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nutek wrote:
your lens might be suffering from "far-sightedness" (don't laugh!). The focus calibration is ok for near subjects (i.e. most focus test charts, etc), but is out of whack for relatively far subjects.
Hi,
I just bought a Tamron 28-75mm a few days ago, and it does seem to have this exact problem. Focusing near (say, 1-3 meters) seems to produce sharp images, but if I focus it to a subject relatively far away (50 meters, for instance), I get rather blurry images - no part of the image seems to be clearly in focus. I was using a tripod for these shots.
I did some comparisons between my copy of the lens and a Canon 75-300 mm IS, both @ f/4.0, 75mm, and the shots taken with the Canon seem a tad sharper when focusing to a subject far away. Correct me if I'm wrong, but a good Tamron 28-75 should clearly outperform the Canon zoom. And f/2.8 makes things clearly worse with my copy of the Tamron.
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