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p.1 #3 · p.1 #3 · EF 70-200mm f/2.8L IS II + Extender 1.4x III or 2.0x III vs. EF 100-400mm f/4.5-5.6L IS for 7D | |
The 2x will obviously give you longer FL coverage, which is often desirable for wildlife shooting. Whether it will be enough depends on what kind of wildlife you plan to photograph, how close you can get, and your compositional preferences.
IQ with either should be acceptable, provided you use proper long lens technique and/or camera support, and allow for high shutter speeds (think 1/ 2x FL) when hand holding. You may find that you have to increase ISO to get the Tv up, and that could introduce digital "noise" into your 7D images.
As far as speed goes, you will notice a 50% decrease in AF speed using a 1.4x and a 75% decrease using a 2x.
My personal experience is that it is at least as worthwhile studying how to get physically as close as you can to your subject- keeping your safety and the wildlife's well-being in mind- as it is studying ways to increase your "reach".
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