Comments on: SONY a7r iii for Flight Photography? https://www.birdsasart-blog.com/baa/2019/09/29/sony-a7r-iii-for-flight-photography/ The blog of bird photographer Arthur Morris Tue, 01 Oct 2019 13:27:13 +0000 hourly 1 https://wordpress.org/?v=6.8 By: Arthur Morris/BIRDS AS ART https://www.birdsasart-blog.com/baa/2019/09/29/sony-a7r-iii-for-flight-photography/comment-page-1/#comment-1767085 Tue, 01 Oct 2019 13:27:13 +0000 http://www.birdsasart-blog.com/?p=63749#comment-1767085 In reply to Fred Innamorato.

Adding a TC to any lens will always slow down the speed of initial focusing acquisition and decrease AF tracking accuracy to some degree. Why? AF depends on light and contrast to focus and a 1.4X TC robs the system of one stop of light while a 2XTC robs it of 2 stops of light.

My experience shows that SONY is less affected than Canon and performs quite well even with the 2x (on an f/4 lens of course …) . Nikon can do pretty well with the 1.4X TC as long as you stay with a center AF point …

with love, artie

]]> By: Fred Innamorato https://www.birdsasart-blog.com/baa/2019/09/29/sony-a7r-iii-for-flight-photography/comment-page-1/#comment-1767010 Mon, 30 Sep 2019 18:02:20 +0000 http://www.birdsasart-blog.com/?p=63749#comment-1767010 Hi Artie. Does the addition of the FE 1.4x Teleconverter in your opinion slow down the Auto focus significantly? I used the Sony a9 with the FE 100mm-400mm at closer distances for Warblers feeding with the 1.4x recently and had trouble getting the AF fast enough. I will try it without the 1.4x this week and compare myself. I lost several shots so maybe it is not worth going for more reach?

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