Here are some recent bird pictures taken with the trusty old EF 500mm f/4.5L.
I have found this lens to be a very nice alternative to the bigger, heavier and more expensive 500mm f/4L IS USM. So far I have found it very good for flight photography and not too bad to travel with. The only complaint I have at this time is that I am not able to get it to AF on my 20D with any 1.4x TC, even with taped pins. Aside from that I would say it is an outstanding wildlife lens. As I understand it the Sigma version offers very nearly the same optical performance but will work with 1.4x TC and taped pins.
Greg
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http://www.pbase.com/dadas115/
I have found this lens to be a very nice alternative to the bigger, heavier and more expensive 500mm f/4L IS USM. So far I have found it very good for flight photography and not too bad to travel with. The only complaint I have at this time is that I am not able to get it to AF on my 20D with any 1.4x TC, even with taped pins. Aside from that I would say it is an outstanding wildlife lens. As I understand it the Sigma version offers very nearly the same optical performance but will work with 1.4x TC and taped pins.
Greg
--
http://www.pbase.com/dadas115/