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07-26-2009, 05:02 AM   #1
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K7 and Manual Lenses

I've got a good collection of SMC-M and SMC-A lenses which I used a lot with my old K200D. My particular favourite is the SMC-M 28mm/3.5.

I've now got the K-7, but when I use a SMC-M lens, enable aperture ring, set the aperture, and then push the green button, the shots I'm getting are very underexposed. I'm having to compensate with 2 stops to get reasonable exposure. I've not had this problem with SMC-A lenses, and I didn't experience this with the K200D.

I can compensate for this with addition EV, but it's a pain. Anyone else suffering this?

07-26-2009, 05:09 AM   #2
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What is the metering set to? Isn't there something about the metering can only be set to a particular type? (your query is ringing bells about this)
07-26-2009, 05:19 AM   #3
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Same as I would with the K200D, set to 'M' manual, with the metering at 'green' the evaluative setting.

Last edited by IainG; 07-26-2009 at 05:38 AM.
07-26-2009, 05:59 AM   #4
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Try to turn lens in one or another direction. It helps

07-26-2009, 06:01 AM   #5
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Interesting that you are getting underexposure with the K-7. I had pretty much given up using my M lenses because the exposures were so bad with the K20 - my 24mm f2.8 would give over-exposed pictures at just about all apertures and my 50mm f1.4 was inconsistent, some apertures overexposing, some under. My K-7 meters perfectly at all apertures with both lenses, so it sounds like some of these new cameras meter differently than others.

Have you changed the focus screen?
07-26-2009, 07:36 AM   #6
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I've been using a range of manual Pentax lenses including some really old Asahi primes that could only have been made during the Jurassic period. I've had no problems with metering worth noting so I'm suspecting that you've either got interference from a deep dark setting, or there is something up with the particular K-7 you possess. Maybe a trip to the local camera store to try your lenses on their cameras and compare?
07-26-2009, 04:20 PM   #7
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QuoteOriginally posted by petercrane Quote
I've been using a range of manual Pentax lenses including some really old Asahi primes that could only have been made during the Jurassic period. I've had no problems with metering worth noting so I'm suspecting that you've either got interference from a deep dark setting, or there is something up with the particular K-7 you possess. Maybe a trip to the local camera store to try your lenses on their cameras and compare?
What are the asahi primes you've got. I bought my first one recently, Asahi-Kogaku 50/3.5 which I think is the first lens to be made. Curious to know, what others are worthy of pursuit.
07-26-2009, 04:37 PM   #8
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QuoteOriginally posted by IainG Quote
Same as I would with the K200D, set to 'M' manual, with the metering at 'green' the evaluative setting.
If by "evaluative" you mean the multi-segment metering, that doesn't work with "M" lenses, on either the K200D or the K-7. On the K200D, if you have multi-segment metering selected normally, it automatically changes to center-weighted when you mount an M lens. I'd assume the K-7 is similar, but you might look into that. And do some controlled comparisons between the cameras using the same scene, same lens, etc.

02-13-2010, 03:28 AM   #9
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manual lenses on DSLR

I've a couple of Pentax LX bodies (still using film and scanning to digital) with some nice Pentax-A lenses - 20mm 2.8, 15mm 3.5 plus some good Sigma lenses - 28-70 f2.8, Sigma Apo 75-300 5.6 and Sigma 400 5.6 - can I use these lenses on say a Pentax K7 DSLR? I'd appreciate any comments - thanks.
02-13-2010, 04:49 AM   #10
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QuoteOriginally posted by wibutee1 Quote
I've a couple of Pentax LX bodies (still using film and scanning to digital) with some nice Pentax-A lenses - 20mm 2.8, 15mm 3.5 plus some good Sigma lenses - 28-70 f2.8, Sigma Apo 75-300 5.6 and Sigma 400 5.6 - can I use these lenses on say a Pentax K7 DSLR? I'd appreciate any comments - thanks.
Yep! No problem (exept some metering problems probably, as described above, but these are to overcome!), this is exactely why I decided to go for Pentax!
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