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10-02-2010, 02:00 PM   #16
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QuoteOriginally posted by boriscleto Quote
There is no evidence that it uses the same optical formula as the FA 35. Pentax says it was designed specifically for DSLRs.

smc PENTAX DA L 35mm F2.4 AL - Official PENTAX Imaging Web Site
Don't they say the same thing about the DA 40, which clearly was based on the M 40 pancake? The only lenses currently sold, that are guaranteed to work on full frame are those that have FA in their name, but often older lens designs are recycled and allow for full frame coverage.

10-02-2010, 04:13 PM   #17
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QuoteOriginally posted by Rondec Quote
Don't they say the same thing about the DA 40, which clearly was based on the M 40 pancake? The only lenses currently sold, that are guaranteed to work on full frame are those that have FA in their name, but often older lens designs are recycled and allow for full frame coverage.
Yeah, but some said that the DA40 has still some slight vignetting in the corners. I think the only DA lenses that are fully compatible or functional with FF are above 50mm.
10-02-2010, 04:59 PM   #18
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QuoteOriginally posted by boriscleto Quote
It is a DA lens. That means it is not a FF lens. If it was full frame it would be a D FA.
No, actually DA means that it is not necesarily a FF lens. there are various DA lenses that are known to be compatible with 35mm bodies.

On topic, I believe that Pentax didn't confirm anything about the DA 35mm 2.4 being FF but it is pretty easy to check once the lens is on the market
10-02-2010, 06:38 PM   #19
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QuoteOriginally posted by Pentaxor Quote
Yeah, but some said that the DA40 has still some slight vignetting in the corners. I think the only DA lenses that are fully compatible or functional with FF are above 50mm.
Not to be argumentative, but how many of the full frame compatible lenses out there have some vignetting that we never really noticed on film. Digital allows pixel peeping and better analysis of lens performance than we ever had on film. I think the original 40 pancake probably has some vignetting as well and it was definitely designed for film.

10-02-2010, 06:52 PM   #20
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QuoteOriginally posted by Rondec Quote
Not to be argumentative, but how many of the full frame compatible lenses out there have some vignetting that we never really noticed on film. Digital allows pixel peeping and better analysis of lens performance than we ever had on film. I think the original 40 pancake probably has some vignetting as well and it was definitely designed for film.
this is in view with the type of vignetting (total circular black-out) that is shown by DA lenses on a FF slr. not necessarily the type of common vignetting that occurs in lenses. I have seen such samples, especially the wide ones. although I kinda forget about the DA40 to be certain, but it was nevertheless mentioned to have such vignetting. I forgot the main website that shows the samples, but RH (robin hood) also had an article about it. you can check it out just to be sure. although above 50mm would be of a safe bet.
10-02-2010, 07:28 PM   #21
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Just to be clear: the DA 40 does not show black-out vignetting on full-frame. I would be surprised if the DA 35 did, either. The tougher question is whether the FA 35 optical formula was altered in ways that affect FF-suitability. I still haven't heard a definite answer to that question about the DA 40 and M 40, and they have both been available for testing for years. As Rondec suggested, a certain amount of corner softnessand even loss of brightness was tolerated in 35mm SLR lenses, especially in wide-angle lenses. The ease of testing in digital makes these "defects" more evident, so that some 35mm lenses would not be "DSLR-compatible by their test results . . .
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