Would the big upcoming Alaskan cruise (in a week and a half) call for a 70-300L? My current gear is a T1i, Sigma 17-50, Canon 100 2.0 and 200 2.8II (and the associated goodness for waterfalls, bright light, etc.).
Also, would wildlife in bright sun necessarily call for a polarizing filter in many cases or are polarizing filters more of a landscape thing?
Thanks.