Canon EF 200-400mm f/4L IS USM Extender 1.4x

Announced May 14, 2013 •
Telephoto zoom lens | Canon EF | 5176B002
Canon EF 200-400mm f/4L IS USM Extender 1.4x Ask a question in forums about the Canon EF 200-400mm f/4L IS USM Extender 1.4x.
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As I am planning a safari later this year and was wondering whether anyone had actual experience with the autofocus of the Canon 200-400/F4 with the Metabones adapter on the A7rii or the A9?  Many thanks.
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Hi Guys I recently purchased a 200-400 2nd hand and was toying with the idea of getting a 7D mark ii as a trial to see if I achieved better results with crop camera and no extender as opposed to full frame 1Dx with extender. Also extra reach of 1.6 would be handy. 560mm FOV. v 640mm FOV. I would struggled on low light days I am sure with regard to noise. Shooting AFL Football mainly. the 7Dii looks so bad...
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One gives compositional benefits, other gives more light and superb sharpness. Deciding which one, is a tough question. Can someone please suggest ? Usage is mostly mammals, early and late evening and in very dusty conditions. Does the 200-400 zoom sucks dust? How is the in built teleconverter, useful ? Not sure if I want to use the in built one and make it a slow F5.6. Thanks. --Tiger Photography
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Using an extender (tele converter) has the advantage that the absolute aperture (in mm, not as f/ number) remains the same with the same lens which allows a relative bright f/nubmer without T/C and yet acceptable with T/C. E.g the bright 200mm f/2.8L with T/C results in a yet acceptable 400 f/5.6. A zoom alternative (100-400 f/4.5-5.6L) results in a dim f/5 at 200mm. Why not make a 200-400 f/2.8-f/5.6 which replaces a T/C and a prime lens ? There is a 200-400 lens f/4L, but that is not a...
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Hi guys, I'd be very interested in sample images and your thoughts on using the 52WII circular polarizer on the 300 / 400 f/2.8 II or the 500 / 600 f/2.0 II (thoughts on the type (I) teles are also welcome. I own the 300 f/2.8 L IS USM II and think of spending the 200 bucks for the filter (sorry only the above mentioned lenses are of interest to me) I have following questions: 1) How much is the image quality affected? 2.) How much light do you loose - is it in the range of 1-2 stops? 3.)...
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