I noticed my 1.7x AF converter doesn't autofocus with T-mount lenses. It does autofocus with M-series lenses. The only difference I can imagine is the K-mount on a M-series lens is electrical conductive and the T-mount is made of (isolating) anodized Aluminium. I feel temped to use fine abrasive paper to remove the anodized layer on an old T-mount or short circuit two or more contact on the K mount. Would that make any difference? Maybe dangerous for the D body?
Toine
