I have just brought the Canon 100-400mm IS lens, and I since a lot of you in this forum has this lens, I was hoping you could answer some of my questions about using this lens at an airshow.
1) When do you use the IS?
Do you always have it on in Mode 2, or only for takeoffs and landings and turned off during the display routine, or do you keep it turned off at all times?
2) How does the IS affect battery use?
Thanks in advance.