Hi Matti, Matti Etelapera wrote: > > http://www.dpreview.com/news/0303/pma2003/pentax/istd-lensmount.jpg > > In this picture the FAJ 18-35mm seems to have atleast a mechanical > diaphragm actuator.
Yes, but this is an absolute must. We are talking about the diaphragm coupling, which enables correct metering with all lenses when their aperture ring is set away from the "A" setting. See http://KMP.BDimitrov.de/technology/K-mount/K.html Cheers, Boz
