[rollei_list] Re: Rollei Flash
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 10 Jan 2008 18:05:06 -0800
----- Original Message -----
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, January 10, 2008 11:17 AM
Subject: [rollei_list] Re: Rollei Flash
I goofed!!! Guide numbers vary as the square root of
the ratio of speeds, not directly with them. For instance,
if the GN for an ISO-100 film is 100 the GN for an ISO-200
film is 140, not 200.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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