This is probably old information for most of you but it's for me it's the most important thing I got out of the Nikon training day for the D2X. I hadn't realised before how inportant it is to nail exposure in the camera. My method generally has been to avoid blowing hightlights and (secondarily) to try to get the histogram as far over to the right as possible. But often, I've settled for a histogram mostly over to the left and thought "I'll fix it in PS later". A phrase the trainer said was amongst those he hated most. The revelation (for me) was how much of the information resides in the right hand side of the histogram. Forgive me if I don't use technically correct terms and express myself badly - I'm not a technical-type person. As I understand it, it goes like this. If you mentally divide the histogram area into 6 zones (roughly corresponding to the 6 stops the camera can handle), then starting from the right, each zone contains twice as much information as the one to its left. This means that one half of all the available information is recorded in the 1 sixth area at the extreme right of the histogram. The distribution is as follows, starting from the left (darkest area) when shooting 12/16 bit. 1 64 tones 2 128 tones 3 256 tones 4 512 tones 5 1024 tones 6 2048 tones Adding up to the total 4096. So, if you shoot so conservatively that there is no recorded information in the far right one sixth of the histogram, you have effectively excluded half the possible information. So when you adjust levels in PS, you are stretching the 2048 tones you have actually recorded over the range which might have captured 4096 if you had exposed a little more to the right. As I say, it's probably old news to the people I so admire on this forum, but I feel like Archimedes getting out of the bath. I'm sure there are people who can comment more knowledgeably on this and correct me where I have not properly understood.