That is exactly the question I had as I unpacked the new Nikon D80 and charged the battery. Just how big a deal was the 10 mp sensor compared to the 6 mp sensor in my D50? I put one of my lenses in the light tent and made an exposure with each camera, recording the image in NEF or the Nikon RAW format. I used the same lens - a 17-55mm f2.8 Nikkor zoom - and the same memory card. I then made a significant crop of each image and enlarged the results to an 8" wide JPEG for viewing on a computer screen. I used a little compression to get the file size reasonably small but not much. I did exactly the same thing to both images. Then I made an extreme crop to show just the 12-24 numbers. I enlarged those to an 8" width so I could see what was going on. Here is the image with the results. At the top is the original shot made with the D50. Below that is the first crop and the extreme crop from the D50 image and then the first crop and the extreme crop from the D80 image. I can just begin to see a tiny bit of pixelization on the extreme D50 enlargement but none in the D80. You can tell me what you think but I think the images are comparable enough that the increase in sensor resolution was basically insignificant. In truth, I expected more difference but I really don't see it. My conclusion is that once you are at 5 or 6 mp you are pretty much good to go. Beyond that, the improvements are subtle at best. Comments?