Re: 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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> >
>
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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