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Tony,

Here are archive posts on the Bris. 

http://www.fer3.com/arc/sort2.aspx?subj=bris&author=&y=200001&y2=201912

Lots of reading.

When I get a chance I'll post images of the DIY I made using microscope slides and camera polarizers/filters. The practical Suns used are the #5 to #8 reflections which are dim and very easy on the eye with the #8 reflection at about 40° hs. 

Greg Rudzinski

From: Tony Oz
Date: 2016 Sep 21, 02:24 -0700

I'm experimenting with few bits of glass to build a DIY "Bris".

This article describes a tool with a set of reflections at 13°, 22°, 26°, 35°, 44°, 48°, 57° and 70°. Is this set optimal for real-life observations? If not - what agnle values should I aim for in my design?

I hope to use it (or - most probably - a pair of "Bris"s) somewhere between equator and 60°.

The other question: what size of the device is most comfortable?

Right now my pieces of glass are 25mm·15mm - similar to author's article. I tried them on a sunny day - it was painfull to use (despite the 9 DIN welding filter was used) because 15mm-narrow "bris" does not cover the eyeball enough. The bright light from the right and left part of the sky still blinds me. When I did my initial tests with the uncut filter (110mm·150mm) there was no such problem. I'd like to avoid using any rubber eyecups...

Please share your experience.

Regards,

Tony