In that first photo the bricks in the driveway give a pretty good idea
of the DOF which looks to be about 4 bricks to either side of the rear
bumper of the truck.in the first shot. Looks to me like your focus is
just about right in that shot. The other 80mm 2.8 shots seem to be
focused closer than the bumper. The framing and lighting vary somewhat
between shots making it a bit hard to compare them to the first one, at
least to my old eyes they look overall a bit fuzzy.
graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
-----------------------------------
Jens Bladt wrote:
Small? 2104 x 1468 can easily fill you screen!
And yoyu're right - it's probably not the lens (although I had great
problems getting sharpness at all at F 2.8 - F3.5:
It may very well be the AF system.
Yes, I use the term when the lens/camera is focusing further away than it
should - that is behind the point where the red square in the viewfinder is.
ASome times at the top or above the little circle that confirmes focus in
the *ist D.
In this shot, I focused at the white streamer (stensikkert.dk) - but look
how sharp the brick wall looks here http://www.jensbladt.dk/Test/rooms.html
Compared to the second and third shot (made with the FA lens). It can't be
that the Tokina has a LOT better DOF at F. 2.8, can it? It must be because
the focusing is off. Behind the white board. OR this sample og the lens is
not good.
I find the SMCP FA 2.8/80-200mm ED(IF) quite good, when focused manually.
Regards
Jens Bladt
http://www.jensbladt.dk
-----Oprindelig meddelelse-----
Fra: graywolf [mailto:[EMAIL PROTECTED]
Sendt: 4. december 2005 22:30
Til: [email protected]
Emne: Re: A better 70-200mm F. 2.8
The photos are rather too small to tell anything from. However, it is
most likely an auto-focus problem, not one with the lenses.
Try manual focus. After you have the proper part of the image in what
you think is correct focus, go look out the window for 5 minutes or so,
then come back and tweek your focus as quickly and exactly as you can.
Now you can take your photo. Do that with the other lenses. Get back to
us with the results.
I would look at every other posibility with focus problems before
blaming the lens.
And by the way, from a technician's point of view back focus problems
means the lens is not focusing the image exactly the flange to film
distance from the lens mount. I do not think that is how you were using
the term.
graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
-----------------------------------
Jens Bladt wrote:
I have been trying out three different lenses in the 70-200mm range.
Sigma EX 2.8/70-200mm APO
Tokina AT-X Pro 2.8/80-200mm
SMCP-FA 2.8/80-200mm ED(IF)
All of them seem to suffer from Back Focus. The Sigma not much, though.
Had I been offered a used Sigma, I probably would have bought it.
I published a small test showing the problem.
Due to Back Focus (i BELIEVE), my SMCP F-4-5.6/70-210mm is the sharper one
at F. 5.6.
Please take a look and feel free to comment:
http://www.flickr.com/photos/bladt/sets/1509814/
Regards
Jens
