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12-20-2017, 04:46 PM - 1 Like   #16
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QuoteOriginally posted by Not a Number Quote
Here's one with the M42 mount:
TAKUMAR 500mm F/4.5 TELEPHOTO LENS FOR M42 MOUNT 35mm FILM SLRs | eBay

Interesting as it has a simple notched "gunsight" on it.
They all have a sighting aid.

Here’s one for $200 with a bit of fungus. Might be worth it just for the mount.

ASAHI PENTAX 500mm F4.5 TAKUMAR TELEPHOTO LENS PENTAX M42 SCREW MOUNT AS-IS | eBay

12-20-2017, 07:03 PM   #17
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If the OP was kind of handy, they could find a sort of long Sony A mount extension tube, cut off the end and find a way to make that into the missing mount tube. The lens with fungus could be a useful template for that project, and resold afterwards.
12-20-2017, 08:04 PM   #18
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QuoteOriginally posted by UncleVanya Quote
The mount is also interchangable from m42 to K - these lenses occasionally are separated from this part which is virtually impossible to find. Someone will have to make a part to replace it. 3D printing might work since the lens isn't going to be held up by the camera body with that massive thing! Alternately someone can machine one or cobble one from other available parts. If I were the owner I'd skip the k adapter and make a direct to Sony adapter at this point.
I think so, i have to ask somebody to make the tube...thanks
12-20-2017, 10:04 PM   #19
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Thanks all for your advice and comment. I try to find an expert to make the missing part.

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