90D + Tamron 150-600 g2

Started Oct 11, 2019 | Discussions thread
John Sheehy Forum Pro • Posts: 24,347
Re: 90D + Tamron 150-600 g2
1

thomste wrote:

Yes I have a 70-200 2.8 too and it is a great lens but too short for birds.

Im considering the 100-400 too but Im not sure the AF would be that much quicker with an 1.4 extender? I find the 150-600 image quality very good on stationary or slow moving subjects. I just need a faster AF lens.

Anyone tried the 100-400 with a 1.4x on the 90D?

AF is not just about f-number. There's the fastest an AF drive can move, and there seem to be other optical variations which seem to affect AF.

The Canon 100-400 II seems to be one of those lenses that AFes much better than the f-number would suggest, compared to other lenses.

My 400/4DO II with the 90D pops into focus with the 2xIII at f/8 faster than my Sigma 100-400 at 400/6.3, even with 1.26x the f-number, and even in low light. I like the Sigma optically, but in deep shade shooting dark things, the AF takes much longer.

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