Extra reach aside, how is he planning on manually focusing and tracking something as fast as a fighter jet?...
Do you mean FOV? 400mm on a full frame is still 400mm on a crop camera.
"your nose is too big"
Joined Jun 2006
Location: Maidenhead, UK
OK folks, thanks for all the input. I'll advise the customer that an Extender probably won't be very useful, and the 100-400 will be fine for his needs.
www.LensesForHire.co.uk - complete with matching POTN discussion thread
Joined Mar 2006
Location: San Jose,CA
Actually even though it does take the TC's Canon reps at ISAP and other venues said that the lens was never really meant to use them. The glass for most shows is perfect. Stopped down it sharp and can get you to most of the high angle turn shots and still use 2/3rds of the sensor.