----- Original Message -----
From: "Bob Sullivan"
Subject: Re: On FF but without intent to start a flame
Yes, that's pretty sad. Is it mechanical or electronics that are
failing? It would seem that the lens would have plenty of travel to
sort things out mechanically. Is it weak electronics?
I get better results with the DA60-250/4 at the short end with
autofocus wide open than with most other older autofocus lenses
(FA's).
I think it's just that the AF sensor isn't accurately able to pick out what
it is pointed at. The sensor points may be too large, or the resolution of
the AF driver may not be fine enough. Unfortunately, the AF misses on a
pretty random basis, sometimes slightly behind, sometimes slightly in front
and somtimes, albeit disturbingly rarely, bang on the money.
It's too bad because when it works, it works very well indeed, it just
doesn't work often enough.
William Robb
On Wed, Feb 24, 2010 at 9:49 AM, William Robb <war...@gmail.com> wrote:
The shoot I did on Saturday had about 50% missed focus shots, and this
was
with the lens well stopped down.
I don't even try to use AF with that lens above f/2.8 because I won't
have
anything usable.
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