My guess would be the weather sealing. Probably a rubber o-ring or gasket creating a slightly spongy feeling.
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The Cadillac of the stitching programs is Photoshop if your budget can afford it.
Many of us, in contrast to moocowe, have found that we have to take several shots when doing bird photography with the 7D to get tack sharp focus whereas the 5D III is spot on every time.
for 14-24mm f/2.8
I would buy, if this lens accept regular (100mm) filters, I already have a filter collections, that's already very expensive. I wouldn't buy larger filters (>150mm) cuz they're insanely expensive.
I find the ability to use a smartphone for tethered shooting (eg. star timelapse from inside my tent & awkward anglesi) , video monitor (albeit a small one, eg. the "missing" articulating LCD on my 5D) and so on.
1, The focus dots will suddenly blink in red with out touching any button. Just like you are moving the camera around and suddenly it will blink with no reason. (I am on auto focus mode) happens once a while.