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p.1 #11 · p.1 #11 · 5D3 focusing at f/8 - How's the accuracy and speed? | |
Doctorbird wrote:
Very positive results here although some mention of the success rate would be useful.Db
Alan321 wrote:
More specifically, it would be worth knowing the success rate when the subject is approaching the camera as well as when the distance is relatively constant.
For me, success rate is highly subjective though and hard to quantify because it depends on whether your lens current focus point is near the subject bird or far.
Based on my experience, for the 5D3/400mm, I'd say if you can get focus on a bird that suddenly jumps up and takes flight across from you 9 out 10 without a 1.4X, you would get 7 out of 10 with it. Strangely for birds that come straight at me, it's easier, I'd say you would get 8 instead of 9 with the 1.4X on.
I occasionally take pictures of ospreys snatching fish...occasionally because it's fairly rare to witness such an event. I find getting focus lock on the osprey at the moment of snatching is challenging, even with a 5D3/ 400mm without the 1.4X. I would not use the 1.4X in this case as the success rate would be really low.
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