Canon EF 2X II Extender Telephoto Accessory
by Canon
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Category: Digital Camera
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Digital Photo Product Details
Manufacturer: CanonModel: 6864A004
Product features:
- Telephoto extender designed to double Canon EF lens focal length
- Ideal for shooting close-ups from a distance at sporting events
- Weather-resistant and anti-reflective internal construction
- Maintains autofocus with any EOD body with f/2.8 or faster aperture
- Measures 2.8 inches in diameter and 2.3 inches long; weighs 9.3 ounces
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Digital Cameras Photo Reviews of Canon EF 2X II Extender Telephoto Accessory
Customer Review: Does job right at right price
Summary: 5 Stars
This is a high quality piece of glass, and it's not a coincidence that its color is white, since it is by all means an L series glass and L series only compatible (more on Canon website). A reviewer here underrated this lens for not working as well as he expected on a 100-400 F/4.5, well, I thought it was common knowledge that a 2X extender will remove 2 f/stops and the quality of the final image will somehow suffer, it's called... what you pay for. Otherwise no one would be buying the much more expensive 500mm, 600mm, etc. lenses. I demoed this extender in Yellowstone for a few days with a Canon 70-200 L f/2.8 IS lens and even after I added a polarizer the autofocus was still very fast. All the Canon people I met told me that with a 100-300mm f/4.5 you should use a 1.4X extender and that the 2x is not for that lens. Guess it's useful to do a little bit of homework before investing in expensive technology.
As for the quality of the images taken with the 70-200 above coupled with the 2X I can tell you that you could see it in lab tests but not with a naked eye (Unless you're an eagle maybe).
* Update October 19 2007
I bought the 2X with a Canon 70-200 F/4 non-IS lens and been playing with it for the past 2 weeks. Just as I previously stated the quality remains high; on the f/4 lens the autofocus stops working (as I expected and stated previously) although a friend told me that by blocking one of the pins the autofocus will work although only the central sensor. It's not a big deal to me since I often use manual focus and at the minimum f/8 you get there's still room for error. With my Canon 30D (1.6 crop factor) the image quality is high, surprisingly high, just as I experienced up in Yellowstone at the Canon workshop. So, let's do a bit of math: 70-200 * 1.6 factor makes for a 112-320mm effective range, add the 2X extender and it becomes 224-640 at f/8. So yesterday I took photos of a Bull Moose at 640mm effective with a cheap tripod ($20 BestBuy, horrible, but better than nothing) and the quality of the photos is much better than using my Tamron 70-300 ( effective 112-480) f/3.5 lens which I'm definitely going to get rid of.
This piece of glass definitely deserves 5 stars and not a bit less. Now I can't wait to take it to my trip to Costa Rica's jungle.
Description of Canon EF 2X II Extender Telephoto Accessory
The Canon 6846A004 EF 2X II Extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4x II). Features a new seven-element design, and same weather-resistant design and anti-reflection internal construction as the new EF 1.4x II. The EF 2x II doubles the focal length of any lens it's mounted to, and reduces its effective aperture by two stops. With the EF 2x II, AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture, and compatible Image Stabilization lenses maintain the IS feature when used with any current EOS camera. Order the Canon 6846A004 EF 2X II Extender today!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
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