Quote:
Originally Posted by HPFREAK
Ya the 2nd one was not my fav either but I figured I would post it. I did have it in AI servo but it kept back focusing and hunting. Honestly the T2i is not good with the AI servo I found and others say similiar. I used AI focus and one shot. The best results were with one shot center point selected. If I use the entire selection points in the AF selection point screen the camera just gets the focus wrong most of the time and can not get it unless the contrast is really good. I was told by a few people on the canon forums that center point is the best to use undless the camera has a really fast AF system like the 7D with all cross type points. Since the T2i only has the center point as cross type it is pointless to use all selection points or evaluative metering in most situations with moving targets. I was focusing on the Hawk then bumping the focus a few times to get it right. This only worked a few times to get it right. Next purchase was going to be a 7D but I am going to get the 100-400L for the reach, and then rent a 1.4 TC. I know they can degrade IQ and I have seen the result, but I also saw a guy yesterday post some amazing results with his 1.4 and 100-400. He said that once he stopped going all the way to max zoom and back it off a tad to 530mm instead of 560 the results were far sharper.
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I owned the 400mm f/5.6L before I bought my 500mm f/4L IS. The problem with the TC is that the AF will be slow to nil with it because f/5.6 is the limit of the 7D's AF system. Both the 100-400mm and the 400mm are great lenses, but you can't use a TC on them for anything that moves. I taped my contact points so that it'd try to focus, but gave up after a couple of outings.
I would, however, suggest that you buy a 1.4x TC and use it on your 70-200mm. When I go for wildlife and birds, I take the 7D with the 500mm and the 5D2 with the 70-200mm f/4L IS plus 1.4x TC mounted. I shoot anything too close with the 70-200/TC rig. If I need 700mm, then I move the TC over to the 7D/500mm combo. Since both my 70-200mm and 500mm are f/4, they respond "well" with the TC. "Well" doesn't mean fast, but I can AF on slow movers like hawks and eagles while hand holding the 500mm plus TC. Fast subjects, like most ducks and all pheasants I've encountered, mean working without a TC.
If, if your 70-200mm is a 2.8, then you can use the 2.0x TC on a 7D and I'd suggest buying both a 1.4x and a 2.0x, but get the Series II version of the 1.4x and the Series III version of the 2.0x, if you can afford it.
Dave