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Best zoom lens for birds in flight because of push - pull zoom
Heavy, push - pull zoom can suck dust inside
I'm owning this lens for about 7 years and still thinking that it is the best lens for birds in flight. That is because of its push-pull zoom. You can find the bird in the air on 100 mm and change the focus lenght to 400 mm immediadely by pushing it forward.
I tried 3 copies of this lens in the shop and found that 2 of them had very bad IQ and were blurry but one copy was brilliantly sharp and gave very good IQ of the photos on my Canon 60D. So I bought this one.
The lens is sharp on 400 mm from 7,1 aperture on my Canon 60D. It is less sharp on 6,3 aperture.
I've read about the sucking dust ability of the push - pull zoom of this lens. But I've got just few specks of dust for 7 years of using it.
Tried it with Canon 7DMk2 and got bad focus and bad IQ. Had the same result on this camera with Tamron 150-600 G2. Probably I have the bad copy of Canon 7DMk2 or just need to adjust the focus for this lens in Canon 7DMk2.
Overal - highly recommended lens if you find a good copy that suits your camera.