Canon EF 300mm f/4L IS USM Instruction page 13

10. Filters
(Sold separately)
The lens accepts up to two
screw-on filters.
When a polarizing filter is
required, use Canon's PL-C
77mm II polarizing filter.
• The polarizing filter cannot be
used together with a normal
filter.
• A polarizing filter attached to
the lens cannot be turned
while the built-in hood is
extended.
ENG-12
11. Extenders (Sold separately)
The lens can be used with Extender EF 1.4× ll and 2× ll. The lens
specifications when an Extender is attached are shown below.
Focal Length
Diagonal Extent
Angle of View Vertical Extent
Horizontal Extent
Max. Magnification
Focus Mode
Aperture Range
* When an Extender EF 1.4× ll is attached, the AF speed
becomes slower to maintain adequate AF control.
• With Extender 2× ll attached to the lens, only manual focus will be
possible. The only exceptions are with the EOS-1V/HS, 3, 1Ds Mark
II, 1Ds, 1D Mark II N, 1D Mark II, and 1D which can still autofocus,
but only with the center focusing point.
With EF 1.4× ll With EF 2× ll
420mm
6°10'
3°20'
5°
0.33×
AF enabled* Manual focus
f/5.6-f/45
600mm
4°10'
2°20'
3°30'
0.47×
f/8-f/64