Bumping this So, Andrew, what did you do and what do you think? I read your usage pattern with interest, because I am looking for something probably 400-600, and started researching the 500 f/4 manual for my d810. I figure, God willing and the creek don't rise, the solar eclipse of 2014 may be my last and wanted to shoot it. Currently I have been using a 500 mirror lens, Bausch and Lomb (but one of the "good" ones, that was was a freebie from an friend). I will say, the clock drive works well. The 200-500 Nikkor has turned my head and for the premium for it vs the 500/4 I thought it could be money well spent, unless it is "extremely soft" at 500, where I'd shoot the eclipse. Soooo, how does this story end?