You miss my point, the design constraints placed on lenses to maintain
both autofocus methods are greater than those placed on the camera body
to retain legacy support for older lenses. In one you have to maintain
mechanical linkages, where as in the other you only have to run wires so
to speak. Why do you think hydraulic controls replaced mechanical rods
and cables in automobiles, and aircraft not because they were better,
though though they are, but because it's a lot easier to run flexible
tubing. Now these same systems are being replaced by "fly by wire"
systems, because it's much easier to run a wire. However some people
are just blind. That's one of the advantages of the in lens focusing
motor. In the camera body the aperture simulator is a sensor on the end
of a wire.
jim wrote:
> On Sun, 11 Feb 2007 02:19:22 -0500, P. J. Alling wrote:
>
>
>> Actually it makes more sense from a cost and design perspective to drop
>> the drive shaft from the lenses with built in focusing motors than
>> dropping the aperture simulator from the camera body. I expect that the
>> screw drive's days are numbered.
>>
>
> >From the pics I have seen, the new DA* zooms don't have an aperture ring
> >thus making the aperture simulator redundant on these lenses.
> >From the drive shaft point, Would say that they will dissapear one day.
>
> James
>
>
>
>
>
>
>
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