[LargeFormat] 90mm Schneider f5.6 Super Angulon vs f8

[philip.lambert]

Understood but if the fresnel screen is fixed to the rear of the ground
glass without displacing it forward the plane of focus might be unchanged. I
attached  a fresnel screen by its edges on the back of a ground glass with
instant glue and maybe I could try attaching a screen by its edges on the
front of the glass.  The question remains does the plane of focus change and
experiments need to be done.  I have a Century Graphic that reached  me with
a fresnel on the front of the screen which pushed the glass backwards and
when I compared that one with a plain CG back there was a distinct
difference.  PL
----- Original Message -----
From: "Jim Hemenway" <jim@hemenway.com>
To: <largeformat@f32.net>
Sent: Monday, April 07, 2003 5:59 PM
Subject: Re: [LargeFormat] 90mm Schneider f5.6 Super Angulon vs f8


> It has to do with the surface which is used for focusing, being at the
> same plane as the film will be when it's in the filmholder and in the
> camera.
> --
> Jim - http://www.hemenway.com
>
>
>
> "philip.lambert" wrote:
> >
> > Very interesting.  I must experiment and see if the point of focus
changes.
> > I have two old SP Graphics and will see what happens. PL