I am still debating between the 100-400mm and the 400mm. I must decide soon because a great horned owls nest has been spotted and I really want to get a shot of those adorable downy balls. The lens is going to be used outdoors on active wildlife, alot of birds, etc. My concerns are sand, sand and more sand. I live in a sandy environment, my camera has sand on it now. The push pull on the 100-400 really concerns me, I am afraid sand will get inside my camera. I've read some of the discussions and reviews on this site.
Also, the rotating zoom friction adjustment collar, I've read in some reviews on other sites the adjustmant collar doesn't hold tension properly.
Would you mind telling me your experience with these lenses?
will air in a can be best for blowing sand off my camera or will the ones you squeeze with your hand, they come in three different sizes (i forget the name) do just as well?
Thank you,
naturac