A useful article
Posted: Thu Oct 08, 2015 4:29 pm
Doing a bit of research and came across this article that has a number of useful formulas and descriptions of H alpha filters system configurations, as well as safety and exposure levels for UV and IR:
http://sunsteinlaw.com/media/sidorin_sunshine.pdf
Might be good to place in the Library...
http://sunsteinlaw.com/media/sidorin_sunshine.pdf
Might be good to place in the Library...