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02/11/2006 02:34:37 PM · #1 |
| I just purchased the EF 2X II tele extender. It says its compatible with my 70-200L but that "auto focus will be slowed" - but I'm getting NO auto focus at all. It doesn't even try. What's up with that? Any ideas? |
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02/11/2006 02:40:21 PM · #2 |
From the Canon website:
This 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.
So I guess that the lens must be a F/2.8 or faster to use AF.
The 1.4x II will auto focus w/ F/4.0 according to Canon
Message edited by author 2006-02-11 14:42:33.
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02/11/2006 02:53:35 PM · #3 |
Your camera will only AF with a lens that has a max aperture of or larger than f/5.6. With the TC your 70-200 f/4 has become a 140-400 f/8.
Message edited by author 2006-02-11 14:54:08.
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02/11/2006 02:53:56 PM · #4 |
Hmmmmmm the guy at the camera store said it would work and the lens' instructions say that my 70/200 is compatible and should become a 140/400 f8........
camera store guy also told me it would be compatible with my 50 prime - which it is not - doesn't even fit....
Looks like I'm returning this one. |
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02/11/2006 02:59:51 PM · #5 |
| yeah you can only auto focus till F5.6 which you get with the 1.4x not the 2.0. You need an F2.8 or faster lens to use the 2x with auto focus UNLESS you have a 1-Series camera or if you tape the pins. |
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02/11/2006 07:14:31 PM · #6 |
Originally posted by idnic:
...the guy at the camera store... |
It is sad but many salesmen know everything about selling but nothing about their products. :(
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