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Anonymous
>>138513 Who cares? Is it sharp enough for what you want to do with it?
Here's a simple battery of tests to run on your lens:
Throw a soda bottle onto a wool sweater. Put the camera on a tripod and point it at said arrangement. Focus on some fine text on the soda bottle... the nutritional information works well. Using mirror lock-up and a timer, shoot one frame at every available aperture. This is testing its ability to resolve simple lines, kinda like a ghetto MTF chart.
Then focus on the sweater, and do the same thing. This is testing its resolution and accutance on real-world fine detail.
Examine the files. Figure out what your sharpest aperture is. See if it will pick up enough detail. (Any modern lens will for almost anyone.)
Next, get a friend. Shoot a bunch of portraits of them, at all apertures and a wide range of focusing distances. Examine the files, see if you like the look of the lens, including the sharpness. The reason to do portraits of a friend is because you're intimately familiar with your friends face and how the lens "draws the picture" will be immediately apparent. Also, of course, try it in other situations similar to what you'll be using it for.
Do the flare tests Mike Johnston discusses here: http://www.luminous-landscape.com/columns/sm-03-01-12.shtml Can you live with the amount of flare and/or do you like the look of the flare?
Based on the results of all that, decide whether the lens is "x"-enough for you.
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