Help with lens sharpness
Apr 5, 2018 18:48:08 #
I was going to add that zooms that go into the telephoto range are usually noticeably softest at their maximum focal length setting. I used to have a 70-300 f/5.6-f/8.
I found that by shooting at 200 mm and cropping the resulting photo to 300mm magnification, I got noticeably sharper photos than if I had taken the photo zoomed all the way to 300mm. Perhaps SOME of the unsharpness you experienced was due to shooting at full zoom (70mm on your 28-70 zoom)
It's interesting information in the uV filter discussion. My used 17-70 came with a UV filter attached. I didn't even know there was a filter there until a week or so ago. ( I just thought that the front lens element was flat. ) I'll have to run some tests with filter vs filterless. I sent that lens to the importer's service department because of inconsistent focusing error. Sometimes front focus, sometimes back focus. When I got the lens back it still had the same malady just much less intensity of focusing inaccuracy. I wonder if I really only needed to remove the filter to achieve the same focus accuracy as with my other lenses.
I found that by shooting at 200 mm and cropping the resulting photo to 300mm magnification, I got noticeably sharper photos than if I had taken the photo zoomed all the way to 300mm. Perhaps SOME of the unsharpness you experienced was due to shooting at full zoom (70mm on your 28-70 zoom)
It's interesting information in the uV filter discussion. My used 17-70 came with a UV filter attached. I didn't even know there was a filter there until a week or so ago. ( I just thought that the front lens element was flat. ) I'll have to run some tests with filter vs filterless. I sent that lens to the importer's service department because of inconsistent focusing error. Sometimes front focus, sometimes back focus. When I got the lens back it still had the same malady just much less intensity of focusing inaccuracy. I wonder if I really only needed to remove the filter to achieve the same focus accuracy as with my other lenses.
Apr 5, 2018 20:12:18 #
Apr 5, 2018 20:19:04 #
not knowing the lens my first question is, is there a manual setting on that lens? and did it get switched.?
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