Hi, I have seen many posts here saying, don't get a tele lens. That if you have the bellows draw, get a long lens as opposed to a telephoto lens. That tele lenses aren't as sharp or good as non-tele lenses of the same focal length. But why? In 35mm, the big glass of Canon and Nikon are the finest. According to tests they beat all other types of lenses. They are as good wide open as stopped down. I am refering to lenses like the 200/1.8, 300/2.8 and 600/4. In fact according to "photodo" the best lens they have ever tested is the Canon 200/1.8. And all the other big glass are pretty much runners up. So why is it in large format tele lenses are so down played? Thanks!