I’ve done plenty of imaging performance testing on a variety of systems, from millimeter wave through UV. Until very recently, such testing required expensive and specialized equipment. Now, with digital imaging (at least in the visible), you can perform the same type of characterization on your camera for free.
All you need is an LCD display.
LCD displays work totally differently from old CRT displays- they are not raster-scanned, for example. So, you can take photos of the display without fear of flicker (which happens if the shutter speed is not a multiple or fraction of 1/30s).
Why evaluate lens performance? There are at least two reasons.
First, lenses do not deliver constant performance over the full range of f-stop. Trained photographers have a saying “always use the lens stopped down at least 1 stop from maximum”. The reasoning behind this bit of lore is that almost all aberrations get worse with a larger aperture (smaller f-stop). Maximum sharpness will be obtained...
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