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Baader 2" Herschel prism for non-compromised solar observation. A new technology for light and heat absorption. Includes a 2" Solar Continuum filter. The Baader Herschel Wedge Prism is considered by many to be the finest on the market. This wedge uses a 2" Zeiss ultra smooth prism which maximizes contrast and sharpness. Baader incorporates many proprietary elements within their wedge, one of which is a specially enhanced optical design for stray light elimination.
A smart side effect of this Ceramic screen is the possibility of centering the sun in the telescope easily. Just place the Sun disk in the middle of the ceramic screen and you can start observing.
Both the Visual (V) and the Photo (P) versions contain the same Herschel prism. The difference lies in the different filter equipment. The Visual model includes the 2" Neutral Density ND 3.0 and 2" Solar Continuum Filter. The Photo version includes four 2" Neutral Density (ND 0.6, 0.9, 1.8, 3.0) and the 2" Solar Continuum Filter.
The Herschel Prism is intended for refractor telescopes without field flattener lenses on their rear side! The objective design (Doublet, Triplet, Air-Spaced, etc.) is not important. For all other kinds of telescopes we recommend a standard full-aperture type solar filter.
Adding this solar filter to your telescope will adequately filter the light coming through your focuser, but have you considered what you’ll do about your finder scope?
Here are some suggestions for dealing with your finder that will assure you do not damage your eyes (or anyone else’s) by looking at the Sun through your telescope’s unfiltered finder:
To make your optical finderscope safe for solar viewing you’ll need to buy a piece of Baader Solar Film for Visual Use. This film comes in different size sheets and cuts easily with scissors, allowing you to make your own filter. You can go super low-tech and use a rubber band to hold a piece of the film firmly around the finder or you can get fancy and build your own slip-on solar filter. However you attach the solar film, you need to make sure there are no light leaks at all and that it doesn’t accidentally fall off when you move your telescope around. Any unused film can store flat between two pieces of cardboard and will keep for years. It is nice to have around, just in case of a solar emergency :-)