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Bought this lens for bird photography about 6 weeks prior to writing and to present used it on small birds.Smooth zoom action, quiet autofocus being HSM. Relatively quick af which is also accurate.Quality of image on ff is very good although since I have not used any of the Nikon long lenses cannot compare it with them. When used with a modified Nikon 1.4 teleconverter cannot see any image degradation although af is lost (manual focus only).It does in fact take the tc better than my Nikon 300mm f4.At minimum focusing distance (20feet)with the teleconverter a robin occupies about 60% of the frame.You could obtain slightly larger magnification with a dx body and no tc. The only downside is the weight at over 13lb (about 6kg).You need a solid tripod and gimbal to use it but with the right technique good images can be obtain down to 1/100 second.Read full review
this is the ultimate lens for wildlife photography , optically it is on a par with nikkor and canon 500 and 600 f4 lenses . i have the nikkor and can see no difference . the posatives are the zooom flexability ; track a moving object at the 300 mm end and then zoom in . much easier than with a fixed focal lengh lens . ALSO with digital cameras you are not advised to chage lenses too much when in the field due to the dreaded dust on the sensor issues . so whilst a prime lense with a 1.4 , 1.7 and 2 x convertor might cover a similar range the sigma wins on use in a practical sense . your kill rate goes up . on the negative its heavy , with a pro body and big gitzo your looking at 30 lb on your shoulder . being six foot plus and having a gym memebership is as essential as a lens cleaning cloth !!. but money well spent . forget the Canon mikon snobbery i have many nikkor lenses and the sigma 300 -800 is exceptionalRead full review
