I have just bought a second hand D200 in very good condition to use with my old lenses that I combined with a FG film camera in the 1980s. I made the mistake of buying a D60 a few years ago not realising it would not be back compatible. I have read everything I can, including the article on this site i.e. I have set the focal length and maximum aperture (135, 2.8)as recommended, am using A mode, white balance in Auto, ISO-AUTO and still the photos I am taking are grossly underexposed. Am I missing something? Any helpful comments welcome.