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Fs: 2 Brass Pinhole Apertures $10
These are two nicely made pinholes. I measured them and as near as I can tell, one is .38mm and the other .40mm. I looked online and the ideal focal length for the .38mm is 72mm and for the .40mm is 81mm. I see that the metal is not completely flat, but assume it can be flattened.
$10 for the pair plus 2.00 for US postage, $5 for overseas.
Jon
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I would guess the slight bow to the brass is so it will spring when pushed into a holder slot.
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price drop to $6 for both, incl. shipping!
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Fs: 2 Brass Pinhole Apertures $10
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sold.
I believe these are somewhere around 100 years old.
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