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Old Dec 1, 2005, 11:30 AM   #1
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I I have a canon 20d and purchased a 500d close up lens. It does not work with a 70 - 300 zoom lens in autofocus. Do I have to use manual focus when taking close ups with that filter.
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Old Dec 6, 2005, 3:54 PM   #2
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I have the 20D and the 500D, but I have the Canon 70-200, not 70-300. It does autofocus fine.

1) Does your 70-300 autofocus work w/o the 500D?

2) Can you see the autofocus attempt to find focus? Does it move?

You have to remember that the 500D has a very narrow DOF and will only autofocus within a few inches (3-4 inches of travel appox.).

Hope this helps.
Rick
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Old Dec 13, 2005, 3:36 PM   #3
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Hi,

Thanks for the reply. The 70-300 autofocus works well without the 500d. With the 500d it goes crazy and can't find the focus. Maybe what you are saying is correct about the debth of field but I cant seem to get any pictures at all.


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Old Jan 10, 2006, 5:42 PM   #4
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Try this. Mount your camera on a tripod. Attach the 500D. Now focus it on something using manual focus. Now unfocus it manually. Now turn on autofocus and press the shutter butter half way. Does it focus?
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