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mpaskowski · 06-12-2011, 09:25 AM

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

Yamanobori · 06-12-2011, 09:53 AM

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?

mpaskowski · 06-12-2011, 10:01 AM

scary buyer?

mpaskowski · 06-12-2011, 10:04 AM

What do you mean by scary buyer?

Yamanobori · 06-12-2011, 10:17 AM

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.

mpaskowski · 06-12-2011, 10:33 AM

thanks, good advice

mpaskowski · 06-12-2011, 10:36 AM

would metering be a problem with a mamiya lens mounted on the pentax 645 d?

Halco · 06-12-2011, 11:05 AM

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.

Yamanobori · 06-12-2011, 11:21 AM

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.

D W · 06-12-2011, 12:45 PM

Originally posted by Yamanobori

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.

**Digitalis** · 06-12-2011, 08:58 PM

Originally posted by D W

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

06-12-2011, 09:25 AM	#1
mpaskowski New Member Join Date: Jun 2011 Posts: 5	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, 12:45 PM	#10
D W Veteran Member Join Date: Mar 2008 Location: Hogtown, ON, Canada Posts: 329	Originally posted by Yamanobori 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.

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06-12-2011, 09:53 AM	#2
Yamanobori Veteran Member Join Date: Feb 2011 Photos: Gallery Posts: 573	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
mpaskowski New Member Join Date: Jun 2011 Posts: 5 Original Poster	scary buyer?

06-12-2011, 10:04 AM	#4
mpaskowski New Member Join Date: Jun 2011 Posts: 5 Original Poster	What do you mean by scary buyer?

06-12-2011, 10:17 AM	#5
Yamanobori Veteran Member Join Date: Feb 2011 Photos: Gallery Posts: 573	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
mpaskowski New Member Join Date: Jun 2011 Posts: 5 Original Poster	thanks, good advice

06-12-2011, 10:36 AM	#7
mpaskowski New Member Join Date: Jun 2011 Posts: 5 Original Poster	would metering be a problem with a mamiya lens mounted on the pentax 645 d?

06-12-2011, 11:05 AM	#8
Halco Senior Member Join Date: Aug 2009 Posts: 128	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
Yamanobori Veteran Member Join Date: Feb 2011 Photos: Gallery Posts: 573	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, 08:58 PM	#11
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,695	Originally posted by D W 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

Mamiya lens for pentax645d?

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