I didn't say it was additional. Michel Carrère-Gée 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. > > Michel > > >
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