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On a personal note, I've been looking at full frame samples quite a lot these days because I need to get really great ISO3200 and ISO6400 shots for a specific type of photography I want to explore (astroscapes). Full frame has an advantage, especially the 6D and D4/df but it's not miles apart if you use the right lenses.
For example, a wide angle (28mm and below) fast lens with minimal coma and vignetting is really what's needed. All the great wide angle lenses perform pretty terribly on FF on the corners except the hugely expensive and literally huge Nikon 14-24 and Zeiss 21 (it does worse here a bit due to high coma). Everyone else needs to be stopped down from F2.8 and that's where you lose the stop performance advantage of FF. On APS-C the very large Sigma 18-35 F1.8 and smaller Fuji 14mm 2.8 are probably the best balance I've found in measurements and tests that can match the performance of something like the tiny Olympus 12mm F2 that show almost no coma and relatively lower vignetting. The Fuji X-Trans is an intriguing possibility for astroscapes because of the very low chroma noise. (However, in everything else you have to deal with a modified workflow for post processing and still other lingering issues, something I'm not sure I want to do.)
I've also looked at the Sony A7R and it's really poor for this kind of photography and in general is of questionable value. Sure, nice small body but bigger lenses are required, it has the worst AF by far of any FF camera, has light leaks, and Sony has yet to release a great wide angle lens.
So it's really a question of how much do you want to spend in lenses, how much size do you want to carry, and a couple of other factors. Unfortunately the answer is never easy.
Ideally, I want a 6D sensor in a GM-1 body with lenses the size of the Olympus 12mm at the cost of a E-PM2.
Edited on Mar 31, 2014 at 06:07 AM · View previous versions
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