crazydaddio wrote:
No need to do anything special. Be at ice level and as close to the glass as possible. (Further away and the photo becomes less sharp) Try to shoot with the Glass in the same "plane" as the lens to reduce distortion. (This photo shot with 70-200f2.8 wide open with 6D ...target was near center ice and I was standing behind the glass just left of the crease) . No issues with focus acquisiton even from the normally "poor for sports" AF system of the 6D :-)