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09-16-2011, 02:12 AM   #1
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uncompromising alternative to pentax 35mm manual lens

of course in terms of resolution... your suggestions..

09-16-2011, 02:42 AM   #2
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samyang 35mm f/1.4
09-16-2011, 03:20 AM   #3
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You could modify a Contax 645 Zeiss distagon 35mm f/3.5 lens - that might offer superior image quality to the A series 35mm f/3.5 - though knowing Pentax the A series lens would probably be a refinement of the Zeiss lens design - so it is possible there will not be much improvement in IQ.

Contax 645 lenses are still quite expensive these days, older Hasselblad V series lenses could also be adapted but for 6X6 format 38mm is the widest lens hasselblad produced that isn't a fisheye

QuoteOriginally posted by adpo Quote
samyang 35mm f/1.4
The samyang lens isn't compatible with the Pentax 645D

Last edited by Digitalis; 09-16-2011 at 03:38 AM.
09-16-2011, 05:29 AM   #4
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Assuming you get a good copy, the manual focus 645 35mm lens is close to as good as it gets, especially in the F8-11 range.

09-16-2011, 05:31 AM   #5
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QuoteOriginally posted by CDW Quote
Assuming you get a good copy, the manual focus 645 35mm lens is close to as good as it gets, especially in the F8-11 range.
i`d say F11-F13!!
09-16-2011, 05:32 AM   #6
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QuoteOriginally posted by Digitalis Quote
The samyang lens isn't compatible with the Pentax 645D
he probably didn't realize he was reading a MF subject ...
09-16-2011, 09:47 AM   #7
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QuoteOriginally posted by aurele Quote
he probably didn't realize he was reading a MF subject ...
And the OP just assumed everyone understood he was talking about a 645 format with that subtle clue of a manual lens and reputation. The Pentax 6x7 also has a 35mm lens and is a medium format camera.

Last edited by tuco; 09-16-2011 at 10:54 AM.
09-16-2011, 10:37 AM   #8
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this is why i shouldnt post at 3 in the morning -.- sorry about that!

09-16-2011, 05:09 PM   #9
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QuoteOriginally posted by adpo Quote
his is why i shouldnt post at 3 in the morning
...especially without coffee...
09-19-2011, 02:16 PM   #10
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QuoteOriginally posted by Digitalis Quote
, older Hasselblad V series lenses could also be adapted but for 6X6 format 38mm is the widest lens hasselblad produced that isn't a fisheye
The Hasselblad 38mm Biogon! is a fixed lens on the Hasselblad SWC body. It is an "original SW lens" - no retrofocus ! - with a superb quality, but you canīt adapt it If you want to adapt a Hassy V lens - take the 40mm Distagon FLE, the 30mm F-Distagon is a fisheye (F=fisheye).
09-19-2011, 05:26 PM   #11
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QuoteOriginally posted by veraikon Quote
The Hasselblad 38mm Biogon! is a fixed lens on the Hasselblad SWC body. It is an "original SW lens" - no retrofocus ! - with a superb quality, but you canīt adapt it
nice to see someone who knows their cameras, no the 38mm Biogon is not adaptable. The registration distance differential between Pentax 645 and Hasselblad V is 70.87mm Vs 74.9mm - which means getting infinity focus could be a bit tricky. The flange on the Contax 645 is exactly 64mm - so that would be the more manageable option when it comes to adapting lenses.
09-19-2011, 05:46 PM   #12
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QuoteOriginally posted by Digitalis Quote
nice to see someone who knows their cameras, no the 38mm Biogon is not adaptable. The registration distance differential between Pentax 645 and Hasselblad V is 70.87mm Vs 74.9mm - which means getting infinity focus could be a bit tricky. The flange on the Contax 645 is exactly 64mm - so that would be the more manageable option when it comes to adapting lenses.
You lost me. How can you adapt a lens with a flange distance of 64mm and retain infinity focus with a Pentax body with a flange distance of 70.87mm? And why would the Hasselblad lens with a longer flange distance be harder? Especially since there are Pentax 645 to Hasselblad adapters available.
09-19-2011, 08:08 PM   #13
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Sometimes a lens with a shorter flange focus distance can be easier to adapt than a longer one - adapting a lens also depends on the design of the lens itself - and if you have ever worked on a Contax 645 lens you will know what i'm talking about - the helicoids on Contax 645 lenses are longer than they are supposed to be. Which means you can bring the optics further forward to the infinity focus point on a pentax 645 - however on a Hasselblad V series lens you can't - the optics to move back far enough to get infinity focus on a Pentax 645
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