Thanks again...
Could I ask which 1.4 converter gives you auto focus on the 50-500 as my sigma does not and the canon converter's i have do not fit the sigma..
I do go birding some times, but I suppose what a really need is fast 2.8 or less for the theater stuff. reach can be either 3-4-or 500 I guess I am happy with my current body although dust is a constant problem and needs regular cleaning. reviews give the 300 2.8 as the best image quality even with a 1.4 it is supposed to be good, what ever i get i will probably get the 500 at some point,, so I guess it is between the 3oo and 400 2.8 I already have sturdy tripods..
thanks again for your views..
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