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

[philip.lambert]

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
----- Original Message -----
From: "Jim Hemenway" <Jim@hemenway.com>
To: <largeformat@f32.net>
Sent: Monday, April 07, 2003 2:40 PM
Subject: Re: [LargeFormat] 90mm Schneider f5.6 Super Angulon vs f8


> Philip:
>
> In a conversation with Bill Maxwell about a week ago, when discussing a
> fresnel screen for my 11x14, he told me that the fresnel would have to
> be used on the back of the groundglass, that is to say on the
> photographer's side of the groundglass.  If used in front of the
> groundglass the focus will be wrong... unless the wooden frame is routed
> to a different depth so that the fresnel will be positioned to be where
> the groundglass had been previously.
> --
>
> Jim - http://www.hemenway.com
>
>
>
> "philip.lambert" wrote:
> >
> > I am not using a Beattie screen as in the UK such a 5x4 screen is
absurdly
> > expensive. The ground glass has the 2x3 format coated with a v.thin
deposit
> > of vaseline with a fresnel on top.  Not bad. I had a Boss screen on my
69
> > Linhof which was good and then I bought one with plain etched glass that
was
> > just as good. Odd.  I've been told to try the fresnel on the underside
as
> > that way the circles are less obvious but I would presumably have to
trim
> > and fix it to the glass surface with adhesive at its edges rather than
> > displace the focussing glass outwards.  I think the oldfashioned black
cloth
> > is called for.  But some of the lenses I have collected are f3.5 or f4.5
and
> > it makes a real difference. PL
> > ----- Original Message -----
> > From: "Vince Dobson" <manitec@bellsouth.net>
> > To: <largeformat@f32.net>
> > Sent: Monday, April 07, 2003 1:06 AM
> > Subject: RE: [LargeFormat] 90mm Schneider f5.6 Super Angulon vs f8
> >
> > > Are you using a Beatti intescreen?  After replacing mine with one, I
no
> > > longer long for a lower F Stop lens - my F8's and F9's are plenty
bright
> > > enough now - This would be a much cheaper alternative.
> > >
> >
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