Has anyone here used either of the 500mm lenses? There is the APO (about ten grand) and the normal one (about $1300, or $500 used). Obviously there would be a lot of difference, but has anyone used the cheap one and have any comments about it? I only need a longer lens 2-3 times a year and can't justify the APO lens, yet don't want to shoot with a coke bottle as a lens.
Same deal for the 300 - there is the 2.8, the 4.5, and the 5.6. Has anyone used the 2.8 with the 2x converter, and is it a decent combo, or does the 2x bring it down to junk? I assume th 5.6 is pretty marginal, however what about the 4.5, which seems to be a good lens on paper (and is actually AF too, which I don't need, but is a newer design) - can anyone comment on the 4.5 with and without the 2x? There are no dealers in my part of the country so no way to have a look in person at any of this stuff, so I will have to buy blind...Thanks for any thoughts...