Originally posted by insanoff The concrete lens is necessary to me.
I hope you don't mean ferro-cement! The boats don't sink, but the lenses are heavy.
Anyway, the point is that there is no single 'landscape' prime or zoom size. If you look at collections of varied landscape photos, you'd find that most were shot at the equivalent of 18-55mm. Add coverage from 70-200mm for distant scenery, and you've got 99% of landscapes.
I own and use and love the Zenitar 16/2.8, but it is NOT much of a landscape lens. It pulls a close subject forward and pushes the background away. Unless you keep the horizon line centered, you get great distortions of earth and sky. These can be fascinating, but they'd better be less important than the close subject, or they twist your eyes out. Not that I'm totally opposed to eye-twisting, mind you... Of course, I live in a forest, and seeing all those trees falling over in the fisheye just fills me with fear.