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mark fadely wrote:
I own the MKIV, and yes, it's better, but I feel like I could pretty much shoot anywhere with the MKIII and fast lenses as well.
I understand the spirit of what Mark was saying and yes it would apply to 95 percent of venues. However I have been in several situations where that just is not the case.
My home HS football field (Dallas) is ISO 3200, F2.8, 1/500 or 1/640 between the 30 yard lines. The closer you get to the goal line the darker it gets. (Two light poles on each side of the field on about the 20's, but most lights aimed to the middle of the field). If you are shooting a goal line play from the end zone you are at about 1/250 at ISO 6400. So with the 1D3 maxed out you get motion blur. If you were shooting with the 1D4 at 12,800 you would get above the shutter speed threshold to stop motion.
Before our HS got our lighting upgrade in the gym it was pretty much the same situation as on the football field. To get acceptable detail and noise level and skin that didn't look plastic, I felt I had to shoot at ISO3200, and at that ISO the shutter speed was marginal for stopping action in that gym. With the 1D4 I got shots at ISO 6400 that were cleaner than the 1D3 at 3200 with more detail. And of course that one stop of ISO is the difference between 1/250 and 1/500.... which is the difference between motion blur and almost no motion blur.
Ditto for many middle school basketball gyms which often have less light than the local HS gyms. And ditto for my friend's daughter's club volleyball practice facility, which is the darkest gym I have ever been in.
There are four examples of locations where a 1D4 gets quality shots that a 1D3 won't get.
So if you never shoot in locations like that then save the $ and shoot with a 1D3.
EDIT: To clarify, I use F2.8 lenses on the football field, and the 50mm 1.4, 85mm 1.8, and sometimes my 70-200 2.8 IS II in the gyms.