[LargeFormat] Re Worldwide Pinhole Photography

[Guy Glorieux]

----- Original Message -----
From: "Les Newcomer" <lnphoto@twmi.rr.com>
To: <largeformat@f32.net>
Sent: Sunday, April 14, 2002 3:01 PM
Subject: Re: [LargeFormat] Re Worldwide Pinhole Photography


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

Les,
Make sure that you advertise them as "Used but in EX+ condition" rather
than as "New"!  You'll make even more money that way!   -:))

Phil,
The ratio of useful exposure diamiter to focal length is about 3.5 to 1.
Of course, a concave shape will solve most of it, but you'll still lose
the image because as the angle moves from straight vertical to sideways,
the circle of your pinhole becomes oval and less light is allowed
through.  In addition, the thickness of the material that you use will
eventually block light on either sides.
An interesting experiment with your shoebox is to put your pinhole on
the short side of the box and your emulsion along the long side of the
box.  It will give you anamorphic images which sometimes can be
stunning.

Cheers,

Guy
>
> 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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