I have no specific knowledge of how the Oly autofocus works but can
speculate on purely mechanical grounds that the operation is a dance
between camera and lens. The camera is determining focus or near focus
at a point when the lens' focusing motor is still running. The lens can
start, stop, accelerate or decelerate or reverse the motion. If it's a
fast running process there may be coasting time involved between the
time the command is issued to stop and the actual stoppage. I suspect
all of these behaviors can be fine tuned by changing parameters in both
camera and lens.
Chuck Norcutt
Dan Mitchell wrote:
>> If not, is the auto focus precision of the 12-60, or any other Olympus
>> digital lens, a function of the mechical / electronic interaction of the
>> lens itself in combination with the camera body upon which it is mounted?
>> How can any software downloaded on one's computer upgrade the auto focus
>> capability of on's camera and lens?
>>
>> For any new software to be effective would it not have to be downloaded into
>> the camera itself?
>
> Depends on how the lens works. If the camera sends the lens a signal
> saying "focus yourself at X feet", then it's entirely up to the lens how
> it translates that signal into motion of the motors inside itself --
> maybe it has improved knowledge of the amount of torque required to
> reposition its elements to focus at X away, so it can accelerate faster
> or something?
>
> Theoretically you could time things so that based on how long it takes
> the lens to stop itself down, it could start stopping down before it's
> focussed, so that as long as the stop-down and focus happen at the same
> instant, you reduce shutter lag. That sort of thing.
>
> On the other hand, if the lens is dumb and just knows "focus further"
> -vs- "focus nearer", then it's harder to see what a firmware upgrade
> could do.
>
> -- dan
>
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