Canon Extender EF

The Canon Extender EF 1.4x II.

Image of the Canon 2x III Extender

The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, they will multiply the focal length of the lens by a factor of either 1.4x or 2x, at the cost of decreasing the lens' aperture by 1 or 2 stops respectively. For example, using a 1.4x or 2x extender with the Canon EF 500mm f/4L IS USM would result in a 700mm f/5.6 or 1000mm f/8 lens.

Canon has released six models:

1.4x
1.4x II^[1]
1.4x III
2x
2x II^[2]
2x III

Technical information

The extenders are constructed with metal bayonets, and engineered plastic ends. There are no moving parts, other than the lens latch lock. Three generations of the extenders exist: the older 1.4× and 2×, the 1.4× II and 2× II, and the 1.4× III and 2.0× III. The II versions have weather-sealing and anti-reflective surfaces inside the extender body. The optical construction of the 1.4× versions are a of five-element design. Both 2× versions use seven elements, although the optical formula of the II version is different to improve optical performance.^[3] The III versions of the extenders have improved autofocus performance as well increased image quality over the II, and their front and rear elements are coated with fluorine anti-smear coating to be easier to clean.^[4]

Compatibility information

The mount of a lens compatible with an Extender EF

300mm f/2.8 IS lens, no extender

300mm f/2.8 IS lens, 1.4× extender

300mm f/2.8 IS lens, 2.0× extender

These Extender EF lenses can only be used with lenses that have a compatible mount. While all EF lenses have mount designs that can be used with EOS bodies, only lenses with accordant mounts can be used with the extender EF lenses. These lenses must have the clearance to accept the protruding lens on the extender, as well as 10 (3 extra) electronic contacts for proper electronic communication with the extender. These extra electronic contacts are used for sending the correct aperture information to the body.

When a compatible lens is used with a 1.4× or 2× extender, it will cost the lens a one or two stop decline in aperture size, respectively. Autofocus speed of any used EF lens is also affected. When used with the 1.4× extender, autofocus speed is reduced by 50%. When used with the 2× extender, autofocus speed is reduced by 75%. Image stabilization may not work on lenses that are equipped with an extender, or on certain EOS bodies.

Though not specified by Canon as such, users have reported that the tilt-shift lenses in Canon's line-up can also be used with the extenders.^[5]^[6]^[7] However, when used with an extender, the lens will not pass on the correct aperture to the camera. The focal length stored in the Exif data will also be incorrect.

List of compatible EF lenses

The following is a list of EF lenses that are compatible with the Extender EF lenses together with their resulting focal lengths, and apertures. Also listed is the autofocus and image stabilization functionality.

