Re: pinhole coverage issue

A 0.44 mm aperture placed 145mm from the film will cover about 500 mm. The
formulas is that the coverage equals about 1 1/2 times the "focal length"
either side of center. Focal length is just the distance from the pinhole to
the film. It's really a misnomer because nothing focusses, it's just the
distance at which the light waves mesh best, for the optimally sharp image.
----- Original Message -----
From: "Achal Pashine" <achal@stanford.edu>
To: <pinhole-discussion@pinhole.com>
Sent: Monday, April 15, 2002 6:31 PM
Subject: [pinhole-discussion] pinhole coverage issue

> Hello all,
> I am working with 4X5 film format (at 145mm length) with 0.44mm pinhole
> (~f/300). How do I find out what is the coverage of the 'lens' (is it
> equivalent to 50mm, 100mm 35mm camera lens?). How to make pinholes which
> will give wider angle coverage? I have seen shots taken with extreme wide
> angle pinholes. How does one do that?
> Does formula "Pinhole diameter = 0.0073 * SQR(focal length)" give some
known
> coverage?
> thanks,
>
> Achal
>
>
> ----- Original Message -----
> From: "Ray Esposito" <brassring@brassring.org>
> To: <pinhole-discussion@pinhole.com>
> Sent: Monday, April 15, 2002 7:58 AM
> Subject: Re: [pinhole-discussion] developing tanks/pinhole cam [was paper
> negative tricks]
>
>
> > Jim - there is no pricing on the XD. Ray
> >
> > ----- Original Message -----
> > From: "Jim Kosinski" <merlin@paintcancamera.com>
> > To: <pinhole-discussion@pinhole.com>
> > Sent: Monday, April 15, 2002 8:12 AM
> > Subject: Re: [pinhole-discussion] developing tanks/pinhole cam [was
> > paper negative tricks]
> >
> >
> > > The Merlin-XD pinhole camera is made from a film developing
> > > tank. Check the website for details,
> > > www.paintcancamera.com
> > >
> > > Jim K
> > >
> >
> >
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>
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Received on Tue Apr 16 07:24:43 2002