Thanks for the replies. I left out some important information... I have lenses covering up to the 200mm range, and I even own the 135mm f/2.8. It is a very good lens indeed! I'm looking for 300 to 400mm range for birds. I have an old Solagor 400mm lens which is more like the bottom of a coke bottle than a lens! Chromatics are terrible! Just look at my bird picture in the 365 project for a sample!!!
I can't afford the fast nikon 300mm lens, it costs more than my whole kit! I don't know how good the mirror lenses are, never used one. Not sure if ANY third party lens would be much better than the Solagor... so... are there any options with decent quality at, say, $300 or less? (Used of course)
Thom