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.
Michel -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
