do you mean a 100% view of the photo taken?
there are a total of 8 diff levels zoom in playback regardless of photo size, i believe that the max zoom is the 100% view of the photo, not too sure tho, i just compare the max zoom of the photo in camera screen with original size of the same photo on computer screen, the size and details are similar, thanks to the high resolution d90 lcd screen.. :lovegrin: there are slight differences but i think that shld be due to my old comp screen... ;p
not sure whether this is wat u asking for... but just enjoy shooting... d90 is fun!! ;p