Here are a few BIF shots from this summer with the Canon 7d2 and the Sigma 150-600 C. I think the combo makes a great all around birding lens and is more than capable of capturing fast moving birds. Just some shots of a few different species including my favorite BIF target, the Purple Martin.
Purple Martin 244mm, F8, ISO 800, SS 1/2000, +1
Purple Martin by
Isaac Grant, on Flickr
403mm, F8, ISO 400, SS 1/2500
Willet by
Isaac Grant, on Flickr
Purple Martin 252mm, F8, ISO 640, SS 1/1600, +2/3
Purple Martin by
Isaac Grant, on Flickr
Purple Martin 293mm, F8, ISO 800, SS 1/2000, +1
Purple Martin by
Isaac Grant, on Flickr
Barn Swallow 324mm, F8, ISO 640, SS 1/1250, +2/3
Barn Swallow by
Isaac Grant, on Flickr
Common Tern 150mm, F8, ISO 400, SS 1/2000
Common Tern by
Isaac Grant, on Flickr