice to have a mint 'vintage' lens, but I don't know what I hate more, being too careful or scratching it. So there are advantages in having an already 'ruined' copy.

It had just a bit of fungus on 2 inside elements, which I easily cleaned. I think it is pretty good for 40€...

When disassembling there was a ring in the narrowest tube, which has a dent. I'm wondering what that ring is for, has no threads, just stands inside I think it might have been glued sometime as there is some residue. You can see on the inside it isn't a perfect circle. Reminds me of something that might be there to prevent some reflections or similar... I still didn't fit it back inside as it is kind of hard to fit inside and I'm not sure it is needed

It think it might be CB095100 on the diagram, but not sure...

Thanks

https://elektrotanya.com/PREVIEWS/45612216/23432455/fenykepezogep/olympus/olympus_135mm_f2.8_exploded_parts_diagram.pdf_1.png

 

[r_a_feldman]

There is an exploded parts diagram for this lens at https://elektrotanya.com/olympus_135mm_f2.8_exploded_parts_diagram.pdf/download.html, among other places on the internet.

 

[Flighter]

It looks like a light baffle of some sort, the thicker parts of the ring are positioned top and bottom so roughly following the rectangular shape of the exposed negative. The red spot on the photos below is the top of the lens when mounted on the camera.

It's difficult to tell from the exploded diagram but I think you may be right that it is CB095100, nothing else seems in anyway close to the shape.

 

[Lumipan]

It looks like a light baffle of some sort, the thicker parts of the ring are positioned top and bottom so roughly following the rectangular shape of the exposed negative. The red spot on the photos below is the top of the lens when mounted on the camera. View attachment 338906 View attachment 338907

It's difficult to tell from the exploded diagram but I think you may be right that it is CB095100, nothing else seems in anyway close to the shape.

Thanks, I see now... I'll try to fit it back the way it should be

 

[Flighter]

Looking at the lens from the rear, it seems to sit at the end of the ribbed section of the tube that moves in and out as the focus is adjusted, so about 5mm in from the end of the tube. Good luck.

 

[Lumipan]

I succeeded
Not sure how it affects the image, but I'll trust the engineers, they must have had a reason to put it there...

Thanks

 

[Flighter]

Excellent! A nice lens for €40.