----- Original Message ----
> From: Larry Colen <[email protected]>
> To: Pentax-Discuss Mail List <[email protected]>
> Sent: Fri, March 19, 2010 2:30:17 PM
> Subject: 400/5.6 vs bigma ?
>
> It seems that I've got a weak spot for fast primes.
I've been talking to
> sonpix about his Pentax 400/5.6 and I'm curious how it would compare to my
> bigma?
It's a little faster at that length, and a little shorter, but how
> does it compare in size, sharpness, aberration and bokeh?
Larry,
I have the A400mm f5.6. I don't think it translates well on digital, at least
so far (this might be reduced on a FF sensor or one with a smaller crop factor
than 1.5). I have used it on both the K10D and K20D and there's just too much
fringing for my taste. I compared the big Pentax-M 67 400mm f4 IF ED lens on
these bodies, as well, thinking that the ED glass might make a difference in
the fringing but I didn't see one (though I may have been introducing other
issues since that lens was designed for the 67 system). But, since I was
thinking of getting the FA 400mm f5.6 which also has ED glass I thought I
should try it.
You may be better off looking into the long DA primes. They've been designed
with the smaller sensor in mind.
-Brendan
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