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06-22-2010, 02:43 AM   #1
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645 pentax to 35mm pentax

I am experimemting with Mamiya 645 to my K10 using a borrowed Mamiya 150mm lens. I want to move on to Pentax 645 lens to the K10.
Have researched this but found little to guide me. Has anyone expeience of using the Pentax 645 to 35mm adapter?
As the pentax lens are more expensive than the Mamiya, I don't want to make an expensive mistake.
Comments, please.

06-22-2010, 07:21 AM   #2
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Hi, this is discussed here: https://www.pentaxforums.com/forums/ask-b-h-photo/105452-super-multi-coated-p...ml#post1084691
(and probably in older posts too)
06-22-2010, 09:23 AM   #3
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There is a Pentax brand 645-K adapter and I believe there are some third party manufacturers for this type of adapter. I can speak to the Pentax brand - it is very nicely made and works as advertised. I have about a dozen 645 lenses and it works with each of them (FA 33-55mm all the way to an FA 400mm). It also works with the Pentax 645 1.4X teleconverter (used it with the FA 400mm). Hard to find the Pentax brand one for under $200 USD though.
06-23-2010, 03:58 PM   #4
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I agree as to the Pentax version. Works as advertised, and solid. Don't know about non-Pentax versions. I am sure, however, that you can still find them. Try Japan Exposures.

06-26-2010, 11:48 AM   #5
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I have the genuine Pentax 645 adapter and it is a finely made adapter of the highest quality. I have several 645 lenses that I use with delight on my K20D. It is pricey...I think I paid around $240 for it. If you can find a cheaper one of some other brand, it would likely work as well, since there is no glass or electrical connections involved. I was unable to find a cheaper version, so I just bought the Pentax.
Regards!

I wanted to add this photo I shot with the 645/Adapter +Tamron 1.4 TC -645 75MM F2.8 lens. For those interested in using 645 lenses on your K20D or K7...or whatever.....I think you will be very happy with the results. The full resolution of this shot was very good, and the 75MM 645 lens can still be found relatively cheap. It is one of my favorite lenses, and is most excellent for Portraits. I have four 645 lenses, some of them have now become expensive...but the 75MM is still affordable and is a nice small lens of excellent quality.
Regards

Last edited by Rupert; 07-10-2010 at 08:39 AM. Reason: Addition....
06-26-2010, 12:52 PM   #6
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I have a original Pentax 645 to K that i'm selling. I bought it new but sold all my Pentax gear so I'm selling the adapter as well. It's in like new condition only mount couple times. There may be couple scratch where it come to contact with the mount otherwise as new.
06-26-2010, 02:15 PM   #7
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Check ebaY; there are Asian-manufactured 645 lens adapters for various cameras.

I have an original Asahi 6x7 lens to K-mount camera adapter. The previous owner modified it to Nikon mount(!). I use it on Canon 5D1 with Nikon lens to EOS camera adapter with excellent results. (my guess about choosing the Nikon mount is previous owner correctly decided to use the mount with the longest camera register, Nikon, and still permit mounting by adapter on cameras with shorter registers such as Pentax & Canon & Sony -- a sort of universal adapter if you will.)
06-26-2010, 05:23 PM   #8
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I paid $150 for mine via this forum. As I'm mainly into the 645 these days, it allows me to sell off compatible Pentax-M gear for my K-x. Sold two 35mm lenses, have one zoom on eBay at the moment, and will now sell the M 4/200mm as well since I can use the 645 FA-200mm if I need to which should be very rare indeed. Only problem would me the use of the A* 645 4/300mm via the adapter because this lens has no tripod mount and I expect its weight would break the plastic mount of the K-x! (The 400mm Yurihuta mentions has a tripod mount!).

07-10-2010, 04:52 AM   #9
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645 300mm to k support.

I am using the 300mm. 645 lens to Pentax k with adapter and supporting the lens using a HAMA video lens support.. The box does not give much info
HAMA OBJEKTIV-HALTERUNG.
HAM 8855 Monheim/bay.

Hope this helps
07-12-2010, 07:07 PM   #10
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QuoteOriginally posted by bannor75 Quote
I am using the 300mm. 645 lens to Pentax k with adapter and supporting the lens using a HAMA video lens support.. The box does not give much info
HAMA OBJEKTIV-HALTERUNG.
HAM 8855 Monheim/bay.

Hope this helps
That is certainly interesting! I've tried to google this but did not find anything. Is there no further info on the support itself?
07-14-2010, 02:03 AM   #11
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hama

There is an address on the guarantee card.
Hamaphot KG
Dresdner Str. 3-11
D.8855 Monheim
W Germany.

I struggle to post pics on Forums. If you want to follow this up with pics I can E mail them. via rhayles@talktalk.net.

regards Bannor75
07-14-2010, 06:54 AM   #12
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645 to K

Hi smolk.
Can you kelp me out, please. With the Pentax 645 adapter fitted to your K body, van you give me the measurement from the body flange to the lens flange. This has been given to me as an imperial inch or 25.41mm. this measurement is important to get any DIY fitting to focus to infinity. The Pentax adapter should confirm this measurement. I would be grateful for your help.
Bannor75.
07-14-2010, 05:49 PM   #13
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QuoteOriginally posted by bannor75 Quote
Hi smolk.
Can you kelp me out, please. With the Pentax 645 adapter fitted to your K body, van you give me the measurement from the body flange to the lens flange. This has been given to me as an imperial inch or 25.41mm. this measurement is important to get any DIY fitting to focus to infinity. The Pentax adapter should confirm this measurement. I would be grateful for your help.
Bannor75.
Hi, I'm not sure exactly what to measure. The black part measures about 2.5 cm, but the mount of the 645 lens resides within that distance. Since the shiny mount of the adapter is not included in the 2.5 cm, perhaps this is the distance. Again, it depends on what to measure.
07-14-2010, 06:28 PM   #14
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QuoteOriginally posted by bannor75 Quote
Hi smolk.
Can you kelp me out, please. With the Pentax 645 adapter fitted to your K body, van you give me the measurement from the body flange to the lens flange. This has been given to me as an imperial inch or 25.41mm. this measurement is important to get any DIY fitting to focus to infinity. The Pentax adapter should confirm this measurement. I would be grateful for your help.
Bannor75.
Well, the difference in camera registers is:

70.87mm -- 645 camera register
-45.46mm -- K camera register
======
25.41 or .01mm more than 1" (25.4mm)

so a 645 lens to K camera needs to hold the mounted 645 lens 25.41mm from the K camera mount, to retain infinity focus. The measurement is from the part of the 645 lens that contacts the front mount on 645 adapter to the part of the 645-K adapter that contacts the mount on the K camera.
07-15-2010, 12:21 AM   #15
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645 to K

Thanks. Those measurments confirms what I have been given. Being an oldie, I wanted to get confirmation from the genuine Pentax adapter.
If you can imagine the lens actually on the camera and then measure how far it is away from the camera with the adapter fitted, it should confirm these measurements.

Bannor75.
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