I don't do a huge amount of long lens shooting, but when I have I've found that 70mm is too long as a zoom starting point on my APS-C body. So I've been thinking of swapping my 70-300mm IS for the 55-250mm IS. The main thing I'm interested in is comparing focus speed and accuracy. Obviously the non-USM 55-250mm is slower focussing, but how much of a real-world difference did you find it made? Was it any less accurate? I'd mainly be shooting motorsport and the very occasional bird with it.
(What I'd really like is a USM version of the 55-250 IS, still EF-S, and while I'm dreaming why not constant f/4 with a non-rotating front element. I would think it would have a market too, for all those 7D users using it for sport.)
(What I'd really like is a USM version of the 55-250 IS, still EF-S, and while I'm dreaming why not constant f/4 with a non-rotating front element. I would think it would have a market too, for all those 7D users using it for sport.)