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Canon R-set 300mm f/4.5
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PostPosted: Wed Nov 18, 2020 2:57 am    Post subject: Canon R-set 300mm f/4.5 Reply with quote

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.





PostPosted: Wed Nov 18, 2020 12:26 pm    Post subject: Reply with quote

Wow, amazing score. Says f4 on the barrel there.
That whitening looks horribly reminiscent of the glass deterioration that afflicts older generic "anybrand" 400mm f6.3's - no remedy. But you won't know until you have the glass out and try to clean it...

PostPosted: Wed Nov 18, 2020 2:47 pm    Post subject: Reply with quote

Not a lot but heres Canons information:


PostPosted: Wed Nov 18, 2020 3:05 pm    Post subject: Reply with quote

Certainly a rare and interesting find! If one lens has lost its transperence, a re-polishing with cerium oxide might be an option, but I'm not an expert on that. It might be useful to contact an optical enterprise and ask whether they could re-polish a single lens.

Apart from that, the corresponding 5.6/600mm Canon R lens (https://global.canon/en/c-museum/product/r88.html) was sold in local auction here in Switzerland, a few months ago. It went up to about CHF 800 (USD 900), but it was in pristine condition.