Thanks Les, I have Nikon's 500mm f/4 and it's all black. >>>One interesting factoid is that these lenses also have a variable infinity so that when the temps do get extreme the lens can still focus.<<< >From your explanation, I assume there is no need to allow the big glass to come to equilibrium with outside air temps? Focus changes have been compensated for in the construction? I also use my lens at night after a hot day to photography the moon or city lights. Take care, Gregory david Stempel FIREFRAMEi m a g i n g www.americanphotojournalist.com
