I found myself a bit too close to this bird when it started scratching so I made a single image of the rear of the bird after creating several of the front end.
This stitched pano of a scratching Royal Tern was created from two images made on last Monday’s In-the-Field Workshop at Fort DeSoto with the tripod-mounted Canon EF 600mm f/4L IS II USM lens, the Canon 2x EF Extender III (Teleconverter), and the Canon EOS-1D X Digital SLR camera. ISO 400: 1/1600 sec. at f/8 in Manual Mode confirmed via histogram check.
Central sensor (by necessity) Expand/AI Servo/Rear Focus AF on the base of the bill where it meets the head and recompose. Click here if you missed the Rear Focus Tutorial.
You cannot beat the 600II/2XIII TC combo for reach (with phase detection AF).
See this image larger in the blog post comparing the Canon 500II and the Canon 600II here.
As for the photo, don't be shy; all comments welcome.







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, and you pretty much nailed the overall exposure.

