Guess I will have to read that debate...
Bottom line - never mind a full frame dslr isn't available from Pentax
and most likely will never be - wich current (DA included) Pentax lenses
would cover almost entirely a FF sensor OR a 35mm film frame?? That's my
interest - how poorly illuminated would be a 35mm film frame exposed
with current Pentax lenses... in particular those ending in the
135~200mm range, 2.8 aperture preferred.
That idea that "most of the above XXmm DA lenses have larger enough
image circles" actually puts the "there is no lens support to FF on the
roadmap" statement under fire. Granted there are other considerations,
but all the same, the [image circle - light fallof] limit may be not so
real, for good part of the lenses.
LF
William Robb escreveu:
----- Original Message -----
From: "John Francis"
Subject: Re: image circle of DA lenses: how much smaller than FF?
Above some focal length (well below 200mm) it's likely that just about
any lens will have an image circle easily large enough to cover 36x24mm.
But, as Ned Bunnell point out in his blog entry on the forthcoming camera,
there's a difference between covering an image circle and covering it
well.
The DA lenses are not designed for sensors of that size, so things such as
corner resolution, distortion, etc. may not be sufficiently high.
(There again, as he also mentions, some older lenses may also fall short
in that regard, even though they were designed for use on film cameras).
There has been a rather protracted and sometimes heated debate about this on
ForumNeurotica over the past day or two.
The best arguement that the naysayers can come up with is that wide open
corner performance isn't good enough on some lenses, so the entire full
frame sensor idea must be wrong.
The worst argument that they've been able to make is the old Pentax is a
small company that can't afford it, the market is too small, blah blah
blah....
The more sensible people are of the opinion that stopping down a bit will
cure most problems, that some lenses don't perform well, but others do,
proving only that some lenses are better than others, and that Nikon, Canon
and Sony seem to be doing fairly well making 35mm full frame DSLR cameras,
and that there seems to be a lot of people adapting full frame Pentax lenss
to their digital EOS cameras and getting good results.
It looks to me like Ned is saying what he is being told to say by his
political masters, and not what he might say as a photographer.
Perhaps the whole Leica D-Lux fiasco caused Pentax to rein in their wild
horse a little, and got him start talking more like the president of a
camera company.
William Robb
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Luiz Felipe
luiz.felipe at techmit.com.br
http://techmit.com.br/luizfelipe/
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