Lonnie,
I'm trying to finish my Bender 4x5 for World Pinhole Day. It has two focal
lengths: 65 or 87 mm. They recommend pinholes of 0.33 mm for the 65 mm for
an f# = 197 and 0.38 mm for the 87 mm for an f# = 229. You mentioned 0.018"
(0.457 mm) as the best for a "normal" 4x5. My questions are:
1. What focal length are you talking about?
2. Where on earth do you get a 0.018" drill bit for a Dremel (hobby drill)?
John McAdam
Received on Tue Apr 3 23:54:52 2001
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