jdramirez said:Correct me if I'm wrong, but a ff option does bring out more vignetting which isn't the biggest problem in the world, but it can turn a good ef lens on a aps-c into a pain to edit on a ff.
For a given lens that's true, but that's a property of wide fov lenses, not full frame. To compare apples to apples, you need to compare equivalent focal lengths (same fov) and either optimal apertures on both bodies, or "equivalent apertures" (e.g. to take into account that you can stop down a bit more and bump ISO if necessary on full frame for the same depth of field and comparable image quality)
Once you do that, it becomes much less clear that you'd expect more vignetting on FF. One thing that you do gain is that Canons wide primes are all FF lenses (and some of these, such as the tilts are outstanding). There's little point (in my opinion) in APS-C users going with FF primes wider than about 35mm because you're paying a staggering amount of money to cover a wider fov than you need.
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