Monday, November 8, 2004, 12:39:45 AM, Alan wrote:
AC Many people have reported some Sigma lenses took longer to lock focus (tend
AC to hunt more). It seems that the distance and focal length data are required
AC for AF as well, and those data are held by a chip inside the AF lenses.
Probably. I
So which is responsible for the AF performance? Is it the lens? the camera?
or both?
and how does each influence the AF performance? Inquiring minds want to
know
Both. Some AF lenses have lighter and smoother AF mechanisms might AF
faster. Some AF bodies have stronger AF motor might AF
So which is responsible for the AF performance? Is it the lens?
the camera? or both? and how does each influence the AF
performance? Inquiring minds want to know
Both. Some AF lenses have lighter and smoother AF mechanisms might
AF faster. Some AF bodies have stronger AF motor might AF
- Original Message -
From: Larry Cook
Subject: AF Performance (Was: Re: Opinions about 80-200 f2.8 zooms)
So the answer is that the camera possess the algorithms for AF but
the performance is based both on the algorithms and how responsive
the lens mechanism is? If that is correct
I understand that circumstances can stymie focusing but what I was
concerned about were reviews that talk about a particular lens' inabilty
to focus well or that it hunts more than another lens. Currently I have
all manual focus lenses and I am trying to determine if an AF lens would
be better
Many people have reported some Sigma lenses took longer to lock focus (tend
to hunt more). It seems that the distance and focal length data are required
for AF as well, and those data are held by a chip inside the AF lenses.
Alan Chan
http://www.pbase.com/wlachan
So the answer is that the
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