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Forum: Pentax K-30 & K-50
02-13-2014, 09:05 AM
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Are you sure the problem is diffraction? Could be many things that make an image soft: atmospheric conditions, filters, anything on the lens, high ISO, misfocusing (try taking a shot using live view focusing?), not using a tripod, not using 2 sec timer (SR disabled), not using remote, lens just being soft in the edges at that focal length.. and at 170mm, even if you use a tripod, a breeze can cause blur. Also, keep in mind that the field of focus is not perfectly flat, so a wall in front of you might be sharp in the middle but misfocused in the edges.
In regards to diffraction, some say that f9 is the limit on APSC (I forget where I read this), but I personally go up to f14 if I need to (for the DoF). f16 and above is where it gets really bad.
However, I think that shot looks pretty good. Too bad you are making large prints, because for web use, it would be good enough. On large prints, at close inspection, photos quickly start to look shaky
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Forum: Pentax K-30 & K-50
02-19-2014, 10:15 AM
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K-30 has great range in the low end. In fact, I typically underexpose by a stop knowing that I have a much better chance of recovering detail from darker areas than brighter areas.
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