Re: Paper negatives

Matti,

Over a year ago I found a web site (now long forgotten) describing a pinhole camera with about a half dozen
negatives on hinged dividers. The "hinge" was probably just a piece of tape, and each paper negative was mounted
on a thin, opaque divider. (Paper in a pinhole camera will transmit enough light to fog the sheet behind it.)
The approach was that each divider had a thread tied to it, and the photographer could use the six protruding
(and numbered) threads to swing the next paper negative up into position; or maybe it was to let the just exposed
one fall out of the way.

This approach changes the "focal length" of the camera a little bit for each exposure, so you will want to keep
the stack of negatives as thin as possible. Also, hinged plates get a little tricky if you want to use curved
film planes.

I finally retreated from these approaches and built a wooden box that accepts 4x5 film holders.

Good luck,
Bob
---------------------------------
Matti wrote:

>
> Hi all
>
> I have an opportunity to do some woodwork next two mondays and of course
> I decided to build a camera. But. Time is running short and I couldn't
> find a filmholder off-the-shelf here in my home town. Another issue is
> that I have never developed sheet films and using photographic paper is
> easy to develop in the darkroom because you can have safelight.
>
> Some time ago there was a discussion using filmholders and photographic
> paper, but if I recall correctly, the paper is too thick to be used in
> the holder. Now I'm asking for assistance how to use photographic paper
> so that more than one picture can be taken without going to change the
> paper in the darkroom. One idea came to me looking at joycam's film.
> Could the papers be stacked (maybe a opaque sheet between the papers,
> and after exposing one, draw it with some method to a safe place (I'm
> thinking of letting the paper just fall from the rear to the bottom of
> the camera.) If there's this opaque sheet between the papers, the paper,
> facing down and covered with the black sheet, this should prevent it
> from exposing when taking new pictures. How to do this in practice is
> open, but it might be possible. Any ideas are more than welcome.
>
> I have 120 pinhole camera already, so I'd really would like to build a
> larger format camera.
>
> Any _fast_ help appreciated :-)
>
> Thanks
>
> -matti
> mjkoskin@koti.soon.fi
>
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Received on Wed Mar 6 19:14:55 2002