Re: On USM and KAF2/KAF3 (was Re: End of K-mount?

[Alan Chan]

Perhaps it could be done with a switch on the lens to determine which AF method was used? Something like "AF/USM" switch. When the switch was in "AF" position, the power for the "USM" would be disconnected and the lens acted like a regular Pentax AF lens. When the switch was set to "USM", the conventional AF mechanism would be disengaged and USM would click in. But that creates a dilemma, since future AF bodies should or might support current AF lenses, you might actually have the choice to use either AF methods when USM lenses were mounted on USM bodies. The situation is a bit like digital/analog flash system. Nikon chose to integrate analog support in digital flashes while Pentax chose to integrate analog support in AF digital bodies. However, if Pentax would ever release USM lenses, it would be highly likely to follow what Nikon did - USM lenses must be used on newer bodies which support both AF method.

regards,
Alan Chan

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