Canon Extender EF 1.4x III
The Canon Extender EF 1.4x III is a teleconverter for the Canon EF autofocus mount, multiplying the focal length of compatible EF telephoto and super-telephoto lenses by 1.4x at the cost of one stop of light. It is the third-generation version of Canon's 1.4x EF extender, designed to pair with white-series L telephotos and maintain autofocus and electronic communication with the host body.
At recent UK auction, hammer prices for the Extender EF 1.4x III have sat in a tight £125–£138 band, with a median around £132 across the limited sample available in 2026. These are wholesale saleroom results rather than dealer retail, so what a clean copy sells for at auction today typically lands below what the same unit is worth on the used dealer shelf; condition of the rear protruding element and contact pins is the main swing factor on value and price.
Sales History
Prices shown are realised prices — auction results and completed eBay sales, never asking prices. Most saleroom figures are hammer prices, before commission; some houses publish a premium-inclusive figure, and we do not adjust for condition. Dealer and retail asking prices are typically higher. How this figure is calculated.
Prices updated: August 2026
| Date | Price | Value GBP | Source | |
|---|---|---|---|---|
| Aug 2026 | £188 | £188 | 🇬🇧 eBay | |
Title: Canon Extender EF 1.4x III Teleconverter for Canon EF Lens, Box & Manuals
Description:
Canon 1.4 extender mk iii. Excellent condition with original box excluding lens pouch. FREE POSTAGE via RMSD Location: Darwen, United Kingdom |
||||
|
Loading...
|
||||
| Aug 2026 | £181 | £181 | 🇬🇧 eBay | |
Title: Canon Extender EF 1.4x III Canon EF Mount 1.4x Teleconverter with Pouch
Description:
Canon Extender EF 1.4x III Canon EF Mount 1.4x Teleconverter with Pouch Location: St. Neots, United Kingdom |
||||
|
Loading...
|
||||
| Jul 2026 | £208 | £208 | 🇬🇧 eBay | |
Title: Canon Extender EF 1.4x III Teleconverter
Description:
Appearance:There are few scratches or signs of use on the exterior, making it one of the best used models of the same model. / Optic:The lens condition has been checked under strong light, and there is no fungus, haze, scratches, or separation; it is in excellent condition. / Function:We have inspected each part and found no problems with the basic operation. Location: Toyama, Japan |
||||
|
Loading...
|
||||
| Jul 2026 | £85 | £85 | 🇬🇧 eBay | |
Title: CANON EXTENDER EF 1.4x III CONVERTER LENS - DAMAGED / FAULTY / SPARES / REPAIR
Description:
Extender lens with rear cap only. Original box and polystyrene insert. Nothing else is included in the sale. There are two mount screws missing. I can see a ribbon cable through one of the screw holes (image 11). Location: Kent, United Kingdom |
||||
|
Loading...
|
||||
| Jul 2026 | £188 | £188 | 🇬🇧 eBay | |
Title: Canon Extender EF 1.4x III Teleconverter For EF Mount From JAPAN
Description:
The Canon Extender EF 1.4x III Teleconverter is a high-quality accessory designed for Canon EF mount lenses. Made with durable plastic materials and a sleek design, this teleconverter increases the focal length by 1.4x for a fixed prime lens, allowing for versatile shooting capabilities. With auto focus functionality and compatibility with Canon EF series lenses, this teleconverter is a reliable choice for photographers looking to expand their creative options. Made in Japan by the renowned brand Canon, this teleconverter is a top-notch product for any photography enthusiast. Location: Mieken, default, Japan |
||||
|
Loading...
|
||||
| Jan 2026 | £150 | £120 | 🇬🇧 Flints Auctions | |
|
Auction: Cameras & Scientific Instruments (Lot 207) Title: A Canon Extender EF 1.4x III Lens Adapter
Description:
white, serial no. 5290000875, body, E, elements, E, complete with maker's box Note: This lot has a slight odour that is noticeable |
||||
|
Loading...
|
||||
| Jan 2026 | £150 | £120 | 🇬🇧 Flints Auctions | |
|
Auction: Cameras & Scientific Instruments (Lot 206) Title: A Canon Extender EF 1.4x III Lens Adapter
Description:
white, serial no. 1880000485, body, E, elements, E, complete with maker's box Note: This lot has a slight odour that is noticeable |
||||
|
Loading...
|
||||
| Jan 2026 | £138 | £110 | 🇬🇧 Flints Auctions | |
|
Auction: Cameras & Scientific Instruments (Lot 208) Title: A Canon Extender EF 1.4x III Lens Adapter
Description:
white, serial no. 5290000870, body, E, elements, E, complete with maker's box Note: This lot has a slight odour that is noticeable |
||||
|
Loading...
|
||||
| Jan 2026 | £125 | £100 | 🇬🇧 Flints Auctions | |
|
Auction: Cameras & Scientific Instruments (Lot 205) Title: A Canon Extender EF 1.4x III Lens Adapter
Description:
white, serial no 0860000038, body, E, elements, E, complete with maker's box Note: This lot has a slight odour that is noticeable |
||||
|
Loading...
|
||||
| Apr 2024 | £130 | £130 | 🇬🇧 Special Auction Services | |
|
Auction: Photographica & Cameras Auction (Lot 416) Title: A Canon Extender EF 1.4x III
Description:
A Canon Extender EF 1.4x III, working, barrel G-VG, elements G-VG, with caps in Canon LP811 lens bag |
||||
|
Loading...
|
||||
Frequently asked questions
How much does a Canon Extender EF 1.4x III sell for at UK auction?
Recent UK hammer results for the Extender EF 1.4x III sit between £125 and £138, giving a working median around £132 based on the small 2026 sample.
What is a Canon Extender EF 1.4x III worth today?
Based on the auction data available, a complete and clean example is worth roughly £125–£138 at saleroom level in 2026, with retail dealer pricing typically higher.
Does the Extender EF 1.4x III work with all Canon EF lenses?
No — it is designed for compatible Canon EF telephoto and super-telephoto lenses, primarily white-series L primes and zooms; it will not mount on lenses with rear elements that intrude into the converter's protruding front group.