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09-22-2012, 12:02 PM   #1
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k-mount issue

The SDM contacts in the current k-mount prevent a FF sensor...
Would a Pentax FF not be able to use SDM lenses?
thoughts?

09-22-2012, 12:11 PM   #2
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I'm not sure about that : I have two sigma FF lenses that use those contacts...
09-22-2012, 12:31 PM   #3
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And don't those contacts date back to film SLR era (initially used for power zoom)? I don't think they are an issue.
09-22-2012, 12:31 PM   #4
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I might not be clear...
the two contacts in the lower right hand corner of the mount that are separated from the rest of the contacts

09-22-2012, 12:33 PM   #5
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It won't be a problem. The full frame Sigmas (50 1.4, etc) that have HSM have those contacts as well.
09-22-2012, 12:34 PM   #6
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QuoteOriginally posted by photoman1 Quote
I might not be clear...
the two contacts in the lower right hand corner of the mount that are separated from the rest of the contacts
Yep, those are the ones. They've been there in film SLRs, haven't they?
09-22-2012, 12:37 PM   #7
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QuoteOriginally posted by photoman1 Quote
I might not be clear...
the two contacts in the lower right hand corner of the mount that are separated from the rest of the contacts
same contacts as the old Power Zoom contacts found in some FA zoom lenses, like the FA 100-300mm below:



compare it to DA 17-70 SDM contacts:



Voila!
09-22-2012, 12:42 PM   #8
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thanks guys for answering my question

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