EricI think your analogy with identifying birds is a good one.I'm sure, everything else being equal, that having twice as many mp on the subject can only help.I guess some bird people sometimes just want to know what they've seen (or are looking at) but there's not really a chance to make a pretty photo.On the other hand, 100% more mp is going to allow a modest crop to show more detail and retain more IQ than the same crop from a camera with half the mp.I was really just wanting to know how many extra mp would be needed before a useful improvement was gained. Sounds like going from 12 to 24mp might do the trick but 12 to 14 or 18mp probably wont.The 36mp D800 isn't likely to be any benefit to me over the D700 as I never need to crop it's pics anyway. I use it for closer in targets. If the subject's far away, I'm already using the D300s.A 24 mp DX camera, on the other hand.....could be real useful.
my webpage is at http://www.scottishops.co.uk my Nikonians gallery is here. http://images.nikonians.org/galleries/showgallery.php/cat/500/ppuser/330319
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