[LargeFormat] roll film back

[philip Lambert]

I just measured the aperture in the 6x7 rollfilm back of my Linhof 6x9 and
it is 56mm by 72mm.  Your ground glass will obviously be a custom job to fit
your own groundglass holder, but perhaps you could start with a displaced
ground glass from a 5x4 as some of these are ruled in squares and others
even have the 56x72 format drawn on them. Old glass can be tricky to cut
with a diamond or wheel because it seems to become brittle as it ages.  A
modern bright screen is a good idea; modern ground glass is brighter and
finer grained than old ground glass, to judge from my experience of ancient
and modern Linhofs.  Philip
----- Original Message -----
From: "Ted" <tedburford@yahoo.com>
To: <largeformat@f32.net>
Sent: Friday, March 02, 2001 9:50 PM
Subject: Re: [LargeFormat] roll film back


> > I thought 56mmx 72mm was the right standard size of the image. Your
ground
> > glass wants to be bigger overall so you can mount it by its edges. Mask
down
> > to 56x72 or draw lines on the g.glass.  Can't you get hold of a used RB
> > screen?  Philip
>
> Philip,
>
> The focus screen for an RB 67 is Square 7X7 CM.
> I machined a Ground Glass holder today out of Aluminum on the milling
> machine. I made the place for the Ground Glass .125" larger than the
> hole all the way around.
>
> Ted
>
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