Comments on: Secrets to Success with the Hand Held 100-400 II/1.4X III Combination https://www.birdsasart-blog.com/baa/2015/08/13/secrets-to-success-with-the-hand-held-100-400-ii1-4x-iii-combination/ The blog of bird photographer Arthur Morris Fri, 14 Aug 2015 12:45:58 +0000 hourly 1 https://wordpress.org/?v=6.8 By: Joe https://www.birdsasart-blog.com/baa/2015/08/13/secrets-to-success-with-the-hand-held-100-400-ii1-4x-iii-combination/comment-page-1/#comment-1725276 Fri, 14 Aug 2015 12:45:58 +0000 http://www.birdsasart-blog.com/?p=28448#comment-1725276 Hi Artie, regarding AF speed, I read this from Chuck Westfall when comparing the 1DX, 5DIII & 7DII – “lens drive speeds will vary with all three cameras based on differences in optical formulas (for example, rear-focusing vs. full optical system extension, etc.). However, when all else is equal, the EOS-1D X and EOS 7D Mark II are capable of driving EF super-telephoto lenses faster than the EOS 5D Mark III, specifically during the first second of lens drive. This is due to differences in the circuitry of the camera body and these select lenses”
So it sounds like it’s not only the battery voltage that plays a big part in AF speed.

Joe.

]]> By: Geoff https://www.birdsasart-blog.com/baa/2015/08/13/secrets-to-success-with-the-hand-held-100-400-ii1-4x-iii-combination/comment-page-1/#comment-1725275 Fri, 14 Aug 2015 12:45:48 +0000 http://www.birdsasart-blog.com/?p=28448#comment-1725275 In reply to Chuck Carlson.

I just recently got the batter pack and I see both batteries draining together at about the same rate. However, I don’t believe it gives any extra boost to lenses like what is claimed with a 1D battery.

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