Specifications

● When using the EF500mm f/4L IS USM or the
EF600mm f/4L IS USM with the EF2× II
extender, set the focus mode to MF. With the
EOS-1V/HS, EOS-3, EOS-1Ds Mark II, EOS-
1Ds, EOS-1D Mark II N, EOS-1D Mark II or
EOS-1D cameras, auto-focusing is only effective
for the central focusing point.
● When taking pictures on an EOS 5 using an
EF1.4× II or EF2× II extender with the
EF500mm f/4L IS USM or the EF600mm f/4L IS
USM lens, use the exposure compensation
values shown in the table below.
● Extenders cannot be used more than one at a
time.
ENG-18
Extenders (sold separately)
15. Extension tube (sold separately)
The tables below show the photographic range
and magnification when each lens is used with
an EF12 II or EF25 II extension tube.
Photographic range (mm) Magnification (×)
Close distance Long distance Close distance Long distance
EF300mm f/2.8L IS USM
EF12 II 2016 7561 0.18 0.04
EF25 II 1687 3731 0.24 0.09
EF400mm f/2.8L IS USM
EF12 II 2602 13633 0.19 0.03
EF25 II 2314 6974 0.23 0.06
EF500mm f/4L IS USM
EF12 II 3856 21193 0.15 0.03
EF25 II 3391 10778 0.18 0.05
EF600mm f/4L IS USM
EF12 II 4777 29195 0.14 0.02
EF25 II 4182 13944 0.17 0.05
Autofocusing slows down when the lens is used
with an extender, in order to maintain the precision
of autofocus control.
EF1.4
×
II EF2
×
II
Evaluative metering -0.5 step -1 step
Center-weighted average metering -0.5 step -1 step
Spot metering — -0.5 step