Thern wrote:
sk66 wrote
I'm not trying to make a big deal of it, all of the long zooms currently available exhibit similar performance. Well not all and focus breathing like the 70-200II showed or the current 120-300 shows was/is a big deal.
All of the 150-600 options show similar focus breathing being around 500mm @MFD, and the 200-500 is around 400mm @MFD (from what I have found online). My 120-300 is around 240mm @ MFD (C version)... my 70-200II is probably the worst of the bunch that I own personally, but it also has a shorter MFD.
I think focus breathing is a more significant factor with shorter lenses because any losses are a greater percentage off of the maximum/reported FL. But just as relevant is how the lens will be used... if it won't be used for shorter distances then it really doesn't matter much at all.