privatebydesign said:Anybody that is still sprouting the 'megapixels on duck' fallacy has clearly never actually tested same generation crop and ff sensors against each other in focal length limited situations in anything but the most optimal of conditions.
I have tested a 5D Mark IV (friend's) versus my own 80D, using a Sigma 150-600mm shooting eagles, to assess whether I wanted to buy a 5DMk4 this season. I took about 500 pictures from each n the same, sunny afternoon at the same reserve. All stills were on-tripod, and most in-flight were handheld. There's absolutely no question that you get more megapixels off the 80D.
YMMV -- Subjectively, I think the 80D is a better tool for this specific job, if what you want is more megapixels and you're unable to get closer to the subject. In ideal shots, where you're getting 3000+ pixels in one direction, it really doesn't matter. They're both spectacular. But when it's the difference between 2000 vs 1250 vertical pixels, it's the difference between a keeper and a throwaway. I'll bet you that if I posted 5 pictures and stripped the EXIF, you'd never be able to guess which was photographed with which camera.
Objectively, based on lab scoring (not mine), the 5DMk4 has slightly more color depth and the same dynamic range as the 80D, and much better low light (higher ISO) performance. But, if you're only shooting ISO 100 in bright sunlight, the latter doesn't matter. If you drop it down a notch and compare 6D and 80D, the 80D has superior dynamic range; who knows what the 6DII will bring.
The bigger sensor/higher ISO did prove to be a winner, when the 5DMk4 won out marginally for birds in flight when it was NOT perfectly sunny. In this situation, it was necessary to increase the ISO to get higher shutter speeds and also to shoot handheld. The problem? I usually didn't have enough focal length, and I probably threw away 200 in-flight pictures because the birds were just too small, sharp and beautiful though they were at ISO 300.
But at the end of the day, these are just numbers on a scale. The 80D is a very fine camera, takes wonderful shots of birds, and after exhaustively comparing both, and wanting to buy a new camera I could find no reason to.
I will almost certainly buy the 6DII. Will I use it for birding? I'll try it, and compare both with a critical eye. If the results are better, I'll use it. If not, I'll be happy to tug it along to shoot the trees that are filled with my favorite birds and sunsets, landscapes, and everything else, and shoot my eagles and owls with my 80D.
Anyways, TLDR, try to shoot some small birds from far away with a FF, and when they come out with too few pixels to keep, figure out whether you want to buy a 5DRS, spend an insane amount of money for a ginormous lens, or just use an 80D.
Sorry and TY for reading the long rambling
Now, I will shut up and go organize my gear for my birding trip tomorrow ;D
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