Fluidr / Rob & Amy Lavoie's "Canon EF 400mm f/4 DO IS II USM" set

White-Breasted Nuthatch

A Canon EOS-1D X Mark II — 1/320s ƒ/8 ISO 1250 at 800 mm

N 27 B 1.5K C 9 E Feb 15, 2017 F Feb 15, 2017

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Bluejay

A Canon EOS-1D X Mark II — 1/800s ƒ/8 ISO 1600 at 800 mm

N 25 B 1.7K C 4 E Feb 13, 2017 F Feb 13, 2017

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Northern Cardinal

A Canon EOS-1D X Mark II — 1/800s ƒ/9 ISO 1250 at 800 mm

N 21 B 4.1K C 3 E Feb 13, 2017 F Feb 13, 2017

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2x with the 400DO II

Squirrel in the snow

A Canon EOS-1D X Mark II — 1/1250s ƒ/8 ISO 1250 at 800 mm

N 17 B 1.5K C 3 E Feb 13, 2017 F Feb 13, 2017

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Another test in natural light and windy conditions. This 2x on the 400DO II works amazing well. AF is very responsive. View in large for the best detail.

Rylee with Canon EF 400mm f4 DO IS II

A Canon EOS-1D X Mark II — 1/250s ƒ/8 ISO 200 at 800 mm

N 24 B 3.1K C 3 E Feb 12, 2017 F Feb 12, 2017

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Another test shot with the Canon EF 400mm f/4 DO IS II. Still terrible lighting outside, so I used flash.