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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Shade safety on Davis 15
From: Ralf C. Kohlrausch
Date: 2026 Mar 27, 06:46 -0700
From: Ralf C. Kohlrausch
Date: 2026 Mar 27, 06:46 -0700
Hi,
You are not the first to complain about insufficient Davis-filters. Cassens & Plath uses welding glass made by Schott, owned by the Zeiss foundation. In the photographic world ND filters with a factor ranging from 100.000 to 1.000.000 (one million, one thousand times more than the one you have found) are used for sun photography. A sunfilter used for visual astronomy transmits about 0.001 percent of the light and reflects 99.999 percent including IR and UV. Easiest solution probably would be just to use the sunfilter goggles and wear them in the conventional way or stick one of them over the brightes of the Davis filters.
Or get a proper sextant ;-)
Greets
Ralf C.
