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Hi, Recently I seem to have problems with the autofocus of the D90. The image taken isn't as sharp as before. Anybody has issues like this as the D90 ages? I read online that D90 does have some focusing issues and that there isn't any built in adjustments that can be made. Anybody tried...

Hi, I just started on photography and was comparing lens available to go with the DSLR. From what I have been reading, the two key characteristics of a lens are its (a) range of aperture size (denoted by f, the smaller the number, the bigger the aperture); and (b) the focal length (which...