Yes, that's a more elegant way of explaining it. My only thought was that the original dents (stops) of the M & K lenses were not precisely linear. They didn't need to be. Regards, Bob S.
On 3/26/07, Patrice LACOUTURE (GMail) <[EMAIL PROTECTED]> wrote: > Hi Bob, > > As I understood it (but I may be wrong): > > * With A-lenses and A-bodies in A-mode, the body only pushes the lens > lever the right amount to reach the right aperture, and that's why the > lever's operation must be linear. > > * With pre-A bodies and/or pre-A lenses, the body actuator always pushes > the lens lever all the way through, which results in the lens closing to > the aperture preset on the ring. So it doesn't make any difference > whether the lever effect is linear or not, in this case. > > This might explain why you could never see any difference. > > Regards > > Patrice > > Bob Sullivan a écrit : > > [...] > > > > In practice, I've wondered about it, but never been able to notice any > > difference in the slides my cameras produced with "A" vs K or M > > lenses. I always attributed any differenced to the light transmission > > qualities of the lens itself. > > > > Regards, Bob S. > > > > On 3/26/07, Igor Roshchin <[EMAIL PROTECTED]> wrote: > > > >> Hello! > >> > >> Sorry for bringing up this question that may be known to most > >> of the people here. I just realized that I don't know it, and couldn't > >> find the information on the KMP site or elsewhere on the web. > >> > >> This question is about aperture control design. > >> For the A and later lenses that have "A" setting on the aperture ring, - > >> what is the step of the actual aperture setting in this mode? > >> If it doesn't coinside with F-stops or 1/2-F-stops, then is it > >> body-dependent (i.e. is one body more capable to utilize > >> sub-1/2-f-stops then another) or is it standardized? > >> > >> I realize that the motion of the diaphragm actuator in the lens is > >> stepless, so it is up to the body to choose the steps, if any > >> (is it determined by the DAC bitness?) > >> > >> Thank you, > >> > >> Igor > >> > >> > >> > >> > >> -- > >> PDML Pentax-Discuss Mail List > >> PDML@pdml.net > >> http://pdml.net/mailman/listinfo/pdml_pdml.net > >> > >> > > > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
