Comments on: Size Does Matter; The Power of the Square of the Focal Length https://www.birdsasart-blog.com/baa/2011/08/25/size-does-matter-the-power-of-the-square-of-the-focal-length/ The blog of bird photographer Arthur Morris Mon, 29 Aug 2011 14:59:00 +0000 hourly 1 https://wordpress.org/?v=6.8 By: Mike Forbes https://www.birdsasart-blog.com/baa/2011/08/25/size-does-matter-the-power-of-the-square-of-the-focal-length/comment-page-1/#comment-93859 Mon, 29 Aug 2011 14:59:00 +0000 http://www.birdsasart-blog.com/?p=6559#comment-93859 I read a comment below saying that you can’t put a 2x TE on a 7D and a 600mm f4 lens? Or that it does’t work well or am I missing something?

You can put it on a 600 f/4 and focus manually or use Live Mode AF to focus in Live View as per the 7D User’s Guide (slow and cumbersome) but you will not have normal AF with that combo as the 7D focuses only to f/5.6. artie

]]> By: Bill G https://www.birdsasart-blog.com/baa/2011/08/25/size-does-matter-the-power-of-the-square-of-the-focal-length/comment-page-1/#comment-93803 Mon, 29 Aug 2011 05:13:00 +0000 http://www.birdsasart-blog.com/?p=6559#comment-93803 Points taken, Artie. Thanks! –bill

YAW. artie

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