Re: New site pinhole

Hi Katharine,

> Did someone just say that to get a seamless image with a circular
> camera, the focal length should be at least the radius of the inner
> circle? I thought I just saw that, and now I can't find it.

Chris Peregoy posted that information, paraphrasing Eric Renner's book.
I have the second edition of that book, and find the passage on pages
136-137:

  "A camera can be devised with six pinholes, each hole casting an image
   where sixty degrses is captured onto the cylinder. Each image
   fades proportionally into the one next to it, so that in the overall
   total image there is even exposure ... When six pinholes are used,
   each one capturing sixty-degress of image, a ratio can be given for
   structuring any size camera: focal distance equals the radius of the
   inner cylinder."

The camera being discussed is probably the one at

  http://geocities.yahoo.com.br/dimaues/camerasexpo06.htm

where the inner radius looks to be somewhat larger than half the total
radius.

Chris' message will appear in the archives tonight. Dirceu, do you
think you could post a link to the archives from your site? Naturally,
I am biased, but I feel they are a valuable resource to the community.

--Eric
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Received on Sun Dec 19 18:08:28 2004