I had read that the Super-Takumar on screw mount 1.8/55 and 2/55 were made of it identical; I received this morning my 2me purchase on e-bay, a Pentax SV with this famous Super-Takumar 2/55. And in fact, one sees well inside before the diaphragm the ring to make one under-model of it!! You can se the pics: http://perso.wanadoo.fr/krg/Photo/Images/2-55av.jpg http://perso.wanadoo.fr/krg/Photo/Images/2-55ar.jpg
See of the before oneself doesn't notice really that it partially overlooks the full opening (cf 2-55av.jpg) but in rear-view (cf 2-55ar.jpg), one sees distinctly that the "B" bridle (it appears in clear) is closed more that the diaphragm entirely open "D" ! Funny marketing, this 2/55 was therefore dearer (a ring) that the 1.8/55 higher in range. Michel,
