On this video comparison, photographer Toby Gelston takes a look at long zoom lenses and one prime including the Tamron 150-600mm, the new Sigma 150-600mm Sports version and the new Canon 100-400mm as well as the older Canon 400mm f/5.6 and finally the Canon 70-200mm f/2.8 with a 2X teleconverter.
This extensive video looks at several lenses and camera combinations. Gelston talks about the general characteristics, usability and finally value. Non of these lenses are bad (far from it) but each has its own advantages and disadvantages (it can be price for the Canon 100-400mm and weight for the new Sigma, lack of IS for the Canon 400mm f/5.6, or poor AF for the 70-20mm + 2X teleconverter or lack of weather sealing for the Tamron).
It seems that Gelston shot more wildlife than birds and for this type of photography the range of the lens is (sometimes) less important, however, if you are a bird shooter, trust us when we say that the longer focal range will come in handy (we are working on a review of the Tamron 150-600mm of our own and we did shoot a lot of birds with it).
More guides and comparisons of photographic gear can be found on our photography gear guides – here on LensVid.