400 v 600?

Started Jul 18, 2014 | Questions thread
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400 v 600?
Jul 18, 2014

As I grow nearer to ordering the Tamy 150-600, I would like to ask, how great in real life shooting, [wildlife & birds,] is the difference between 400 v 600? I have a Sigma 120-400 OS, which I can use fairly effectively, but the extra reach of the Tamron sounds tempting, + it's a price I can afford. I don't want to hear percentages, but if anyone has photos shot at 400 & 600 preferably of the same scene, it would be very helpful. I will be using a 7D. TIA.

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lee uk.
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 happysnapper64's gear list:happysnapper64's gear list
Canon EOS 5D Mark II Canon EOS 7D Canon EF-S 15-85mm f/3.5-5.6 IS USM Canon EF-S 55-250mm f/4-5.6 IS Canon EF 100mm f/2.8 Macro USM +9 more
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