Someone has to be able to help with this antique Canon R-set 300mm

[LArifleMAN]

I have found next to zero information on this particular lens. The 400mm version is currently on ebay, but I haven't seen any other examples of the 300. Add to that the portion that attaches the bellows to the mount is missing. I mean, I only paid $40 for this behemoth but I'd still like to clean it and try it out. Any help would be greatly appreciated.

[wq9nsc]

You will find it pictured in the Canon global lens museum:  https://global.canon/en/c-museum/product/r86.html

Rodger

[LArifleMAN]

Thanks Roger, that's about all I've really found.

[MikeSowsun]

Pacific Rim Camera has some information in PDF form about the Canon Canonflex RM camera and it's R mount lenses.

Canon Canonflex lenses 

Canon 300/4 R 

Pacific Rim Camera Canon Canonflex RM Reference Library 

It looks like you are missing the "Lens Intermediate Tube" and the thumb screw to clamp it to the Lens Supporter.

[LArifleMAN]

Yes alright! Now that's some information I hadn't seen. Now I just need to find "intermediate tube R" I can imagine that's probably a needle in a haystack.

Thanks a bunch Mike.

[wq9nsc]

It looks like you have the critical pieces because all bellows R has to do is block the light without getting into the optical path, the complex mechanical parts are there and bellows R was probably discarded earlier due to damage.  I suspect you could pretty easily fabricate that piece out of a variety of materials if you are determined to use this lens.

Rodger

[LArifleMAN]

Oh I am determined. It may end up having terrible IQ but at least I tried.

[ebiggs1]

" ... I'd still like to clean it and try it out."

I'm not much help but you aren't going to be able the clean that out. 

[FrankBarrett]

Just bought one via auction and amd also looking to learn more. It fits Canonflexes, the FT-QL, and Pellix. Thanks for the info.