Sunhawk and I just picked up a pair of Kenko Teleplus DG 1.5x conversion lenses.
I have always been told that with converters (and it said this in the manual as well) any f smaller than f4.5 the af will not work. Not only does it work past f4.5, it worked to the end of the F range of the Quanaray 70-300mm macro zoom. Every time, in the house as well as outside in over cast light. Very cool. Now, if the picks come back as good as everyone says they will, I`ll be a happy camper
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Have mono pod, will bird.... Up to a 450mm now, things look better on the birding front....Still need good light for the faster shutter speeds, but hey, I`ll take it.