I suspect that one of the real impetuses behind this move is precision. I believe it is impossible to achieve precise enough aperture control with auto settings via the old K-mount protocol. Obviously, Pentax goes the fullly auto route with the *ists but they have provided choices for those who want to use precise manual aperture controls with the MZ-5/3 and the MZ-S.
I can understand the advantage of doing the aperture thing electronically, like Canon & Minolta systems. However, the current *ist & FAJ lenses still use mechanical coupling which is no different from SF, Z or MZ series. How much more precision could it be?
regards, Alan Chan
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