--- product_id: 2453784 title: "Canon EF 2X II Extender Telephoto Accessory" brand: "canon" price: "฿42779" currency: THB in_stock: true reviews_count: 13 category: "Canon" url: https://www.desertcart.co.th/products/2453784-canon-ef-2x-ii-extender-telephoto-accessory store_origin: TH region: Thailand --- # Maintains autofocus f/2.8+ 2x focal length boost Weather-resistant build Canon EF 2X II Extender Telephoto Accessory **Brand:** canon **Price:** ฿42779 **Availability:** ✅ In Stock ## Summary > 📸 Double your lens, double your impact. ## Quick Answers - **What is this?** Canon EF 2X II Extender Telephoto Accessory by canon - **How much does it cost?** ฿42779 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/2453784-canon-ef-2x-ii-extender-telephoto-accessory) ## Best For - canon enthusiasts ## Why This Product - Trusted canon brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Double Your Reach:** Transforms your Canon EF lens focal length by 2x for epic close-ups and distant shots. - • **Compact Powerhouse:** Lightweight (9.3 oz) and pocket-friendly (2.8" x 2.3") for effortless carry and quick setup. - • **Game-Day Essential:** Perfect for capturing intense sports action or wildlife from afar with crystal-clear precision. - • **Speedy Focus, Always:** Keeps autofocus sharp and fast on any EOS body with f/2.8 or faster aperture—never miss the moment. - • **Built to Brave the Elements:** Weather-resistant and anti-reflective internal design ensures reliability in any shooting condition. ## Overview The Canon Extender EF 2X II is a compact, lightweight telephoto extender that doubles the focal length of compatible Canon EF lenses while maintaining autofocus performance on EOS bodies with f/2.8 or faster apertures. Its weather-resistant and anti-reflective design ensures durability and clarity, making it ideal for sports, wildlife, and distant close-up photography. ## Description desertcart.com Designed to double the focal length of any compatible Canon EF lens, the Canon EF 2x II extender telephoto accessory is ideal for sporting events and nature photography. The lens boasts a new seven-element design, along with the same weather-resistant and anti-reflective internal construction as the companion EF 1.4x II extender. More significantly, the extender supports autofocus with any EOS body provided the lens has an f/2.8 or faster maximum aperture (the EF 2x II reduces effective aperture by two stops). The EF 2x II--which also maintains an EOS camera's Image Stabilization technology--carries a one-year warranty. Magnification: 2.0x Lens construction: 7 elements in 5 groups Dimensions: 2.8 inches in diameter and 2.3 inches long Weight: 9.3 ounces Product description Designed to extend a lenses focal length by a factor of 2x, the redesigned Canon EF 2.0X III Teleconverter delivers optical performance on par with the finest Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens and extender, features careful lens placement and coatings to minimize ghosting, flare and chromatic aberration, and even has a new Fluorine coating that keeps soiling, smears, fingerprints to a minimum. Extender EF 2X III meets necessary standards in terms of rugged, dustproof and water-resistant construction, and should be in every professional's camera bag. Review: Quality way to double your focal length - The Canon EF 2X II telephoto extender is a reasonably inexpensive way to double the focal length of some of the Canon lenses. There are a few pro's and con's when considering going this route. The image quality of this extender is extremely good and maintains the image quality of the lens that is attached to. I found it to be far better than other lessor cost extenders. There are a couple of caveats to be aware of before purchasing this extender. First, it is NOT compatible with ALL Canon lenses. Check the Canon site for the specs on this extender and the list of compatible lenses. It is mainly a physical problem of the front element of the extender lens sticking out too far to physically connect with some lenses because their rear element is too far back and it clashes (or crashes) with the extender. Secondly, be aware that a 2x extender will cause a 4x light loss through the optical system (i.e. 2 f-stops slower). This is true of any extender - it's the law of optical physics. Unless your main lens is better than F5.6, the camera will not have enough light to autofocus, so be prepared to manually focus your camera when using a 2x extender. That being said and all of these conditions being understood, the Canon EF 2X II extender is a great way to double the power of your telephoto lens. Review: Works Perfect with 2.8 70-200 - Because of the mixed reviews about this extender "Canon EF Ex II" I had to buy it to see for myself. I used my canon 70-200 MK II 2.8 on my 5D Mk II and I have to admit I hate the softness and especially the soft edges not to mention the slow focus. It doesn't come close to the performance we all know and love with this fine quality lens. I decided to pack it up and ship it back to the seller I was so disappointed. I'm sure many will think I did something wrong or expected to much, this isn't the case since many others have testified to the same results. If you're happy that's great, I wasn't. I decided to at least try it on my Canon 40D which has a 1.6 crop factor which extends the focal length to 640mm and Viola... the quality is absolutely stellar!!! Not only are the images sharp as a tack with images like the 70-200 without extender, and it focuses extremely fast. Needless to say I'm extremely happy and 40D's aren't very expensive, so if you are unhappy with the 2x II and you can afford a 40D that might be an option considering you get a second camera, longer focal length, fabulous images, for less than $400 on average. Just consider the the extra cost like buying two extenders. Why the four stars? I feel it should work on my 5D MK II with equal results, and it doesn't! Regards, Urban Picasso ## Features - Measures 2.8 inches in diameter and 2.3 inches long; weighs 9.3 ounces - Maintains autofocus with any EOD body with f/2.8 or faster aperture - Ideal for shooting close-ups from a distance at sporting events - Telephoto extender designed to