I can afford one more long lens and I'm trying to decide which to buy.(No interest Sigma or Tamron)
re: the 500mm seems the most practical. Handheld and with the 1.4 TC a serious contender for reach.
re: the 600mm. Great lens but most of the folks out there tell me that they need a tripod and I don't see huge differences over the 500mm with a T.C.
Finally, the 800mm 5.6. Needs light, great reach and about the the same with a 600mm +1.4.
Owners, users, please respond.
If you own or use on a regular basis a 500mm (+ TC.), 600mm (+ TC ) or 800mm...please respond if you have some useful experience to add.