If the texture is not regular and you can't rely on straight lines to
help framing, you may ask a friend to hold a small, flat mirror with the
back to the wall in the center of the frame to make sure you're properly
aligned. Any error on the sharpness will be due to problems in the focal
plane.
Sorry if this is too basic... :-)
LF
[email protected] escreveu:
The serious 16-50 fault was an uneven focal plane. Shoot a textured wall at
f2.8 and f4. Try to keep the camera parallel to the wall. Do several exposures
to lessen the chance of operator error. Check the results to see if the focus
is even across the frame. If one side of the frame is in focus and the other
side is soft, it's probably a bad copy.
Paul
----- "Toine" <[email protected]> wrote:
Since prices are going up I'm warming up for a 16-50. Would it be
possible to do some quick tests in the shop to check if it's ok? What
do I look for? Would a quick test of a wall at f/2.8 and maybe 2-3
meters distance reveal a lemon?
Toine
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Luiz Felipe
luiz.felipe at techmit.com.br
http://techmit.com.br/luizfelipe/
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