So I now realise.

Thanks

John

On Mon, 22 Mar 2004 15:18:08 -0500, Peter J. Alling <[EMAIL PROTECTED]> wrote:

It doesn't know the ISO you do. You set the lens opening to account for the ISO the flash unit delivers
light to match. If you set the lens opening incorrectly you'll get and incorrect exposure.


John Forbes wrote:

Correct me if I'm wrong, Bill, but the AF280T has, I believe, three modes: TTL, auto and manual.

With TTL, it takes its instructions from the camera. With auto it decides when to shut off, based on light received through its sensor, and the ISO. On manual, it's just full power (or a fraction).

I can't see how the gun can have an "auto" mode if it doesn't know, and use, the ISO.

Pray enlighten me.

John

On Mon, 22 Mar 2004 09:47:51 -0600, William Robb <[EMAIL PROTECTED]> wrote:


----- Original Message ----- From: "John Forbes" Subject: Re: Will adjusting the iso on the af280t give me fill flash


If the flash is on manual, it will take no notice of the ISO

settings, it


will just deliver full power or an appropriate fraction of full

power if


it has 1/2 or 1/4 power settings.

If you want to use the ISO settings to adjust the flash output,

then use


auto (on the flash), and, as you suggest, play with the ISO

settings.


Make that output settings.
The calculator on the back of the AF 280 doesn't do anything to the
flash output.
The flash has two auto ranges, the guide scale tells you what the
minimum/maximum ranges are for them at various ISO settings, nothing
more.

William Robb












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