TeleConverters & Extension Tubes
A teleconverter (sometimes called tele extender) is a secondary lens mounted between a camera and a photographic lens which enlarges the central part of an image obtained by the objective lens. A 2× teleconverter for a 35 mm camera would enlarge the central 12×18 mm part of an image to the size of 24×36 mm in the standard 35 mm film format.
Teleconverters are typically made in 1.4×, 1.7×, 2× and 3× variants, with 1.4× and 2× being the most common. A 2× teleconverter effectively doubles the focal length of a given lens. Teleconverters also decrease the intensity of the light that reaches the film plane (or sensor) by a factor of 4—equivalent to doubling the focal ratio—and decrease the resolution of an image by a factor of 2.
An extension tube - also called extension ring - is used with interchangeable lenses to focus closer, useful in macro photography.
The tube contains no optical elements; its sole purpose is to move the lens farther from the image plane. The farther away the lens is, the closer the focus, the greater the magnification, and also the greater the loss of light (requiring a longer exposure time). Lenses classically focus closer than infinity by moving all optical elements farther from the film or sensor; an extension tube simply enables this movement.
Because extension tubes do not have optics, they don't affect the optical quality of a lens. Because of their function, there are other effects: decrease of light; shallower depth of field; and loss of ability to focus at infinity. The longer the extension tube, the closer the lens can focus. The amount of light and depth of field will be equally reduced. On modern cameras using auto exposure this is all corrected for by the camera, but when not using auto exposure this has to be calculated and taken into account when setting exposure.
The precise reduction of the amount of light reaching the imaging plane can be calculated using the inverse square law formula.
Shop with confidence with these fantastic lens add-ons from Canon, Fujifilm, Kenko, Nikon, Panasonic, Sigma, Sony and Tamron
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Canon EF12 II & EF25 II Macro Extension Tube twin Set
- New Or Secondhand: New
- Lens is suitable for: Canon EOS APS-C (EF-S) & Full Frame (EF)
- Fitting: Canon EF/EFs
- Converter / Adapter
- Macro
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Canon EF12 II Extension Tube
(131)- New Or Secondhand: New
- Lens is suitable for: Canon EOS APS-C (EF-S) & Full Frame (EF)
- Fitting: Canon EF/EFs
- Converter / Adapter
- Macro
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Canon EF25 II Extension Tube
(173)- New Or Secondhand: New
- Lens is suitable for: Canon EOS APS-C (EF-S) & Full Frame (EF)
- Fitting: Canon EF/EFs
- Converter / Adapter
- Macro
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Canon Extender EF 1.4x III
(398)- New Or Secondhand: New
- Lens is suitable for: Canon EOS Full Frame (EF) Only
- Fitting: Canon EF Only
- Lens Type: Converter / Adapter
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Canon Extender EF 2x III
(389)- New Or Secondhand: New
- Lens is suitable for: Canon EOS Full Frame (EF) Only
- Fitting: Canon EF Only
- Lens Type: Converter / Adapter
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Fujifilm 2x WR TeleConverter XF
(1)- New Or Secondhand: New
- Lens is suitable for: Fujifilm X-Series Body
- Fitting: Fujifilm X
- Lens Type: Converter / Adapter
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Fujifilm MCEX-11 Macro Lens Extension Tube
(1)- New Or Secondhand: New
- Fitting: Fujifilm X
- Converter / Adapter
- Macro
- Filter Size: Not Applicable
£74.00
RRP £84 SAVE £10.00
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Fujifilm MCEX-16 Macro Lens Extension Tube
(2)- New Or Secondhand: New
- Fitting: Fujifilm X
- Lens Type: Macro
- Filter Size: Not Applicable
£74.00
RRP £84 SAVE £10.00
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Kenko DG Extension Tube Set (Sony FE Mount)
- New Or Secondhand: New
- Lens is suitable for: Sony Full Frame E-Mount
- Fitting: Sony E-Mount (APS-C & Full Frame)
- Converter / Adapter
- Macro
Special Price
£99.00
RRP £149.99 SAVE £50.99
Save £21.00! Previously £120.00
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Kenko DG Extension Tube Set 10mm + 16mm for Canon RF
(1)- New Or Secondhand: New
- Fitting: Canon RF
- Converter / Adapter
- Macro
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Kenko DG Extension Tube Set 10mm + 16mm for Nikon Z
- New Or Secondhand: New
- Fitting: Nikon Z
- Converter / Adapter
- Macro
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Kenko TELEPLUS DG TUBES 36+20+12mm for CANON EOS cameras
(583)- New Or Secondhand: New
- Lens is suitable for: Canon EOS APS-C (EF-S) & Full Frame (EF)
- Fitting: Canon EF/EFs
- Converter / Adapter
- Macro
£120.00
RRP £149.99 SAVE £29.99
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Kenko Teleplus AF Extension Tube Set DG (Nikon FX Fit)
(581)- New Or Secondhand: New
- Fitting: Nikon FX / DX
- Converter / Adapter
- Macro
Special Price
£110.00
RRP £149.99 SAVE £39.99
Save £10.00! Previously £120.00
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Kenko Teleplus AF Extension Tube Set DG (Sony E-Mount Fit)
- New Or Secondhand: New
- Lens is suitable for: Sony Full Frame E-Mount
- Fitting: Sony E-Mount (APS-C & Full Frame)
- Converter / Adapter
- Macro
£130.00
RRP £149.99 SAVE £19.99
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Spend over £150 for FREE delivery
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Kenko Teleplus HD DGX 1.4x TeleConverter (Canon EF/EFs Fit)
(7)- New Or Secondhand: New
- Lens is suitable for: Canon EOS APS-C (EF-S) & Full Frame (EF)
- Fitting: Canon EF/EFs
- Lens Type: Converter / Adapter
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Kenko Teleplus HD DGX 1.4x TeleConverter (Nikon FX Fit)
(7)- New Or Secondhand: New
- Lens is suitable for: Nikon Full Frame (FX)
- Fitting: Nikon FX Only
- Lens Type: Converter / Adapter
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Kenko Teleplus HDpro DGX 1.4x TeleConverter (Canon EF Fit)
- New Or Secondhand: New
- Lens is suitable for: Canon EOS Full Frame (EF) Only
- Fitting: Canon EF Only
- Lens Type: Converter / Adapter
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Kenko Teleplus HDpro DGX 1.4x TeleConverter (Nikon FX Fit)
(24)- New Or Secondhand: New
- Lens is suitable for: Nikon Full Frame (FX)
- Fitting: Nikon FX Only
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Kenko Teleplus HDpro DGX 2x TeleConverter (Canon EF Fit)
- New Or Secondhand: New
- Lens is suitable for: Canon EOS Full Frame (EF) Only
- Fitting: Canon EF Only
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Kenko Teleplus HDpro DGX 2x TeleConverter (Nikon FX Fit)
- New Or Secondhand: New
- Lens is suitable for: Nikon Full Frame (FX)
- Fitting: Nikon FX Only
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Nikon Nikkor Z 1.4x Teleconverter
(60)- New Or Secondhand: New
- Fitting: Nikon Z
- Lens Type: Converter / Adapter
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Nikon Nikkor Z 2x Teleconverter
(1)- New Or Secondhand: New
- Fitting: Nikon Z
- Lens Type: Converter / Adapter
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Nikon TC-14E AF-S Teleconverter III
(173)- New Or Secondhand: New
- Lens is suitable for: Nikon Full Frame (FX)
- Fitting: Nikon FX Only
- Lens Type: Converter / Adapter
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