New answers tagged optics
Yes they are. The only real difference is the primary lens mount and the AF system.
"Too low" is a very subjective term, but for using the lens on both a crop camera and on a full frame camera, the lens is sharpest in the range of f/4.0 to f/8.0 or so.
It is really rather simple. The diopter value will tell you how close you must be to the subject of your photograph, the farthest distance you can get a sharp image with the close-up lens on. you divide one metre by the diopter value to get the distance, which is the focal distance of the close-up lens. Hence a +1 lens will give a far distance of 1 m and ...
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