With respect to Alan Gibson's answer, that when you tilt a telephoto lens it will also involve a shift and bellows movement, what is the practical effect? In other words, one you get used to it, is it still difficult and very cumbersome to tilt a telephoto lens, or is it a merely a minor inconvenience that you essentially forget about once you've done it a few times? Also, assuming that the optical quality of the telephoto image and the normal image (i.e. 300 M f/9 Nikkor) are the same (which I understand they won't be), does tilting a telephoto lens somehow degrade the optical quality of the image? Thanks.