On Tue, Mar 27, 2007 at 08:07:32AM +0200, Michel Carrre-Ge wrote.. > P. J. Alling a écrit : > > Pentax engineers put a ring inside the f2.0 lenses to restrict the > > aperture. > > > No additional ring > I have the two models which I dismounted for cleaning. > There is a ring which maintains the plates of the diaphragm: that of the > 2/50 A simply a smaller central hole. > It is visible that the diaphragm opens broader than this hole.
Right.. I have been staring at my 2 lenses from the outside (no autopsy) and there is no obvious difference to be seen. Wilko -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
