Herschelwedges/Solarprisms designed by APM Telescopes for high resolution photo-visual work with refractors and shiefspieglers.
Warning: Never use the Herschelwedge in Catadioptric Telescopes like Schmidt Cassegrain or Maksutov Cassegrain
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 solar observers. The Herschelwedges are being used like an normal Star diagonal 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 metal covers 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 filter set from BW-Schneider/Kreuznach in Germany. For general photo-visual uses we recommend the set of 1 pc ND3.0 and 1 pc Polarizing filter. This filter set is screwed into your eyepiece barrel. By loosening 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 automatically 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 Herschel wedges have been proved to be trouble free for the human eye, if they are used as recommended. The bad wavelength are blocked enough to provide security for your eyes.
|Name||APM - Herschelwedge / Solarprism 1.25 "|
|Manufacturer||Amateur Prazisionsoptik Mechanik (APM)|