Thanx Pixie. It is somewhat ironic that I get the best IQ out of 7D in shots with relative proximity to target (assuming low and moderate ISO values). The depth of detail that 7D generates in those conditions is peerless. However, I haven\'t had much success with it on long range shots even at low ISO values. The primary problem was inconsistent and sloppy AF, such as missing a bird and focusing on a branch behind it. That trend was so clear cut, that I had to drop 7D from long range shooting applications altogether.
I have seen that as well, in AI Servo, the 7D, with certain lenses, is \"twitchy\" for a lack of a better term. What AF mode would you be using in those cases, and I would assume you would have been in Servo for those? I am wondering if spot AF would work better in those cases, if you weren\'t using it.
Twitchiness is perhaps one aspect of it. Much of what I shoot moves, flies or swims, thus I have to use servo AF much of the time. In addition, I\'d use spot AF on stationary targets, but not on moving ones where speed of AF is of some importance.
Generally, if I had to, I\'d use 7D for BIF too despite a higher incidence of sloppily focused/softish shots, such as one shown below, compared to 1DsMkII or 1DMkIIN. In fact, I do not even expect 7D AF to perform similarly to those cameras, I have been satisfied enough with my 7D AF if only based on it performing better than my 40D AF.
Sep 06, 2012 at 09:38 AM
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