As for the 170-500mm again no real experience with but if its EX you cant really go wrong.
In my opinion i would stick to the EX Sigma range rather than look at the Quantaray range , now i have no experience in the Quantaray range i really dont have an accurate view but i havent heard very good reviews .
On separating the 2 lenses i used its a very difficult choice as the 50-500 had pretty much the whole range you would need but the 100-300 has the lower light capability therefore slightly more usable.
The big issue on this subject really is funds , as the Sigma EX range i would guess will cause more of a hole in your pocket
Hodges From United States of America, joined Mar 2004, 138 posts, RR: 3
Reply 9, posted (9 years 10 months 4 weeks 1 day 9 hours ago) and read 2115 times:
You might want to look into buying Sigmas new 80-400mm OS lens. I've heard some pretty good things about it. And it only costs a little more than the 50-500mm plus you get Sigmas optical stabilization.