Robin on branch- environmental shot- Glacier NP

WE were hiking a bit when we saw the robin quite a ways away and only carrying a 100-400, So, tripod settled in, a 2XII plus the 100-400 at 400, plus the 1.6 multiplier of a 10D, I hoped the shot would work out. I have removed some sharpening artifacts. I considered cropping to make the eye land on the UL power point, but after comparing, I liked the branches and the more environmental shot. A personal choice since the robin location is stornger, but the envoronmental element suffers with a crop. We were on a gully crest and the bird was below. For all the dificulties, I think it came out ok,IMHO.The 100-400 seems to hold decent sharpmess, at least at this file size. 10D, ISO 200, 100-400 IS, 2XII TC, equivalent of 1280mm. no flash, the catchlight is from natural light.