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09-12-2010, 06:13 PM   #1
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DFA 645 f2.8 55mm AL[IF] SDM AW not usable with K5/K7 ?!?

As we can see here
smc PENTAX-D FA 645 55mmF2.8 AL[IF] SDM AW. A Unifocal Standard Lens for use with Medium-Format Digital SLR Cameras; The First Model of the smc PENTAX-D FA 645 Series

the new standard lens for the 645D has no aperture ring.

So we take a look at the lens adapater
http://www.pentax.de/de/product/38455/media/7fcc5e95140fd3fe0d3c7e07d8355054...or_K645_18.jpg

and we don't see any electric pins for changing the aperture with the wheel on our DSLR. I am wrong with it? Is there any way to change the aperture of the lens on a K5/K7-body?

Is there any other adapter out in this world which can solve the problem?


Last edited by Wololo; 09-12-2010 at 07:08 PM.
09-12-2010, 06:40 PM   #2
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The adapter doesn't transfer the contact data, since 645 lenses use an entirely different system than K-mount lenses, so you're right- this lens won't be usable in practice on K-mount SLRs, since it'll always remain at F22 on DSLRs (and F2.8 for non-crippled mounts, I believe, as the adapter does connect the aperture levers).

More importantly, however- why would you want to adapt this lens? On digital, it's not going to be any better than a full-frame K-mount 50mm lens anyway, and it's much slower.

Adam
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09-12-2010, 07:04 PM   #3
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@Adam

Thank you alot for your fast answer, but do you know any FF K-mount lens WR? Only the 100 mm F2.8 macro is in my mind...

Last edited by Wololo; 09-12-2010 at 07:44 PM.
09-12-2010, 07:16 PM   #4
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No, but...the 645 D FA 55mm is no longer WR when coupled to a K-mount body using the adapter (which is not weather sealed).


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09-12-2010, 07:48 PM   #5
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This is the sad truth. So lets hope for photokina with new magical lenses.
09-13-2010, 01:09 AM   #6
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The more absurd is that the DA*55/1.4 is weather sealed, extremely sharp wide open and even better closed down and cheaper than the DFA 645 55/2.8.

Getting a full compatibility of the later on a K7 has no real utility.
09-13-2010, 04:41 PM   #7
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QuoteOriginally posted by Adam Quote
(and F2.8 for non-crippled mounts, I believe, as the adapter does connect the aperture levers).
Does it really? I've asked about this previously, and while people sometimes claim they're connected, this is either met with no comment or a correction that they aren't. Since I only have a Chinese knock-off adapter I won't say you're wrong, but I would like to suggest the possibility.

(The 67 to 645 adapter does connect the aperture levers though.)
09-13-2010, 06:49 PM   #8
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I was wrong- I think I got that mixed up with the 6x7->645 adapter, which does have the functionality.


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09-16-2010, 09:04 AM   #9
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Another question would be to know if this lens is compatible with the 645N and 645NII in term of coverage and AF.
09-17-2010, 04:23 AM   #10
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QuoteOriginally posted by fs999 Quote
Another question would be to know if this lens is compatible with the 645N and 645NII in term of coverage and AF.
From what I understood, coverage is ok (and so will be all future 645 lenses, including the wide ones) but the AF will be SDM so not supported by film camera.

Not stupif to take a film 645 as a backback of teh 645D IMO.
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