double Canon EF lens focal length - Weather-resistant and anti-reflective internal construction ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00009XVBY | | Best Sellers Rank | #1,180 in SLR Camera Lenses | | Brand | Canon | | Built-In Media | Lens Caps, Pouch | | Camera Lens | 7 | | Camera Lens Description | 7 | | Color | White | | Compatible Camera Mount | Canon EF | | Compatible Mountings | Canon EF | | Customer Reviews | 3.8 out of 5 stars 177 Reviews | | Focal Length Description | Attribute not Applicable | | Focus Type | Auto Focus | | Global Trade Identification Number | 00013803001808 | | Image stabilization | Optical | | Item Part Number | 6846A003 | | Item Weight | 9.28 ounces | | Lens | Telephoto | | Lens Coating Description | Fluorine Coating | | Lens Design | Zoom | | Lens Mount | Canon EF | | Lens Type | Telephoto | | Manufacturer | Canon Cameras US | | Manufacturer Part Number | 6864A004 | | Maximum Aperture | 2.8 f | | Maximum Focal Length | 300 Millimeters | | Minimum Aperture | 2.8 | | Minimum Focal Length | 1 Millimeters | | Model Name | ef,extender ef | | Model Number | 6846A003 | | UPC | 013803001808 | | Unit Count | 1.0 Count | | Water Resistance Level | Water Resistant | | Zoom Ratio | 2:1 | ## Product Details - **Brand:** Canon - **Focal Length Description:** Attribute not Applicable - **Lens Type:** Telephoto - **Compatible Mountings:** Canon EF - **Camera Lens Description:** 7 ## Images ![Canon EF 2X II Extender Telephoto Accessory - Image 1](https://m.media-amazon.com/images/I/61oDAwgiaDL.jpg) ![Canon EF 2X II Extender Telephoto Accessory - Image 2](https://m.media-amazon.com/images/I/61Xq4gtx2yL.jpg) ![Canon EF 2X II Extender Telephoto Accessory - Image 3](https://m.media-amazon.com/images/I/610MT8D1XiL.jpg) ![Canon EF 2X II Extender Telephoto Accessory - Image 4](https://m.media-amazon.com/images/I/71j20GGU8VL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Quality way to double your focal length *by T***C on April 27, 2010* The Canon EF 2X II telephoto extender is a reasonably inexpensive way to double the focal length of some of the Canon lenses. There are a few pro's and con's when considering going this route. The image quality of this extender is extremely good and maintains the image quality of the lens that is attached to. I found it to be far better than other lessor cost extenders. There are a couple of caveats to be aware of before purchasing this extender. First, it is NOT compatible with ALL Canon lenses. Check the Canon site for the specs on this extender and the list of compatible lenses. It is mainly a physical problem of the front element of the extender lens sticking out too far to physically connect with some lenses because their rear element is too far back and it clashes (or crashes) with the extender. Secondly, be aware that a 2x extender will cause a 4x light loss through the optical system (i.e. 2 f-stops slower). This is true of any extender - it's the law of optical physics. Unless your main lens is better than F5.6, the camera will not have enough light to autofocus, so be prepared to manually focus your camera when using a 2x extender. That being said and all of these conditions being understood, the Canon EF 2X II extender is a great way to double the power of your telephoto lens. ### ⭐⭐⭐⭐ Works Perfect with 2.8 70-200 *by G***N on May 25, 2013* Because of the mixed reviews about this extender "Canon EF Ex II" I had to buy it to see for myself. I used my canon 70-200 MK II 2.8 on my 5D Mk II and I have to admit I hate the softness and especially the soft edges not to mention the slow focus. It doesn't come close to the performance we all know and love with this fine quality lens. I decided to pack it up and ship it back to the seller I was so disappointed. I'm sure many will think I did something wrong or expected to much, this isn't the case since many others have testified to the same results. If you're happy that's great, I wasn't. I decided to at least try it on my Canon 40D which has a 1.6 crop factor which extends the focal length to 640mm and Viola... the quality is absolutely stellar!!! Not only are the images sharp as a tack with images like the 70-200 without extender, and it focuses extremely fast. Needless to say I'm extremely happy and 40D's aren't very expensive, so if you are unhappy with the 2x II and you can afford a 40D that might be an option considering you get a second camera, longer focal length, fabulous images, for less than $400 on average. Just consider the the extra cost like buying two extenders. Why the four stars? I feel it should work on my 5D MK II with equal results, and it doesn't! Regards, Urban Picasso ### ⭐⭐⭐⭐⭐ Tele-converters have come a LONG way! *by T***Y on September 21, 2010* Shortly after I purchased my first SLR film camera (some time around 1977) I bought a 2X tele-converter hoping to use it with my 70-200 f/4.5-5.6 zoom lens. It was an off-brand (Spiro-Tone if I remember correctly) and it was awful! It created barrel-distortion and degraded the image far more than I had expected. Well, they have come a long way in the decades since. This 2X extender is designed to work with both fixed-focal length telephoto lenses and long zooms. I purchased this originally to use with my 100-400 zoom and even though the effective maximum aperture at 800mm was f/11 the resulting image was tack sharp. Recently I rented a Canon 400mm f/2.8 L lens and tried it with this converter. Wow!!! It was incredible! I had it mounted on a good sized Gitzo tripod and was able to photograph a small bird from a great distance and it still filled the frame. The effective aperture was only f/5.6 which is what you would expect for a 800mm lens. I hope to purchase a 300 or 400mm f/2.8 in the future and I am sure that I will be getting even more use out of this excellent optical accessory. ## Frequently Bought Together - Used Canon Extender EF 2X II - Canon Mount Adapter EF-EOS R - Canon EF 50mm f/1.8 STM Lens --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.th/products/2453784-canon-ef-2x-ii-extender-telephoto-accessory](https://www.desertcart.co.th/products/2453784-canon-ef-2x-ii-extender-telephoto-accessory) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-06-10*