Baader CoolCeramic Herschel Wedge Solar diagonal

Baader CoolCeramic Herschel Wedge Solar diagonal


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Model:  baader-herschel-wedge-2956500-V
Part Number:  2956500V
Brand:  Baader

The Baader 2" Herschel Safety Wedge Solar Prism provides high contrast detailed white light solar views. 

  • For use with refractor telescopes only.
  • Superior in resolution and contrast to the best glass objective filters around.
  • Provides a true white-light view, does not filter any visual wavelengths.
  • Uses precision 2" Zeiss wedge prism and incorporates a permanently pre-installed ND=3.0 filter in the wedge housing.
  • Waste energy is sent through Baader's innovative Light Trap.
  • Features Baader's 2" ClickLock eyepiece clamping mechanism.

This latest version incorporating an innovative Light Trap developed by Baader Planetarium brings the Herschel Wedge into the 21st Century, by rendering the output energy cool and diffused! In all other Herschel designs, the waste energy is simply deflected out of the rear face of the prism by an angled mirror. Though quite safe with careful use, the user still had to be aware not to place any object (or body part..) into this output beam (and to prevent any casual onlooker from carelessly staring up into the beam). Thanks to Baader Planetarium, this concern has now been completely removed. In place of the typical output mirror is a coated multi-layered perforated steel screen. The bright light and heat energy are harmlessly diffused. Even after prolonged observations through large refractors, the light trap remains cool. You can even place a hand below the output and no heat can be felt (also, no tempting hazardous bright light output for careless eyes to see).

Baader CoolCeramic Heat Cage!

The Solar light enters into the prism body and falls onto a 45° inclined prism surface. Approx 4.6% of Solar light is reflected into the eyepiece or camera respectively. The much larger percentage of light (95.4%) is fed into a separate “heat cage” which includes a special heat-absorbing ceramic tile. Like on a space shuttle the ceramic tile traps the radiant energy without overheating its surroundings. The body of the Baader Safety Herschel-Prism is closed on all sides which prevents any danger of contacting direct Sunlight, making it safe for educational work. Since the “heat cage” is separated from the prism body and connected only with four screws, there is virtually no heat distribution extended into the prism itself.

The translucent ceramic tile also acts as projection screen showing an unfocused image of the Sun so aiming the telescope at the Sun is now easier than ever before.

Baader offers two versions of their Herschel Wedge:

Visual V

The Version-V for visual use comes with a pre-installed ND=3.0 (required for safe viewing) filter and a 2" Continuum Filter.

Photographic P

The Version-P for photographic use is essentially the Version-V with three additional Baader ND filters (ND1.8, ND0.9 and ND0.6). The additional filters are handy for further dimming the image for white light viewing, or attaching to eyepieces or a T2-15 Reducer, and are particularly useful for imaging.

All of the fine-optically polished genuine Baader ND filters incorporate special anti-reflection multi-coatings to minimise light scatter and ghosting for maximum image contrast. The result is image quality unachievable with any other ND filter.

Baader Herschel Wedge Instructions and safety information.


1. The Baader Herschel Wedge must only be used with Refractor telescopes with metal and glass construction, not plastic. Telescopes with apertures 70-120mm work particularly well. Larger apertures can cause the rear heat trap to become uncomfortably hot.

2. Not suitable for use with Petzval or other telescope designs with a rear lens element positioned close to the focuser drawtube.

3. Due to production standards, the 2“ nosepiece in front of the Baader Safety Herschel-Prism features a 2“ (M48) filter thread. However - never mount a 2"“ filter in front of the Baader Herschel Wedge! Any filter mounted into the full beam of Solar energy so near to the focus point will become extremely hot and damaged within seconds (see safety advice, page 3 in manual). Filters must only be mounted above the exiting side of the prism.

4. Solar observing is dangerous and can be hazardous to eyesight. Safety is everyone’s responsibility, please use the correct equipment and read the safety notes supplied with the products carefully.


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