drisleydrisleyWhat a Tool I am8,754 postsJoined Nov 2002MORE INFOThankyou very much for that review Scottes.I have been contemplating gettting either the 100-400mm zoom or the 400mm prime, and I think the prime may be the way to go for me.One question... do you think at 400mm that an aperture of f5.6 is enough to blur the background sufficiently to isolate a subject, such as a person that fills th