Originally Posted by
DavidEccleston
AF tracking depends on a lot of variables. Focus tracking at short distances is hard. Hopefully Brant can fill in some extra details on what sort distance and lens combo was failing. A pug is on the smaller side, so may require an even longer focal length to fill a reasonable portion of the frame without being "too close to track" for the same zoom lens.
From my 7D, 7DII, and 1DsII experiences, tracking a dog running towards the camera, in good light:
with a 50mm lens... missed AF is expected.
with a 85mm lens... AF is hit and miss.
with a 200mm lens... missed AF is unexpected.
From my experience with a Rebel T1i, tracking a dog running towards the camera, in good light:
with a 50mm or 85mm lens... missed AF is expected.
with a 200mm lens... AF lags. Expect blurred heads and sharp tails.