[LargeFormat] calculating aperture scale - an easy way?

[Jim Hemenway]

The aperture is calculated by dividing the focal length by the 
(apparent) aperture diameter.

Jim

Timothy Atherton wrote:
> I vaguely remember Richard writing on this once, but can't find it?
> 
> Is there an easy way to calculate an aperture scale for a shutter/lens?  I
> have my 210mm Kowa Graphic in a Copal #1 shutter with an appropriately
> marked aperture scale.  Say I want to put a 150mm Kowa Graphic in to try it
> for a while - is there
> a way to come up with a scale without sending the whole thing off to
> Grimes or somewhere? (I'm not talking about the actual little piece of
> metal for the scale itself - I'll just use a piece of tape or some such
> and mark it - rather the measurements) thanks
> 
> 
>  timothy atherton