hi , i have been renting and using this canon 100-400mm lense on a 7D body for almost 4 months now but most of my shots comes to only 365 or 370mm focal length maximum and i am 100% sure that i shot them all on full focal length which is 400mm..

i was reading somewhere on google that it gives maximum of 380mm focal length, is it true, i am planning to buy 100-400mm soon.

let me know your feedback on this please