Quote:
Originally Posted by nikau
I bought a focus-confirm adapter and was unhappy with it. I did some research with the help of Mr Google and found that generically they only work with the lens at max aperture and may or may not work with zooms. Mine will not work with either of my two Leica zooms; nor will it work with my 400mm Telyt. It will not work with my 2x apo extender fitted to any lens. Apart from that, it's fine! Mine came via ebay from big_is in Hong Kong (who provided a very fast service).
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It may depend on the camera you are mounting it to. Only the 1D series cameras have AF sensors sensitive enough to focus lenses slower than f5.6. On the Canon consumer level cameras, though not related to your problem directly, they will disable AF if a tele-converter is used and the combination of lens/converter is slower than f5.6.
On all the Canon cameras, the center point is the most sensitive, so you may try activating only the center point if that is possible with the focus confirm adapter fitted.
Robert