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<blockquote data-quote="480sparky" data-source="post: 274443" data-attributes="member: 15805">I don't concern myself with AF noise, distortion, exact focal length, etc.&nbsp; I'm testing for sharpness, which is what is paramount for my work.&nbsp; Distortion can be corrected in post, but a lens that controls it better makes for less work for every shot that needs corrected.I really don't care that a supposed 17mm lens is actually 17.85439856mm.&nbsp; Nor f/4 is actually f/3.984758663.I don't shoot brick walls, newspapers, test charts, etc. I shoot my back yard.&nbsp; I test every full aperture and every focal length marked on the barrel. I then pixel-peep the results at 100% and make what is purely a judgement call. Nothing scientific about it.Here's one sample result, that for my Nikkor 24-120 f/4:<img src="http://i214.photobucket.com/albums/cc172/480sparky/Photography%202/SweetSpot.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The top left of the pair of numbers is my judgement of the center sharpness, and lower right of the pair is the corner.&nbsp; I color-code the backgrounds based on the numbers, making the focal length/f-stop combo green as a first choice, blue as a second choice, orange as a last result, and red means avoid if at all possible.</blockquote>

[QUOTE="480sparky, post: 274443, member: 15805"] I don't concern myself with AF noise, distortion, exact focal length, etc. I'm testing for [I]sharpness[/I], which is what is paramount for my work. Distortion can be corrected in post, but a lens that controls it better makes for less work for every shot that needs corrected. I really don't care that a supposed 17mm lens is actually 17.85439856mm. Nor f/4 is actually f/3.984758663. I don't shoot brick walls, newspapers, test charts, etc. I shoot my back yard. I test every full aperture and every focal length marked on the barrel. I then pixel-peep the results at 100% and make what is purely a judgement call. Nothing scientific about it. Here's one sample result, that for my Nikkor 24-120 f/4: [IMG]http://i214.photobucket.com/albums/cc172/480sparky/Photography%202/SweetSpot.jpg[/IMG] The top left of the pair of numbers is [U]my judgement[/U] of the center sharpness, and lower right of the pair is the corner. I color-code the backgrounds based on the numbers, making the focal length/f-stop combo green as a first choice, blue as a second choice, orange as a last result, and red means avoid if at all possible. [/QUOTE]

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