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[OM] Re: om4ti, continuous shutter speeds?

Subject: [OM] Re: om4ti, continuous shutter speeds?
From: "Timpe, Jim" <Jim.Timpe@xxxxxxxxx>
Date: Wed, 25 Aug 2004 13:23:30 -0700
The spots are just defined points in the frame while you're composing your
shot.  The cpu determines the 'correct exposure' for the average of your
selected spots, then lets the OTF sensors shut the second curtain when that
predetermined 'best average' exposure is achieved.

-----Original Message-----
From: Roland Ruehl [mailto:roland.ruehl@xxxxxxx] 
Sent: Wednesday, August 25, 2004 1:07 PM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: om4ti, continuous shutter speeds?


Unfortunately I do not own a 4. But I have always wondered how 
off-the-film measurement (and dynamic speeds) works together with 
multi-spot measurement. Say, for example, you have defined two spots, 
and then during a long exposure, the spots change light differently, 
what happens ? Does the camera simply perform an overall level adjustment ?

Roland.

Moose wrote:

>Think about it a moment. You are designing the circuit. It is really
>easy to simply have it wait until sufficient light has been sensed and 
>release the 2nd. curtain in TTL or simply hold the shutter open for the 
>time calculated based on the light level sensed when the spot buton was 
>pressed. In order to pick specific speeds, you actually need more 
>circuitry and programming to correctly pick a specific shutter speed 
>from a list. In other words, it takes more design complexity to make a 
>system with a higher average exposure error. So of course nobody did that.
>
>The dots in the viewfinder resolve to 1/3 stop, but they are just an
>approximation of the actual stepless speeds in auto.
>
>Moose
>
>Mike Lees wrote:
>
>  
>
>>What about in spot mode and the multi-spot average? Are shutter speeds 
>>still
>>continuous despite the exposure being determined prior to exposure? The
dots 
>>in the viewfinder would suggest a resolution higher than the standard
shutter 
>>speeds.
>>
>>    
>>
>
>
>
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