Thank you for purchasing a Canon product.
Canon’s EF300mm f/2.8L IS USM, EF400mm f/2.8L IS USM, EF500mm f/4L IS USM and EF600mm f/4L IS USM are
●“IS” stands for Image Stabilizer.
●“USM” stands for Ultrasonic Motor.
Handling Cautions
●If the lens is taken from a cold environment into a warm one, condensation may develop on the lens surface and internal parts. To prevent condensation in this case, first put the lens into an airtight plastic bag before taking it from a cold to warm environment. Then take out the lens after it has warmed gradually. Do the same when taking the lens from a warm environment into a cold one.
Do not stand on top of the lens case. You may fall and injure yourself.
Do not pile lens cases on top of one another as they may fall and cause injury.
●Do not leave the lens in excessive heat such as in a car in direct sunlight. High temperatures can cause the lens to malfunction.
Features
1.The Image Stabilizer gives the equivalent effect of a shutter speed two stops* faster.
2.Use of fluorite and UD lens elements giving superior definition.
3.Ultrasonic motor (USM) for fast, quiet autofocus.
4.Manual focusing is available after the subject comes into focus in autofocus mode (ONE SHOT AF).
5.An AF stop button to pause autofocus whenever desired.
6.Can be used with EF1.4⋅ II/EF2⋅ II extenders.
7.A focus preset function for advance storage of focusing positions in memory to allow instantaneous focusing.
8.Tight seal structure ensures excellent dustproof and
9.Designed for lighter weight with parts made of magnesium alloy.
*Based on [1/focal length] second.
Generally, it requires a shutter speed [1/focal length] second or faster to prevent camera shake.