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06-12-2011, 09:25 AM   #1
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Mamiya lens for pentax645d?

I am selling a mamiya 500 mm. 5.6 lens on ebay, and I received a question from someone who is interested in buying the lens. He asked if the mamiya 500 mm lens would attach directly to a pentax 645d, or would he need an adapter?? Does anyone know the answer to this?? It would be greatly appreciated

Thank you

Mark

06-12-2011, 09:53 AM   #2
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Scary buyer. It would need an adapter, if there is one. There would not be any automatic aperture control--stop-down metering. But does the lens stop down with the aperture ring when not mounted?
06-12-2011, 10:01 AM   #3
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scary buyer?
06-12-2011, 10:04 AM   #4
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What do you mean by scary buyer?

06-12-2011, 10:17 AM   #5
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I mean he does not even know about the mount on his $10K camera and requires you to do the leg work. I have had a few buyer refuse to complete a transaction because of mistakes they have made. Make it clear that if they win the bid, they pay for the item and compatibility issues with their camera are their problem.
06-12-2011, 10:33 AM   #6
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thanks, good advice
06-12-2011, 10:36 AM   #7
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would metering be a problem with a mamiya lens mounted on the pentax 645 d?
06-12-2011, 11:05 AM   #8
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I don't believe there is an adapter for Mamiya 645 to Pentax 645. If there was, infinity focus would be an issue because of flange distances. I believe there is a thread on this issue at photo.net.

Bottom line, its unlikely to be able to be mounted on the 645D and if it could be, function would be crippled.

06-12-2011, 11:21 AM   #9
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I think Halco is right, no adapter. Metering could be done in manual and aperture priority--this is how 67 lenses work on the 645D.
06-12-2011, 12:45 PM   #10
D W
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QuoteOriginally posted by Yamanobori Quote
I mean he does not even know about the mount on his $10K camera and requires you to do the leg work. I have had a few buyer refuse to complete a transaction because of mistakes they have made. Make it clear that if they win the bid, they pay for the item and compatibility issues with their camera are their problem.
For $10,000 I am sure someone will make it fit and work; whether it is the 500/5.6APO Mamiya or the 150-500 Sigma.

Last edited by D W; 06-12-2011 at 12:51 PM.
06-12-2011, 08:58 PM   #11
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QuoteOriginally posted by D W Quote
I am sure someone will make it fit and work; whether it is the 500/5.6APO Mamiya or the 150-500 Sigma.
the sigma 150-500mm is a 35mm lens and would be essentially useless on a 645D. The mamiya 645 uses a flange that is substantially shorter* then the pentax 645's and it would require some alteration of the focus travel on the mamiya lens in order to get it to focus at infinity on the pentax. Adapting a lens designed for a shorter flange to a longer flange distance requires some expensive tools and it is highly probable the alterations will involve damaging the lens, rendering it useless on the system it was designed for. I know people who get really bent out of shape when anyone alters a pentax K mount lens to fit other systems, because it does involve removal of the aperture leaver and guard.

*mamiya 645= 63.3mm, Pentax 645= 70.87mm
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