Sorry for the weird inclusion "Already" in my message - dunno where that came from...:dunno:
What I'm trying to say is, do a check on your D90's 3-inch screen carefully first before calling it a day (on the spot). Not coming home and then find out too late that it's not good enough. On the 3-inch screen, I usually zoom in until close enough maybe enough to see the whole eye on 3-inch (depends on how far is the subject)...no need to zoom all the way in. That would be pointless and you'll see all the fine dots and pixies having a party (nothing will be sharp at that level, too micro already)... Roughly about 4 to 3 levels before the final zoom level should suffice. Like I've said, if the eyes are sharp (try checking for both eyes, if not the closest eye) your portraiture shoot more or less can be called a day... Then of course, this maybe considered pixel peeping already. Sometimes, if it looks sharp at 5th level of zoom, it is probably good enough for a sharp 4R print. ZCA and DD123 (die almost typed BB123) please correct me if I'm wrong. But we all aim to go sharper close to the 4 to 3 level of zoom from the 3-inch LCD, right? Yes, at 100% zoom on your PC screen as well.
To crop at 100%.... check at what percentage the image is being viewed at first... when you see 100% viewing (should be indicated somewhere on top for most softwares), you start cropping the area that you have moved into (using "hand" icon). Normally at 100%, the image (provided you use the largest format provided by D90) is going to be much much bigger than your screen size... Normally, we set our PC screen at 1280 X 1024 (or thereabouts)... The largest format on D90 is shot at 4288 X 2848 (uncompressed 100% resolution). Do the math, how is that going to fit into 1280 X 1024 screen without making the image smaller than 100%? :bsmilie: So when we start viewing the image at 100%, naturally you won't see the whole 4288 X 2848.