APM Herschel prism with ceramic and 2" Fast-Lock Eyepiece Holder
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 function of the Herschel prism is based on the principle that only a small part (approx. 5%) of the incident light is used for the actual observation. The other part, which is incomparably larger and more energetic, is guided through the housing and forms a focal point outside the prism. Even far behind this focal point, the light concentration is still very intense, so that (with older prisms) caution had to be exercised, so that no inexperienced observer would accidentally look into the output light beam.
The APM Herschel prism is equipped with a ceramic light trap, an integrated multicoated ND3 filter and (removable) multicoated polarizing filter. The sun can be safely observed with the APM Herschel Prism.
Image brightness can be adjusted by rotating the 2" eyepieceholder with the polarizer installed. The Herschel Prism can be used both visually and photographically.
Clear optical aperture is 46mm
The use of the Herschel prism (in comparison with film filters) for sun observation is not only safer, but of better quality. The image has more contrast, more sharpness, and allows higher magnification.
Important note: The Herschel prism is only suitable for refractors and schiefspieglers (Tilted Component Reflector).
NOTE: DO NOT ATTEMPT TO USE ON REFRACTORS WITH REAR COMPRESSOR/CORRECTOR LENS GROUPS. This includes refractors like those made by Tele Vue
DO NOT ATTEMPT TO USE ON ANY CATADIOPTRIC (SCT, MAKSUTOV), CLASSICAL NEWTONIAN OR CASSEGRAINIAN TYPE TELESCOPES
The special features of APM Herschel:
- screwed on but also removable top-polarizing filter in the 2" plug-in sleeve
- Twisting of the 2" polarizing filter by a lever from the outside
- APM Fastlock eyepiece clamp
APM White Light Wedge Package Includes:
- APM 2" White Light Solar Wedge
- MC-coated Pre-Installed ND 3.0 Filter
- MC-coated Pre-Installed Polarizing filter
- Metal Carrying Case with Die Cut Foam with room for accessories