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Re: [OM] OM TTL flash behaviour

Subject: Re: [OM] OM TTL flash behaviour
From: Moose <olymoose@xxxxxxxxx>
Date: Thu, 19 May 2011 11:02:04 -0700
OMG!

Hi John, we haven't heard from you in years!

Nice of you to drop  in and let those of us who wondered know that you are OK.

Moose

On 5/19/2011 10:40 AM, John Lind wrote:
> The amount of light admitted to the film plane in TTL is ambient @ selected 
> f-stop&  1/60th plus the necessary duration of flash to satisfy the TTL 
> metering.
>
> There are some occasions for desiring to increase ambient by using 1/30th 
> (versus opening aperture by a stop) and you cannot do this in TTL, only in 
> "Auto" or "Manual" modes. TTL always sets shutter speed to 1/60th *if* it 
> needs to fire the flash to get enough light. If ambient is sufficient TTL 
> will use shutter speed 1/60 or faster based on selected aperture; flash can 
> be forced by stopping down if possible, the increased DoF is acceptable, and 
> flash is desired. I've done the latter to force fill by stopping down just 
> barely enough to activate the flash.
>
-- 
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