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
: Opinions about 80-200 f2.8 zooms
I have been following the list for the past couple of months and
have
found it to be both interesting and informative about Pentax,
cameras
and lenses, photography in general and other subjects. As my initial
foray into the list I would like to solicit opinions
This one time, at band camp, Jostein [EMAIL PROTECTED] wrote:
The Pentax lens is getting very hard to find these days, and is
hideously expensive new. It's gone out of production.
I have been pondering this also. I have decided to go with the Sigma
70-200mm 2.8 as it offers much the same as
To those that have responded to the original thread, thanks very much
for the replies. However, the replies from Kevin and Jostein, brought up
a question that I had been wondering about myself while pondering lens
options. What determines AF performance? I though that I had, in the
past, read
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
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 then a lens that seems to hunt more
than another is not directly at fault? It is the camera algorithms not
being able
- 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
I have been following the list for the past couple of months and have
found it to be both interesting and informative about Pentax, cameras
and lenses, photography in general and other subjects. As my initial
foray into the list I would like to solicit opinions about 80-200 f2.8
AF zooms.
Hi Larry.
Welcome aboard. I snipped your post a tad.
Cannot speak for the Pentax version as i dont have one, yet, but i do a lot of
equestrian
work with my
Nikon f2.8 and it works out very well.I;'d have to say atleast 97-98% usable,well
focused
shots from it.
If i am following a Dressage
12 matches
Mail list logo
