NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: UNK
Date: 2013 Dec 19, 10:27 -0800
Thanks Alex,
My question would be what is the 130 mm which I see as the maximum distance where I get a sharp image looking through the objective lens? Can that reliably be treated as the focal length of that lens? If so, things fall into place.
Surplus Shed lists lens by type, diameter, and focal length. No diopters. The ID of the lens holder is 18.2 mm. They have a Plano Concave of 12.5 mm & -43 and other PCV’s and DCV’s that range from 15 to 17 mm and -33 to -39 f. No exact 18.2 & -43 but close enough.
Regards, Noell
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