APM Ceramic Safety 2" Herschelprism with APM Fast-Lock Eyepiece Adapter.For solar white light imaging and white light visual observing. The APM White Light Wedge comes with a built in ND3 filter which allows perfectly safe imaging or visual observing of the Sun. The APM Herschel prism is equipped with the ceramic light trap, an multicoated integrated multicoated ND3 filter and (removable) multicoated polarizing filter. The sun can be safely observed with the APM Herschel Prism.The image brightness can be adjusted by twisting of the 2 "polarizing filter by rotating the 2" eyepieceholder from outside . Thus, the Herschel Prism can be used both visually and also photographically same good!
The combination of materials results in an unusually high image quality for this price and makes the lens a real all-rounder for visual and astrophotographic applications.
Focal ratio 1:7
Aperture 180mm
Focal length 1260mm
FCD100 Triplet Optics
Temperature compensated cell allows collimation of the lens via three side screws.
Good as a basis for the do-it-yourself construction of a high-quality refractor