----- Original Message -----
From: <rdk@xxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, October 09, 2000 1:45 PM
Subject: Re: [OM] iS-10(0) / iS-20(0) / Centurion AF Question
Roger Key wrote:
> I had assumed that all the newer AF cameras that have a possibility for
> continuous drive would also default to continuous AF; otherwise subjects that
> came closer would go out of focus in subsequent frames.
Neither of the simple iS models have continuous drive, and AFAIK nor has the
Centurion.
> As the iS-300 came after the Centurion, and only the 300 has been specified to
> have predictive autofocus, I have assumed that the Centurion does not have it.
> The big question for me is, is predictive autofocus only necessary for things
> that move really fast? My copy of 'Popular Photography' that has a test of the
> IS-3 DLX from the time of introduction, says that the autofocus is fast enough
> for 20mph/32kph cyclists but not more.
I've had trouble a couple of times to get my iS-3000 to focus on fast moving
jets
if they're approaching or leaving. A straight pass with relatively slow changes
in
distances are normally no problem, and due to the security regulations this
usually is the case at air shows. Don't know how the iS-30(0) or the Centurion
performs under similar circumstances, but according to the July '99 Pop Photo
test
of iS-30 you'd really need continuous drive to complement the predictive
autofocus. This is what they wrote:
-quote-
"Track a moving subject
A feature new to the IS-30 is tracking focus. Again, this will set no speed
records against the predictive AF on top SLRs, but it does enable the camera to
track subjects moving at moderate speeds relative to the camera. With it, our
intrepid photographer was able to keep continuous focus on the sports car up to
the moment he began a panned exposure.
Another point to be made about the continuous tracking AF is that it is single
shot - once you make one exposure, you have to lift off your shutter finger
nearly
completely, then press again, to initiate another exposure. It can take a second
or more. So action sequence shots are not in the IS-30's bag of tricks."
-unquote-
Per Nordenberg
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