On 2010-12-29 08:30 , Eric Weir wrote:
On Dec 27, 2010, at 6:24 PM, steve harley wrote:
3) you've got a problem with the focus and/or the lens
I wonder about lenses. I haven't attempted to evaluate any of them in this
connection -- and how would I know, in any given instance, that the problem was
with the lens? -- but I've tried to pick lenses that have a reputation for
producing sharp images and avoiding those that do not. My collection: A 28/2.8,
M 50/1.7, A 50/2.0, M 100/4.0 macro, 2 M 135/3.5s, and one A 70-210/4.0.
well, it could be the lens, but if the image appears very sharp in the
viewfinder, but comes out blurry, your camera may be back- or
front-focusing (viewfinder not properly coordinated with the actual
focus on the sensor); some simple tests on a tripod can confirm that
(the classic is to prop up a yardstick at 45 degrees and focus on the
18" mark)
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