My understanding is that when the photograph is saved to memory a certain amount of data associated with that photograph is also saved. Exactly what information gets saved? Im looking for data such as f-stop, shutter speed, iso, etc. Basically data that will help me to learn what works and what does not. How do I retrieve this data, do I need special software? Does it make any difference if I save as jpeg or RAW? Is there any way to embed the data directly on the picture, say on the bottom, so when I view or print the picture I can see the exposure information. Ive seen this technique used in books and brochures where picture looks like the view you would see through the cameras viewfinder. If it makes any difference the camera Ill be using is a Nikon D200.