I understand you would shoot 24MP in the D7100 if you wish to print enlargements over 8x 10. What would you recommend if the goal is to project the photo on a large screen HDTV? Would you really notice much difference in a 15MP copy vs 24MP for projection purposes? I would be shooting using the 1.3 crop mode at Jpeg fine Large. (I have the D7100 on order).
#4. "RE: 24MP vs 1.3 Crop mode for projection on HDTV" In response to Reply # 0
Most HD TVs are showing something like 1388x768 (about one megapixel) or maybe as much as 2500x1900 (about 4mp). So you will see very, very little difference if your original is 15mp as opposed to 24mp - either way you are throwing away the vast majority of the information. If you downsample to 1mp, you'll be tossing 95% of the information, while you're downsampling "only" 92% if you're coming from a 15mp original. For net results, you would do about as well with the same lens on a D2h (4mp) or even D1x (5mp).
For a little perspective, an image printed on 8x10 at 300 dpi is 3000 x 2400 or a bit over 6mp - even at 8x10 you are throwing away 75% of the information.
If you print the 24mp file natively, you'll get a 20x14" print. Since it is easily possible to make a very good 24x36" from half the pixels (12mp) by using good post processing and printing technique, the 24mp cameras can clearly go much bigger. If you use the 1.3x crop mode, you'd lose a quarter compared to these numbers, but pretty obviously if you're using a HD projector, a D7100 is a massive overkill. (That doesn't mean it's of no use, just that for this application it is killing a flea with an elephant gun. An elephant gun is still very handy if you're being charged by a tyranosaurus or even a sabre tooth tiger!)
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!