Bob Atkins , Aug 12, 1997; 12:19 p.m.
Any lens is capable of "professional" results, since:
- (a) It's a totally meaningless term.
- (b) It's the photographer that counts.
- (c) For small prints, almost any lens can produce marketable images.
Informed opinion suggests the 135-400 is good at the short end and usable at the long end. At 400mm it isn't as sharp as the Sigma 400/5.6 APO Macro. If what you really want is a 400mm lens, buy a 400mm lens!
This is not a lens for a pro who is attempting to make a living via nature photography. It's OK for an amateur who wants decent images and isn't going to be shooting at 400mm all the time.
These comments also apply to most of the other similar lenses (80-400, 200-400 and so on).