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RE: [OM] OT Auto Cam Questions

Subject: RE: [OM] OT Auto Cam Questions
From: "Daniel J. Mitchell" <DanielMitchell@xxxxxxxxxxxxx>
Date: Fri, 8 Feb 2002 08:45:24 -0700
> The passive AF means that it's not using any kind of focusing aid (like an
> infrared assist light). And the distance is just the limit to how close it
> will work.

 Um.. suddenly I realise that I don't understand autofocus. How _does_ it
work? I assumed that it bounced an infrared beam off the thing it was
focussing on and timed pulses (or something) to judge the distance; that's
why they get confused by windows in the way, etc.

 It sounds like this is wrong, if the IR light is there to 'assist' things,
though -- and the mention of horizontal -vs- vertical sensors confuses me
even further.

 So what does autofocus really do?

 -- dan

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