"Stephen McAvoy" <mcavoys[at]AOLdotCOM> wrote in message
news:hl7htv06vipgepipbtgmk4vg5ta2n344hp@4ax.com...

> Some camera obscura(s) were pinhole cameras others had a lens and a
mirror. The
> later were often rooms on top of a high outlook. (There is one in
Edinburgh
> which is open to the public)  It relies on the room to be quite dark, not
pitch

6d
> (about 25 euro cents)
>
Camera Obscura translates to "Dark Chamber".  Most were pinhole types, hole
in one outside wall projected an inverted image agains the back wall.  Most
interesting effect, no focal plane, everything was in as sharp focus as the
aperture of the pinhole would allow, the smaller the better.  Some modern
sun photography and other experiments are being done with variations of the
pinhole now.  With proper pinhole to film lengths it can give quite good
images, and there's no shortage of light.

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