APM - Herschelwedge / Solarprism 1.25 inch

erschelwedges/Solarprisms designed by APM Telescopes for high resolution photo-visuel work with refractors and shiefspieglers.

Warning: Never use the Herschelwedge in Catadioptric Telescopes like Schmidt Cassegrain or Maksutov Cassegrain. The heat entering
the front will damage your internal baffling and after time the mirrors coating.

Middle of last century Carl Zeiss sold such herschelwedges and since many years they are available in 2" size from Baader
Planetarium in Germany, used by scilled solarobservers. The Herschelwedges are beeing used like an normal Stardiagonal at the rear
of your telescope in the focuser. All 100% Solarlight enters this diagonal , than 95% of the energy goes out at the bottom side
which is protected at both sides with metalcovers that you don't burn your dress. 5" of the energy, still hot and strong enough to
damage your eyes , leaves the prism and is finaly blocked to 1:100,000 of the energy by an highest quality filterset from
BW-Schneider/Kreuznach in Germany. For general photo-visual uses we recomment the set of 1 pc ND3.0 and 1 pc Polarizing filter.
This filterset is screwed into your eyepiece barrel. By lossening the eyepiece holder clamp, you can rotate the eyepiece. Since
the filters are sitting on the bottom of the eyepiece holder, they rotate against each other automaticle which supplies the best
brightness. Many customers asked us about problems for the human eye by using Herschelwedges. In Germany we have strong medical
laws and Herschelwedges have been prooved to be trouble free for the human eye, if they are used as recommented. The bad
wavelenght are blocked enough to provide security for your eyes.