Thomas Bantel wrote:
> While, with an extension tube, the nominal max aperture communicated
> to the lens will not change, the effective max aperture will. So this
> means, an extension tube will not prevent the camera from *trying*
> to AF, but it will lower the efficiency of AF just like using
> a slower lens with a third party TC.
This has in fact been my experience in the field. Even with a fast lens, use of an
extension tube often leads to some measure of hunting (depending on light and
subject), although the AF still works.
fcc
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