Hi Michael, Thanks for your update. I am heading to the elephant seals at Ano Nuevo this week myself (if I can kick this cold), but will be bringing my 100-400 4.5 L IS with me. I am saving up for the 200-400 ...someday. Did you use a tripod while sh...
I was in southeastern Alaska recently as well and rented the Canon EF 200-400mm f/4L IS USM Extender 1.4X lens for some wildlife shooting. I was not disappointed in the least, I came home with many fantastic shots of grizzlies (what I had gone up to ...