Who buys the 300-800mm, will be mainly active in animal photography. To this end, the objective is also very well suited ... its focal length range is truly amazing, just for bird photography. Unfortunately, this is but the AF part too slow or can objects that are small poor focus (despite 1DX). The image quality is not quite as strong as with a Canon 600mmf4, but still at a very high Nivau. The more the winding to sun ensteht unfortunately "Lensflair" So reinfection to Liesen.
Conclusion: Sigma makes almost everything right, only the "outdated AF" and the slightly inferior image quality giving each a star deduction.
PS: In the meantime I switched to Sony .... unfortunately there is not this lenses for Sony cameras, which is ridiculous, because the lenses is also available for Sigma cameras and this just "1" camera in your line-up have , Sony only 20 could be USER with the lenses ....
