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#1
December 7th 04, 11:08 PM
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Min aperture for on for 20D?
I know my Rebel will not autofocus my 100-400 at f/5.6 with my 1.4x TC (at
f/8.0) but it works fine on my 1D (without taping over pins of course) What about the 20D, and what do you call this? 
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#2
December 8th 04, 01:14 AM
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"you know who maybe" wrote in message
... I know my Rebel will not autofocus my 100-400 at f/5.6 with my 1.4x TC (at f/8.0) but it works fine on my 1D (without taping over pins of course) What about the 20D, and what do you call this? Only the 1 series will AF at a minimum aperture of less than 5.6, i.e. f8. The 20D is the same as the Rebel, f5.6. Unless you use a nonCanon TC, like Kenko, that doesn't report the correct aperture to the camera. Then it will AF, albeit not well, at apertures smaller than f5.6. -- Skip Middleton http://www.shadowcatcherimagery.com
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