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02-20-2020, 10:17 AM   #1
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SMC or HD Pentax-DA 21mm F/3.2 AL Pancake Lens Full Frame Compatibility?

Hello fellow K-1 users...

Has anyone tried the SMC or HD Pentax-DA 21mm F/3.2 AL Pancake Lens on the K-1 or K-1 Mark ii?
I am looking to see how compatible the lens will be on a full frame. Curious to know is there some vignetting? If so how much? Or is the image clipped a bit on the left and right, ie. does the lens image cover the entire sensor or not?

Love to add this lens to my selection but not sure how compatible it is. Thanks for any feedback in advance!

Stephen.

02-20-2020, 10:29 AM - 1 Like   #2
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QuoteOriginally posted by PixL8 Quote
Hello fellow K-1 users...

Has anyone tried the SMC or HD Pentax-DA 21mm F/3.2 AL Pancake Lens on the K-1 or K-1 Mark ii?
I am looking to see how compatible the lens will be on a full frame. Curious to know is there some vignetting? If so how much? Or is the image clipped a bit on the left and right, ie. does the lens image cover the entire sensor or not?

Love to add this lens to my selection but not sure how compatible it is. Thanks for any feedback in advance!

Stephen.
I think it „works“ similar on FF as the DA15Ltd. - so even in Square Mode you‘ll have to crop. A general overview ...

DA lenses on Full Frame: Test Shots thread - PentaxForums.com
02-20-2020, 10:34 AM - 1 Like   #3
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Short answer: No. Not even close.

Ref: RiceHigh's Pentax Blog: Compatibility of DA Lenses on Full Frame

There are other sites as well that describe this and share sample shots. There are some DA lenses that work well on full frame, some that are close enough to drive debate over a yes or no answer, and then there's lenses like this which won't work on full frame. You can enable square crop mode on the K-1 to basically cut out the dark corners but this is going to take away sensor area from the final image.

The DA 35 f2.4 seems to work pretty well on full frame. The FA (and HD FA that just came out) 35mm f2.0 is from the film era and definitely covers full frame. Or you can shop for used glass.
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