John Navitsky
Well-known member
@eaj101 i think the driving factor typically should be what focal length you need most of the time. if you don't need more than 400mm, then the 100-400 is probably going to be a better choice. but if 400 is too short, the 100-400 is probably not the best choice. if you don't need a zoom and you need something around 400, the 400 4.5 looks more attractive.