I wasn't really expecting this to happen when I turned around and saw it. I actually had my 500 on photographing wildlife at the time so I decided to get in close thinking it could really make for a dramatic image. The mountainside was bright orange from the light of sunrise/golden hour beaming against it. When an opportunity presents itself, click away! ---John.
Sigma 170-500mm F5-6.3 APO Aspherical. There's 2 different versions of this lens, one is sorta so-so, gets the job done but don't expect incredible shots and then the copy I have which is better. I am pretty floored by detail it renders and its sharpness.