Lens	Lens with 1.4×	AF with 1.4×	IS with 1.4×	Lens with 2×	AF with 2×	IS with 2×
135 mm f/2L USM	190 mm f/2.8		—	270 mm f/4		—
180 mm f/3.5L Macro USM	252 mm f/5^{[nb 1]}	^{[nb 2]}	—	360 mm f/7.1^{[nb 1]}		—
200 mm f/1.8L USM	280 mm f/2.5^{[nb 1]}		—	400 mm f/3.5^{[nb 1]}		—
200 mm f/2.0L IS USM	280 mm f/2.8			400 mm f/4
200 mm f/2.8L II USM	280 mm f/4		—	400 mm f/5.6		—
300 mm f/2.8L USM	420 mm f/4		—	600 mm f/5.6		—
300 mm f/2.8L IS USM	420 mm f/4			600 mm f/5.6
300 mm f/4L USM	420 mm f/5.6		—	600 mm f/8	^{[nb 3]}	—
300 mm f/4L IS USM	420 mm f/5.6			600 mm f/8	^{[nb 3]}
400 mm f/2.8L USM	560 mm f/4		—	800 mm f/5.6		—
400 mm f/2.8L II USM	560 mm f/4		—	800 mm f/5.6		—
400 mm f/2.8L IS USM	560 mm f/4			800 mm f/5.6
400 mm f/4 IS DO USM	560 mm f/5.6			800 mm f/8	^{[nb 3]}
400 mm f/4 DO IS II USM	560 mm f/5.6			800 mm f/8	^{[nb 3]}
400 mm f/5.6L USM	560 mm f/8	^{[nb 3]}	—	800 mm f/11		—
500 mm f/4L IS USM	700 mm f/5.6			1000 mm f/8	^{[nb 3]}
500 mm f/4.5L USM	700 mm f/6.3^{[nb 1]}	^{[nb 3]}	—	1000 mm f/9.0^{[nb 1]}		—
600 mm f/4L USM	840 mm f/5.6		—	1200 mm f/8	^{[nb 3]}	—
600 mm f/4L IS USM	840 mm f/5.6			1200 mm f/8	^{[nb 3]}
800 mm f/5.6L IS USM	1120 mm f/8	^{[nb 3]}		1600 mm f/11
1200 mm f/5.6L USM	1680 mm f/8	^{[nb 3]}	—	2400 mm f/11		—
70–200 mm f/2.8L IS USM	98–280 mm f/4			140–400 mm f/5.6
70–200 mm f/2.8L IS II USM	98–280 mm f/4			140–400 mm f/5.6
70–200 mm f/2.8L USM	98–280 mm f/4	^{[nb 3]}	—	140–400 mm f/5.6	^{[nb 3]}	—
70–200 mm f/4L IS USM	98–280 mm f/5.6			140–400 mm f/8	^{[nb 3]}
70–200 mm f/4L USM	98–280 mm f/5.6		—	140–400 mm f/8	^{[nb 3]}	—
100–400 mm f/4.5–5.6L IS USM	140–560 mm f/6.3–8^{[nb 1]}	^{[nb 3]}		200–800 mm f/9–11^{[nb 1]}
100–400 mm f/4.5–5.6L IS II USM	140–560 mm f/6.3–8^{[nb 1]}	^{[nb 3]}		200–800 mm f/9–11^{[nb 1]}
200–400 mm f/4L IS USM (without built-in extender 1.4×)	280–560 mm f/5.6			400–800 mm f/8	^{[nb 3]}
200–400 mm f/4L IS USM (with built-in extender 1.4×)	400–800 mm f/8	^{[nb 3]}		560–1120 mm f/11
TS-E 17 mm f/4L	24 mm f/5.6	^{[nb 4]}	—	34 mm f/8	^{[nb 4]}	—
TS-E 24 mm f/3.5L	35 mm f/5.0^{[nb 1]}	^{[nb 4]}	—	50 mm f/7.1^{[nb 1]}	^{[nb 4]}	—
TS-E 45 mm f/2.8	65 mm f/4.0	^{[nb 4]}	—	90 mm f/5.6	^{[nb 4]}	—
TS-E 90 mm f/2.8	125 mm f/4.0	^{[nb 4]}	—	180 mm f/5.6	^{[nb 4]}	—
Key
Autofocus:	- AF works. - AF works only with EOS bodies that can AF at f/8. - AF does not work.
Image stabilization:	- IS works. - IS works only with supported EOS bodies (generally, bodies introduced since approximately 1995).

List of EOS bodies that can AF at f/8

Canon EOS bodies that have a high density, high precision auto-focus sensor with 45 or more AF points are able to autofocus at maximum apertures of f/8.^[8]

Canon EOS-1D X Mark II
Canon EOS-1D X (with firmware version 1.1.1)^[9]
Canon EOS 5D Mark III (with firmware version 1.2.1)^[10]
Canon EOS 5DS^[11]
Canon EOS 5DS R
Canon EOS 7D Mark II^[12]
Canon EOS 80D
Canon EOS-1D Mark IV
Canon EOS-1Ds Mark III
Canon EOS-1D Mark III
Canon EOS-1Ds Mark II
Canon EOS-1D Mark II
Canon EOS-1D Mark II N
Canon EOS-1Ds
Canon EOS-1D
Canon EOS-1V
Canon EOS 3

