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

[Jim Hemenway]

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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