Canon Extender EF

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The Canon Extender EF 1.4× II.

The 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 1.4× or 2.0×, at the cost of decreasing the lens' aperture by 1 or 2 stops respectively. For example, using a 1.4× or 2.0× 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:

  • 1.4×
  • 1.4× II[1]
  • 1.4× III
  • 2× II[2]
  • 2× III

Technical information[edit]

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[edit]

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[edit]

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 Yes 270 mm f/4 Yes
180 mm f/3.5L Macro USM 252 mm f/5[nb 1] Yes[nb 2] 360 mm f/7.1[nb 1] No
200 mm f/1.8L USM 280 mm f/2.5[nb 1] Yes 400 mm f/3.5[nb 1] Yes
200 mm f/2.0L IS USM 280 mm f/2.8 Yes Yes 400 mm f/4 Yes Yes
200 mm f/2.8L II USM 280 mm f/4 Yes 400 mm f/5.6 Yes
300 mm f/2.8L USM 420 mm f/4 Yes 600 mm f/5.6 Yes
300 mm f/2.8L IS USM 420 mm f/4 Yes Yes 600 mm f/5.6 Yes Yes
300 mm f/4L USM 420 mm f/5.6 Yes 600 mm f/8 Maybe[nb 3]
300 mm f/4L IS USM 420 mm f/5.6 Yes Yes 600 mm f/8 Maybe[nb 3] Maybe
400 mm f/2.8L USM 560 mm f/4 Yes 800 mm f/5.6 Yes
400 mm f/2.8L II USM 560 mm f/4 Yes 800 mm f/5.6 Yes
400 mm f/2.8L IS USM 560 mm f/4 Yes Yes 800 mm f/5.6 Yes Yes
400 mm f/4 IS DO USM 560 mm f/5.6 Yes Yes 800 mm f/8 Maybe[nb 3] Maybe
400 mm f/5.6L USM 560 mm f/8 Maybe[nb 3] 800 mm f/11 No
500 mm f/4L IS USM 700 mm f/5.6 Yes Yes 1000 mm f/8 Maybe[nb 3] Maybe
500 mm f/4.5L USM 700 mm f/6.3[nb 1] Maybe[nb 3] 1000 mm f/9.0[nb 1] No
600 mm f/4L USM 840 mm f/5.6 Yes 1200 mm f/8 Maybe[nb 3]
600 mm f/4L IS USM 840 mm f/5.6 Yes Yes 1200 mm f/8 Maybe[nb 3] Maybe
800 mm f/5.6L IS USM 1120 mm f/8 Maybe[nb 3] Maybe 1600 mm f/11 No Maybe
1200 mm f/5.6L USM 1680 mm f/8 Maybe[nb 3] 2400 mm f/11 No
70–200 mm f/2.8L IS USM 98–280 mm f/4 Yes Yes 140–400 mm f/5.6 Yes Yes
70–200 mm f/2.8L IS II USM 98–280 mm f/4 Yes Yes 140–400 mm f/5.6 Yes Yes
70–200 mm f/2.8L USM 98–280 mm f/4 Yes [nb 3] 140–400 mm f/5.6 Yes [nb 3]
70–200 mm f/4L IS USM 98–280 mm f/5.6 Yes Yes 140–400 mm f/8 Maybe[nb 3] Maybe
70–200 mm f/4L USM 98–280 mm f/5.6 Yes 140–400 mm f/8 Maybe[nb 3]
100–400 mm f/4.5–5.6L IS USM 140–560 mm f/6.3–8[nb 1] Maybe[nb 3] Maybe 200–800 mm f/9–11[nb 1] No Maybe
200–400 mm f/4L IS USM

(without built-in extender 1.4×)

280–560 mm f/5.6 Yes Needs update 400–800 mm f/8 Maybe[nb 3] Needs update
200–400 mm f/4L IS USM

(with built-in extender 1.4×)

400–800 mm f/8 Maybe[nb 3] Needs update 560–1120 mm f/11 No Needs update
TS-E 17 mm f/4L 24 mm f/5.6 No[nb 4] 34 mm f/8 No[nb 4]
TS-E 24 mm f/3.5L 35 mm f/5.0[nb 1] No[nb 4] 50 mm f/7.1[nb 1] No[nb 4]
TS-E 45 mm f/2.8 65 mm f/4.0 No[nb 4] 90 mm f/5.6 No[nb 4]
TS-E 90 mm f/2.8 125 mm f/4.0 No[nb 4] 180 mm f/5.6 No[nb 4]
Key
Autofocus: Yes - AF works. Maybe - AF works only with EOS bodies that can AF at f/8. No - AF does not work.
Image stabilization: Yes - IS works. Maybe - IS works only with supported EOS bodies (generally, bodies introduced since approximately 1995).

Notes[edit]

  1. ^ a b c d e f g h i j The aperture is for bodies using 1/3-step displays.
  2. ^ Autofocus range is reduced from 0.48 m–infinity to 0.8 m–infinity.
  3. ^ a b c d e f g h i j k l m n o p q Autofocus is possible using only the center AF point.
  4. ^ a b c d e f g h TS-E lenses are not equipped with an autofocus motor.

List of EOS bodies that can AF at f/8[edit]

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.[12]

See also[edit]

References[edit]

  1. ^ Canon Inc.. "Extender EF 1.4X II". Canon Camera Museum. Retrieved 2008-01-11. 
  2. ^ Canon Inc.. "Extender EF 2X II". Canon Camera Museum. Retrieved 2008-01-11. 
  3. ^ "Technical Hall - Technical report 2001.9". Canon.com. Retrieved 2013-06-22. 
  4. ^ "Canon EF 1.4x III Extender Review". The-digital-picture.com. 2011-01-31. Retrieved 2013-06-22. 
  5. ^ Bryan Carnathan. "Canon TS-E 24mm f3.5L review". The-Digital-Picture. Retrieved 2008-10-06. 
  6. ^ Bryan Carnathan. "Canon TS-E 45mm f2.8 review". The-Digital-Picture. Retrieved 2008-10-06. 
  7. ^ Bryan Carnathan. "Canon TS-E 90mm f2.8 review". The-Digital-Picture. Retrieved 2008-10-06. 
  8. ^ Canon Inc.. "Extenders". Canon Professional Network - Infobank. Retrieved 2010-01-01. 
  9. ^ "The EOS-1D X & f/8". Canon UK. October 23, 2012. Retrieved October 23, 2012. 
  10. ^ "EOS 5D Mark III firmware update". canon. October 2012. Retrieved 28 January 2013.