----- Original Message -----
From: "Mark D Roberts" <mroberts@pb.seflin.org>
> I have tried repeatdly to order both zone plate and pinhole merchandise
> from the Pinhole Resources, but they never respond to my inquiries. Does
> anyone know if they are still active??
In the past I have sold pinhole apertures and zoneplates lenses.
Price: 3 @ $10.00 for pinholes for 25mm focal length or more.
Add $5 for each pinhole for focal length 15mm to 24mm.
Pinholes are custom made, you tell me the focal length and I give you the
optimum size for it using the formula:
Diameter in inches = 0.0073 SQRT(Focal length in inches)
I can provide you with zone plates also $15 each
Let me know if interested.
Guillermo
Received on Sun Apr 22 15:15:05 2001
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