Comments on: “Impossible?:” The Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens https://www.birdsasart-blog.com/baa/2011/02/12/impossible-the-canon-ef-200-400mm-f4l-is-usm-extender-1-4x-lens/ The blog of bird photographer Arthur Morris Tue, 20 Nov 2012 03:26:54 +0000 hourly 1 https://wordpress.org/?v=6.8.3 By: Chris https://www.birdsasart-blog.com/baa/2011/02/12/impossible-the-canon-ef-200-400mm-f4l-is-usm-extender-1-4x-lens/comment-page-1/#comment-333664 Tue, 20 Nov 2012 03:26:54 +0000 http://www.birdsasart-blog.com/?p=3887#comment-333664 In reply to bill butchet.

The 100-400mm was a ground breaking lens. Its my most used lens thanks to it size and flexibility. But its still 1990’s techcnology. Where is the mark II?

PS: Yes, I am jealous of the guys with the black 200-400mm F/4.

]]> By: bill butchet https://www.birdsasart-blog.com/baa/2011/02/12/impossible-the-canon-ef-200-400mm-f4l-is-usm-extender-1-4x-lens/comment-page-1/#comment-331140 Sat, 17 Nov 2012 17:35:15 +0000 http://www.birdsasart-blog.com/?p=3887#comment-331140 I finally broke down and bought 100-400, its a love hate relationship. Focus is slow when tracking birds in flight. Is sharp in good light, though lacks the pop of my 300 4.0. Is convient though. I think if you need more reach and focus speed a 400 5.6 maybe better. Cant wait for canon to come up with a 500 5.6, or a 500 6.3 or even a 200-500 that is less than $3000 dollars would be awesome for us ameutures. And or make a prosumer body that will autofocus a 5.6 lens with an extender.

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