Can onyone help me resolve this problem please? I have a set of PKA-AF fit
extension tubes (Jessop branded) which seem to have the necessary electrical
contacts passing through them to suit A-Series lenses and the *istDS. If I
fit my old standard Pentax-A 50mm f1.7 PKA lens directly to my *istDS the
lens works as expected with the aperture ring set to 'A'. If I then place
any or all of these tubes between the camera and lens the Av indicator on
the camera shows only -.- and obviously reduces the capability of the
outfit. Does anyone ...