I dunno, I frequently use my lenses at the extremes, wide open and find them sharp enough but generally stopped down 2-3 stops is the sharpest aperture. As for focal length, that is just a question of the lens itself, some lenses are sharpest at their widest setting, others in the middle and others on the telephoto end, there is no rule regarding that. Shutterspeed, well generally they say you should use either 1/focal length, that is if you shoot at 200mm you should use a shutterspeed of 1/200 or faster, that or don´t go under 1/60 if you are shooting wide but again. Then there are some that say double that, shoot at 1/400 if you are at 200mm and so forth.
Not perhaps answering your question as you asked for tests but I don´t know any of those, have never put any of my equipment through any test of any sort, I generally find rulers and newspapers to be boring subjects :P |
