splathrop Offline Upload & Sell: Off
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Just perused the thread looking for examples of challenging focus tracking using f/8 lens combinations, such as 100-400 II with extender 1.4, or 400 DO II with extender 2.0, for birds in flight. Not much of that showing. I'm curious if 5D IV users who have those combinations available aren't using them for that kind of image because they feel the camera gives up too much autofocus performance to meet such a stiff challenge.
Using my 5DS-R plus the 100-400 II and extender 1.4, I get what feels like almost-adequate focus tracking on big steady flying targets (blue herons or eagles, for instance) if I catch them in better-than-marginal light—which is pretty restrictive. With faster-flying, smaller targets, that combo is very iffy—without great light, almost hopeless, actually.
So, because I have plenty of fast-flying sea ducks to shoot in dim early morning light, I'm trying to answer the question of whether adding the 5D IV would much improve capabilities. Any experienced-based insights much appreciated.
One helpful way to frame the question: in what conditions does the superior autofocus of the 5D IV—especially when used with f/8 lens combinations—deliver enough extra sharpness to offset the resolution advantage of the 5DS-R. If that sounds like muddling the categories, it is. But I think for images I get now which are almost-but-not-quite critically sharp, the muddled frame of reference may be helpful—lower resolution but critically sharp images might be preferable. Here is an example of the problematic kind of image I'm talking about:
Great Blue Heron
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