There’s been a lot of interest in the newly released Tamron 150-600mm f/5-6.3 SP Di VC USD lens. (For those wondering what the initials mean, VC means vibration control, the others all read ‘marketing drivel’.) But meaningless initials or not, with a price under $1,100, a superior range, and vibration control, this lens has created a lot of excitement.
Recently, the good people at Imatest have developed an ultra-high resolution, backlit chart printed on photographic film that is perfect for testing long telephoto lenses in the lab. The combination of a new, cool Imatest setup and a new, cool lens proved irresistible, so we decided to compare the new Tamron with the older Tamron 200-500mm, Sigma 50-500mm OS, and Canon 100-400 IS lenses...
The bottom line, though, is at 400mm the Tamron 150-600 VC and Canon 100-400 IS are virtually identical, with the Tamron 200-500 and Sigma 50-500 a bit behind. Let’s keep it in perspective, though, both the Sigma and Tamron 200-500 are still very good at 400mm.
(As an aside, because I expect it will come up in discussions, there are a number of people on the internet who say their Canon 100-400 isn’t as sharp at 400mm as it is at shorter focal lengths. My experience is this usually means a slightly decentered front element. Good copies are equally sharp throughout the zoom range.)