Canon EF300mm F2.8L IS USM Instructions Manual page 13

Tips on Using the Image Stabilizer
Set the image stabilizer switch to
you are taking pictures with a tripod.
* Even if the image stabilizer switch is set to
(on), the IS function does not operate because
the electronic circuits in the lens automatically
detect that a tripod is being used. However,
because electrical power is still being supplied
to the image stabilizer unit, the number of
available shots is roughly 20% fewer than it
would be with the switch set to
The image stabilizer is equally effective for
hand-held photography and photography with a
monopod.
Set the image stabilizer switch to
you are taking pictures using the Bulb setting
(long exposures). If the image stabilizer switch is
set to (on), the image stabilizer function may
introduce errors.
The image stabilizer may not be fully effective in
the following situations:
• Panning with large camera movements in
MODE 1.
• Taking pictures from a moving object such as a
vehicle in MODE 1.
• Taking pictures other than panning shots in
MODE 2.
ENG-12
(off) when
(off).
(off) when
The image stabilizer function operates normally
with EOS cameras launched since the fall of
1993 (EOS REBEL XS/500, EOS-1N/DP/HS/RS,
EOS ELAN IIE/50E, EOS REBEL G/500 N, EOS
5000/888, EOS IX, EOS IX Lite/IX 7 and EOS-3)
when the extender EF2× II is used in
conjunction with the EF500mm f/4L IS USM or
the EF600mm f/4L IS USM, but not with EOS
cameras launched before that time (EOS650,
EOS620, EOS 630/600, EOS RT, EOS 700,
EOS750, EOS850, EOS-1, EOS A2/A2E/5,
EOS10S/10, EOS ELAN/100,
EOS REBEL S/REBEL/1000F/1000,
EOS REBEL SII/REBEL II/1000FN/1000N).
The image stabilizer function will not operate in
self-timer photography with the EOS-1V/HS,
EOS-3, EOS ELAN 7E/7/EOS 30/33,
EOS ELAN7NE/ELAN7N/EOS30V/33V,
EOS ELAN IIE/50E, EOS REBEL 2000/300,
EOS IX and EOS D30.
The image stabilizer operates for about two
seconds even when your finger is off the shutter
button. Do not remove the lens while the
stabilizer is in operation. This will cause a
malfunction.