Re: couple of pictures

I've daydreamed a lot about shpeircal film planes but I haven't figured out
how to do it. You can do one curved in one dimension, though. The radius of
the curve is the 'focal length" of the aperture. It makes the camera look
like half a wheel of cheese. In the ones I've made like this there is
minimal distortion at the edges and its equally sharp all the way around.
----- Original Message -----
From: Pam Niedermayer <pam_pine@cape.com>
To: <pinhole-discussion@pinhole.com>
Sent: Tuesday, February 27, 2001 2:51 PM
Subject: Re: [pinhole-discussion] couple of pictures

> How spherical would the film plane have to be to get to sharp edges?
> Let's say I'm building an 8x10 pinhole camera (which I am), and wanted
> to build a special curved film holder. Should the spere be around the
> distance from pinhole to film center, the pinhole being the center of
> the sphere?
>
> Pam
>
> William Erickson wrote:
> >
> > I'd guess that edge softness is a product of the fact that the plane of
> > optimal sharpness is a hemisphere centered aroiund the hole, and the
film
> > plane is flat, transecting the optimal image best at the center, or if
> > rounded, not rounded at the same radius.
> > ----- Original Message -----
> > From: Simon Cygielski <simon@wbj.pl>
> > To: <pinhole-discussion@pinhole.com>
> > Sent: Tuesday, February 27, 2001 3:56 AM
> > Subject: [pinhole-discussion] couple of pictures
> >
> > > Hi all,
> > > I've uploaded a couple of my first efforts with my 6x17 cm panoramic
> > > pinhole camera. They're up at
> > >
> > > http://www.pinhole.com/discussion/upload/images/path1.jpg and
> > > http://www.pinhole.com/discussion/upload/images/phones2.jpg
> > >
> > > I built the camera out of a Holga using bookboard to expand it to its
> > > present size. "Focal" length is 7.5 cm. Any comments would be
> > > appreciated.
> > > I also have a question: is the loss of sharpness on the far edges
> > > inevitable, or can it be corrected somehow? perhaps thinner stock?
This
> > > hole was made (fairly carefully) out of a Coke can and sized according
> > > to some pinhole formula (though I forget which one), so it should be
> > > somewhere in the ballpark size-wise.
> > > Thanks,
> > > Simon
> > >
> > >
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> --
> Pamela G. Niedermayer
> Pinehill Softworks Inc.
> 600 W. 28th St., Suite 103
> Austin, TX 78705
> 512-236-1677
> http://www.pinehill.com
>
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Received on Tue Feb 27 21:50:05 2001