I can only go from general principles as I have no direct experience
with either lens. However if Pentax tells the truth and the DA is
optimized for an APS-C sensor I'd expect that there could be more light
fall off in the edges and corners of the frame of an APS-C camera.
Otherwise I'd expect sample variation to have more of an effect on image
quality than the actual differences between the two designs.
On 12/13/2014 9:16 AM, Ralf R Radermacher wrote:
Hello all,
I'm thinking about replacing my trusted M 2/35 mm through a AF lens. A
look at Bojidar's website has taught me that the M has 7 elements in 7
groups while the FA and DA versions both have 6 elements in 5 groups
where one is an aspherical element.
Is there anyone who's ever been able to compare any two of all three
of them? How similar are the FA and DA versions optically?
I'm quite happy with the M's optical quality but my eyes aren't as
good anymore as they used to be and focussing is getting a little
difficult.
Ralf
--
I don't want to achieve immortality through my work; I want to achieve
immortality through not dying.
-- Woody Allen
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