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Author Topic: AF at aperture 8 possible on other Cameras too?  (Read 1958 times)

xps

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AF at aperture 8 possible on other Cameras too?
« on: May 01, 2013, 02:18:43 AM »
Does anybody know, if it would be technically possible that the AF is working on an aperture of 8 at other Canon Cameras too?

Some month ago, the GO where I am working bought some Cams for documentation. There we were definitifly told, that it is technically impossible to use the AF on an lens thath has an beginning aperture of >=8 on the 5D MK3. - Now it is possible. Interresting.

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AF at aperture 8 possible on other Cameras too?
« on: May 01, 2013, 02:18:43 AM »

Mt Spokane Photography

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Re: AF at aperture 8 possible on other Cameras too?
« Reply #1 on: May 01, 2013, 04:59:40 PM »
Most of the ones I've had work and AF slowly but reliably at f8.
 
 
 You can do one of two things.  Either tape the pins that communicate aperture to the camera, or get a Kenko or other third party TC which doesn't tell the camera that aperture is smaller than f 5.6.


Mt Spokane Photography

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Re: AF at aperture 8 possible on other Cameras too?
« Reply #3 on: May 06, 2013, 11:20:20 AM »
sounds tosh to me
Great and helpful post.

neuroanatomist

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Re: AF at aperture 8 possible on other Cameras too?
« Reply #4 on: May 06, 2013, 12:55:46 PM »
sounds tosh to me
Great and helpful post.

Most of his posts are similarly 'helpful'. And a signature full of links. Imagine that...   ::)
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Marsu42

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Re: AF at aperture 8 possible on other Cameras too?
« Reply #5 on: May 06, 2013, 03:35:49 PM »
Some month ago, the GO where I am working bought some Cams for documentation. There we were definitifly told, that it is technically impossible to use the AF on an lens thath has an beginning aperture of >=8 on the 5D MK3. - Now it is possible. Interresting.

The af performance with narrower aperture simply drops, meaning slower (with a Canon tc) or less reliable (with a Kenko tc) af. As proven by the pin taping method, simply disabling af in these cases is mainly marketing to sell the 1d/5d3 cameras and more expensive (i.e. wider aperture) tele lenses.

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Re: AF at aperture 8 possible on other Cameras too?
« Reply #5 on: May 06, 2013, 03:35:49 PM »