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RE: [OM] Flashmatic

Subject: RE: [OM] Flashmatic
From: "Wayne Harridge" <wayneharridge@xxxxxxxxxxxxxxx>
Date: Tue, 23 Jan 2001 21:14:49 +1100
Ian wrote:

> to be adjusted in view of the film speed.  So if I have a flash with a
> guide number of 20 (ISO 100 in m) and I'm using ISO 400 film, I should
> use a guide number setting of 40 (m).  Is that right?  I quickly

Correct, the Guide Number takes account of the film speed.  For a set flash
output you can calculate the Guide Number for a different film speed as:

GN = ISO100GN*SQRT(ISO/100)

Wayne Harridge
Ivanhoe, Victoria, Australia
http://members.optusnet.com.au/~w_harridge/


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