The Lunt Herschel prism (1.25")is the safest and most excellent solution for studying sunspots and granulation. It gives a more detailed, sharp and contrasty image compared to various film or glass filters.
A special feature of the Lunt Herschel prism is that its prism is positioned at a special angle, called the Brewster angle, so that the Sun's light is already polarised, the intensity of which can be adjusted continuously with a special polarisation filter. It has a built-in ND3 filter, but a polarising filter or ND filter is required for further light reduction. An excellent alternative is the Baader Solar Continuum filter, which further enhances the contrast of the Sun's surface while reducing the disturbing effects of atmospheric turbulence.
The enclosed housing design ensures that light cannot escape in concentrated form, providing maximum safety during use.
The Lunt Herschel prism is recommended by the manufacturer for binoculars with a 102 mm or smaller lens. When using the Herschel prism, make sure that there are no other optical elements in the light path between the objective lens and the Herschel prism, e.g. (built-in) image plane corrector, other filters, as the heat concentrated by the objective lens may damage this optical element. It is also not recommended for observation with additional catadioptric telescopes (e.g. Makasutov-Cassegrain, Schmidt-Cassegrain, etc.). Newtonian telescopes do not give a sharp image due to lack of focus adjustment.
Without the aluminium case, the product weighs 235 g.