References

↑ Canon Inc. "Extender EF 1.4X II". Canon Camera Museum. Retrieved 2008-01-11.
↑ Canon Inc. "Extender EF 2X II". Canon Camera Museum. Retrieved 2008-01-11.
↑ "Technical Hall - Technical report 2001.9". Canon.com. Retrieved 2013-06-22.
↑ "Canon EF 1.4x III Extender Review". The-digital-picture.com. 2011-01-31. Retrieved 2013-06-22.
↑ Bryan Carnathan. "Canon TS-E 24mm f3.5L review". The-Digital-Picture. Retrieved 2008-10-06.
↑ Bryan Carnathan. "Canon TS-E 45mm f2.8 review". The-Digital-Picture. Retrieved 2008-10-06.
↑ Bryan Carnathan. "Canon TS-E 90mm f2.8 review". The-Digital-Picture. Retrieved 2008-10-06.
↑ Canon Inc. "Extenders". Canon Professional Network - Infobank. Retrieved 2010-01-01.
↑ "The EOS-1D X & f/8". Canon UK. October 23, 2012. Retrieved October 23, 2012.
↑ "EOS 5D Mark III firmware update". canon. October 2012. Retrieved 28 January 2013.
↑ "EOS 5DS/EOS 5DS R Bedienungsanleitung" (PDF). Canon de. May 2015. Retrieved 6 September 2015.
↑ Butler, Richard; Sanyal, Rishi (September 2013). "Canon EOS 7D Mark II - Autofocus & Metering". Canon EOS 7D Mark II First Impressions Review. Digital Photography Review. Retrieved September 22, 2014.

EF LENS WORK III DESIGN SPECIFICATIONS & LENS MAPS

Notes

1 2 3 4 5 6 7 8 9 10 11 12 The aperture is for bodies using 1/3-step displays.
↑ Autofocus range is reduced from 0.48 m–infinity to 0.8 m–infinity.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Autofocus is possible using only the center AF point.
1 2 3 4 5 6 7 8 TS-E lenses are not equipped with an autofocus motor.

Canon EF/EF-S/EF-M lenses

EF-S zoom	EF-S 10–18mm EF-S 10–22mm EF-S 15–85mm EF-S 17–55mm EF-S 17–85mm EF-S 18–55mm EF-S 18–135mm EF-S 18–200mm EF-S 55–250mm

Ultra-wide zoom	EF 11–24mm EF 16–35mm EF 17–40mm

Standard zoom	EF 24–70mm EF 24–105mm EF 28–135mm EF 28–300mm

Telephoto zoom	EF 70–200mm EF 70–300mm EF 75–300mm EF 100–400mm EF 200–400mm

Wide-angle prime	EF 14mm EF 20mm EF 24mm EF-S 24mm EF 28mm EF 35mm

Standard prime	EF 40mm EF 50mm

Telephoto prime	EF 85mm EF 100mm EF 135mm EF 200mm

Super telephoto prime	EF 300mm EF 400mm EF 500mm EF 600mm EF 800mm

Distorting lens	EF 8–15mm Fisheye

Tilt-shift	TS-E 17mm TS-E 24mm TS-E 45mm TS-E 90mm

Macro	EF-M 28mm Macro EF 50mm Compact Macro EF-S 60mm Macro MP-E 65mm 1–5x Macro EF 100mm Macro EF 180mm Macro

EF-M zoom	EF-M 11–22mm EF-M 15–45mm EF-M 18–55mm EF-M 18–150mm EF-M 55–200mm

EF-M prime	EF-M 22mm EF-M 28mm Macro

Lens accessories	Extender EF

Discontinued zoom	EF 17–35mm EF 20–35mm EF 22–55mm EF 24–85mm EF 28–70mm EF 28–80mm EF 28–90mm EF 28–105mm EF 28–200mm EF 35–70mm EF 35–80mm EF 35–105mm EF 35-135mm EF 35–350mm EF 38–76mm EF 50–200mm EF 55–200mm EF 70–210mm EF 80–200mm EF 90–300mm EF 100–200mm EF 100–300mm

Discontinued prime	EF 15mm Fisheye EF 135mm with Softfocus EF 1200mm

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