Thanks Mike! That would be a new set of tests, much like those posted by
Derby and Boris but maybe with some lens test target just to get numbers
and easier evaluation. I'm watching those bricks since forever - er,
since yesterday and I'll go the next (test) step asap.
But even trying those additional tests would be pointless if the light
fall off at the corners got too extreme, or the lens actually didn't
print over the entire 35mm frame. The area of my interest is from 70 to
300mm, 135~200mm first o fall - but so far the coverage is better than I
expected. Looks promising.
Please - and that invitation is on an open basis - if you have the
samples and willingness put no place to post, I can host some tests with
proper credits, to some small limit of bytes to be clarified as soon as
my wombathost - er, web hosting answers my upgrade request. Details
offlist...
Of course, Pentax ofers no proper FF coverage anymore, so we would be
doing that on our own... apalling... :-)
LF
mike wilson escreveu:
---- Luiz Felipe <[email protected]> wrote:
I was looking for data on the available 180~200mm 2.8 lenses for K and
EF mounts, and found some story about how the DA* 200 2.8 is related to
the former 200mm full frame and so it possibly would cover said full frame.
That got me wondering if one of the tech-oriented actually knows the
image circle dimensions for the DA lenses, and how much is missing. I
know the difference should be proportional to the difference from APS-C
to 24x36mm, but would like ko know the size and borderline falloff
evolution on the DA lenses.
Just wondering, TIA. :-)
From personal testing with the 18-55 on an LX, full-frame coverage seems to be
acheived somewhere between 24 and 28mm. The 50-200 displays full frame
coverage throughout. Whether that coverage is useable with any particular lens
is an entirely different matter.
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Luiz Felipe
luiz.felipe at techmit.com.br
http://techmit.com.br/luizfelipe/
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