It's really no more crude than any thyristor flash control that uses an
external cell. .
John Hermanson
Camtech Photo Services, Inc.
21 South Lane, Huntington, NY, 11743-4714,
631-424-2121, www.zuiko.com
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----- Original Message -----
From: "Simon Worby" <simon@xxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Thursday, November 04, 2004 4:39 PM
Subject: [OM] Re: T32 & T20 "hole" in the "O"
>
> Garth Wood wrote:
>
>>> What's the "hole" in the "O" on the front for? I had always sort of
>>> assumed it was a crude internal flash meter of sorts, used to quench the
>>> flash to prevent over-exposure, but from the various explanations it
>>> would
>>> appear not.
>>
>> That's exactly what the hole is for -- when the flash is used in its auto
>> (but non-TTL-controlled) setting.
>
> Right. I see. Hence the f-stop/distance information is a maximum rather
> than a "not less than x and not greater than y".
>
> It must be fairly crude, though. Is the OTF "Auto control by OM-2" more
> accurate?
>
> Also (and sorry for the questions) what is it that creates the signal for
> the rapid flash to indicate correct exposure? Do to the fact that (IIRC)
> it happens on the OM-1N as well as the OM-2N, I assume it's the flash unit
> rather than the camera, even in "Full auto control by OM-2" mode.
>
> Thanks,
>
> Simon
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