Canon vs Tamron. It's shootout time!
The Tamron 150-600 weighs in at 1.9 kg, about 700g more than the Canon 400mm F5.6.
A field test was done with a Canon 5D MK3 and a 70D.. I have my trusted eight-year old Canon 400 5.6L for field comparisons at the 400 range to test against the Tamron 150-600. This is NOT a detailed scientific test and does not pretend to be one, just a hands-on field approach as in real world photographic situations. No charts were used. No tripods were used, all shots taken hand held.
I had this lens for a couple of hours wandering around the park, looking for subjects. Unfortunately, there weren't many birds ... Only a pair of captive black swans, two free flying herons in the sky and hundreds of people.
There were four things in my mind when I had my hands on on this Tamron 150-600mm F5-6.3 VC :
1) Image Quality*
2) AF reliability and tracking capability
3) Image stabilisation
4) Built quality
*I encourage you to view the files at 100% crop. Make your own judgement. Micro adjustment is available for the Tamron 150-600 on the Canon 5D mk3 body. In my hands on field test, both the Canon 400/5.6 and Tamron 150-600 were set to "0". I did not manually focus.
Picture by Zhou Jie taken with an Apple iPhone 4s.
From Tamron 150-600 VS Canon 400mm F5.6L SHOOTOUT!!!