Last week I rented the Canon 2x extender from the folks at Lumoid with the goal to capture some Bald Eagles on the Skagit River in WA state.  I combined the 2x extender with my 70-200 f/2.8 to create a 140-400 f/5.6 lens(more about the switch to f5/.6 in a moment).  The eagles were few and far but I still had fun using the lens. Watch the video and review the chart below for compatible lenses.

Lenses Compatible with Canon 2x III Extender -Notice that when using this extender your maximum aperture is halved.  A f/2.8 becomes f/5.6.

EF 2x Compatibility Chart


EF 135mm f/2L USM 270 4 ~ 64 0.38 O
EF 180mm f/3.5L Macro USM 360 6.7*1 ~ 64 2.0 X
EF 200mm f/1.8L USM 400 3.5 ~ 45 0.18 O
EF 200mm f/2L IS USM 400 5.6 ~ 64 0.24 O*4
EF 200mm f/2.8L II USM 400 5.6 ~ 64 0.32 O
EF 300mm f/2.8L IS USM 600 5.6 ~ 64 0.28 O
EF 300mm f/4L IS USM 600 8 ~ 64 0.47 X*4*5
EF 400mm f/2.8L IS USM 800 5.6 ~ 64 0.31 O
EF 400mm f/4L DO IS USM 800 8 ~ 64 0.24 X*4*5
EF 400mm f/5.6L USM 800 11 ~ 64 0.18 X
EF 500mm f/4L IS USM 1,000 8 ~ 90 0.25 X*4*5
EF 600mm f/4L IS USM 1,200 8 ~ 90 0.24 X*4*5
EF 800mm f/5.6L IS USM 1,600 11 ~ 64 0.28 X
EF 1200mm f/5.6L USM 2,400 11 ~ 64 0.18 X
EF 70-200mm f/2.8L USM 140 ~ 400 5.6 ~ 64 0.33 O*2
EF 70-200mm f/2.8L IS USM 140 ~ 400 5.6 ~ 64 0.33 O*2
EF 70-200mm f/2.8L IS II USM 140 ~ 400 5.6 ~ 64 0.33 O*2
EF 70-200mm f/4L USM 140 ~ 400 8 ~ 64 0.45 X*4
EF 70-200mm f/4L IS USM 140 ~ 400 8 ~ 64 0.45 X*4
EF 100-400mm f/4.5-5.6L IS USM 200 ~ 800 9.5 ~ 64 0.41 X*5
(O =possible X =impossible)
*1 Data
based on EOS models with exposures displayed in 1/2 stop increments.
It varies slightly with the EOS-1v, EOS-1N, EOS-1 and EOS-3.
*2 If
the EF 70-200mm f/2.8L USM lens is attached to an EOS camera having
multiple focusing points and an Extender is attached to the lens,
only the center focusing point will be usable for AF.
*3 The
autofocusing range is from 0.8m/2.6ft. to infinity.
*4 With the EOS-1D series, EOS-1v and EOS-3, AF is possible, but with the center focusing point only.
*5 The
Image Stabilizer does not operate with the following cameras: EOS
650, 620, 630/600, RT, 700, 750, 850, EOS-1, A2/A2E, 10s, Elan, Rebel/Rebel
S, Rebel II/Rebel SII.

Verdict – If you have one of the lenses the 2x extender is compatible with and you occasionally need more zoom it is a VERY cost effective way to get there and you can do it with a smaller lens.  Consider renting if you only need occasionally.     Buy if you want to double your zoom often without carrying around a much larger lens.  Buy from Amazon

Canon 2x Extender Manual

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