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02-17-2011, 07:10 AM   #1
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645 lenses on Kxx bodies

Did someone try 645 lenses with a 'Pentax-K Adapter for 645' on regular DSLR bodies?

I guess it will not give any better IQ with the 645 lenses, but is it correct?

Are the 645-A-lenses worth anything to consider?

Thanks.

02-17-2011, 07:24 AM - 1 Like   #2
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I use the FA645 120mm macro all the time and like it. I have the 80-160mm as well, but don't really use it and will probably sell it. I use them on a k-7 with the Pentax adapter. There is no mechanical connection so stop down metering is required. It is kind of a pain in the butt, but most of my photos in the PPG are with the macro. It is a very good lens. Other than the macro, I would say it isn't worth it. the A version of the macro can be had for pretty cheap, but other than that and maybe a few telephotos you are just paying for extra weight and size with no gain in image quality. This is just my opinion. Hope this helps.
02-17-2011, 08:30 AM - 1 Like   #3
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Since aquiring an original 645 system last fall and a selection of A lenses to go with it, I've dabbled at using them on my K-10 with the converter. They work just fine with stop down metering. Other than just being able to do it and a lot of the A lenses being f2.8, they don't really give me anything more then other older k-mount or m42 primes.
02-17-2011, 10:13 PM - 1 Like   #4
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Here's a Mamiya M645 150/3.5 used with a K200D and a simple homebrew adapter made from an old lens bayonet ring and a rear lens cap.



02-17-2011, 10:18 PM - 1 Like   #5
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I'm looking for a 645-to-K adapter myself to further my dream of a compact system :

The bulk of the work would be done on ISO 50-100 film and my 645N using a couple 645 primes.
I would then have my K-x with 645-K adapter on hand; I'll be able to use those same lenses for night shots or establishing shots (sort of like a Polaroid back in the olden days).

Put the whole thing in a backpack and on my bike and I'm in business

Last edited by Dubesor; 02-18-2011 at 08:16 PM.
02-17-2011, 10:28 PM - 1 Like   #6
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QuoteOriginally posted by hoanpham Quote
Did someone try 645 lenses with a 'Pentax-K Adapter for 645' on regular DSLR bodies?

I guess it will not give any better IQ with the 645 lenses, but is it correct?

Are the 645-A-lenses worth anything to consider?

Thanks.
Not sure if this helps you, but I have shot hundreds of shots with Medium Format 67 lenses on my K20d. I got some extraordinary keepers via this route, and did not mind carrying the extra weight around because IQ was so nice.

I shot a 67 165mm f 2.8, with a 2x tele, for a 330mm 5.6 which was not only lighter than my SMC 300 f4, but seriously outperformed it too. Here are a few shots from that combo--this lens setup can close foucs more than 2x closer than the SMC 300 can BTW.







Hoanpham, please bear in mind, the 3 shots above are with a Medium Format, 67 lens & 2x teleconverter--no PPing here--no cropping--WYSIWYG

Last edited by Jewelltrail; 02-17-2011 at 11:35 PM.
02-18-2011, 03:33 PM   #7
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M645

I hadn't tried the Mamiya M645 lenses with a TC on the DSLRs until I saw Jewelltrail's pix above.

Here's the M645 150/3.5 again at f4 with, and without, the M45 Rokunar 2x converter at about
9 feet on the K200D at ISO 200. Cropped to 4:5 and re-sized to 800x600. Lightly sharpened to compensate in PP.

This lens seems to have very 'rich' and saturated colors and is surprisingly sharp even with the 2x converter.
DoF is relatively deep with the longer FL and registration distance too which could be a useful attribute of the 645 lenses.

Manual focus and exposure of course.

H2

with 2x
w/o TC
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