[LargeFormat] Re Worldwide Pinhole Photography

[Les Newcomer]

Hey sounds like a great ebay auction for next April fools.  "A pinhole
center filter!" 

while I won't say it's impossible, the aperture is so bloody small that
creating a centerfilter would be difficult indeed. An you're already into
the several seconds exposure, another 2 stops will put you into the minute
mark with reciprocity.

Since pinholes don't need to focus, take a compass and measure the distance
from one wall to the next, then draw an arc in the botom of the box. Now
using more cardboard, construct a curve along the arc.  This way the film
will be the same distance from the aperture, and while fall off will still
exist, it will be greatly  diminshed.  You might get some odd shapes at the
very ends too, since the film will see an elipse instead of a circle.

Les.

> From: "philip.lambert" <philip.lambert@ntlworld.com>
> Reply-To: largeformat@f32.net
> Date: Sat, 13 Apr 2002 11:53:34 +0100
> To: <largeformat@f32.net>
> Subject: [LargeFormat] Re  Worldwide Pinhole Photography
> 
> I am wondering whether I could use a pinhole camera as an ultrawide camera.
> I thought I might tape a suitable length of 120 rollfilm negative inside a
> shoe box on the long side.  There is sure to be a falling off in
> illumination towards the edges. In conventional ultrawide photography the
> use of a graduated centre filter is suggested to reduce the light in the
> middle region of the negative.  Is such a filter needed with a pinhole
> camera and if so what size and how is it to be contrived? Philip
> 
> 
> 
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