Herschel Wedges or as they are sometimes known Solar Wedges are used to observe the sun with refractor telescopes in white light. More than 95% of the Sun's light will be suppressed by the Herschel Wedge and the remaining 5% is further dimmed by a pre-installed Neutral Density 3.0 filter. An additional radial polarizing filter (supplied separately) can be installed in an eyepiece to reduce the light yet further to a desired level. A Herschel Wedge polarises light, so in order to tune the brightness using a polarising filter, you simply twist an eyepiece with a radal polarising filter installed. As the eyepiece twists in the Herschel wedge's eyepiece holder, polarisation either increases or decreases - and you can set this to your own personal needs. We recommend the Bresser Polarising Filter 1.25" for this purpose ref 4946464
The difference between Herschel Wedges and normal front mounted filters is, that the filtering takes place just before the eyepiece or camera. This will provide a better contrast and sharpness of the solar image.
Advantages of the Herschel Wedge:
Especially high-quality optical surfaces for very good contrast
Fully closed body with integrated heat trap
No stray light escaping - so it is very safe
ND3.0 filter comes pre-installed
This Herschel Wedge is only for use with refractor telescopes up to 150mm aperture. Because the full energy and heat of the sun inside the telescope OTA, we advise to only use refractor with a Herschel Wedge. The refractors must also not have corrector lenses at the rear of the OTA. Optical elements like corrector lenses or secondary mirrors of reflector telescopes become very hot by the concentrated solar energy and could be damaged - thus SCTs and Maksutovs are classed as unsuitable.
Excellent Solar Viewing Wedge Really pleased with the wedge. Really good high contrast white light views of the Sun. Good seeing conditions allow for higher magnification for greater sunspot detail. Used in conjuction with a Baader Single Polarising Filter (bought seperately) allows comfortable viewing. Highly recommended. (04/07/2017) Steve Viney - Stockport
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