TS-Optics 1.25" Solar Prism with complete equipment for professional solar observation

Herschel prisms are intended for observing the sun with refractors. Approximately 95% of the sunnlight are removed. The rest is available to the observer or photographer. The contrast is usually significantly better than with a lens filter.
This Solar prism from TS-Optics already comes completely equipped with extensive accessories. You don´t need additional filters or adapters for observing or photography.

The advantages of the TS-Optics 1.25" solar prism:

• Particularly high-quality surfaces for very high contrast
• Enclosed housing with integrated light trap - no escaping stray light
• Cooling fins for quick removal of the heat
• 1.25" narrow band interference filter, combined with an ND3.0 neutral density filter, for significantly enhancing the contrast of the solar surface. Especially faculae regions are shown better. The filter has a bandwidth of approximately 40 nm and its transmission peak at 540 nm. Now solar observation is possible with fast Fraunhofer refractors, as the chromatic aberration is removed.
• 1.25" polarising filter for screwing into an eyepiece for continuous adjustment of the brightness without without additional colouring.
• At the eyepiece side, 1.25" and T2 accessories can be attached.

Note: If you want to use the solar prism for photos or videos, black and white cameras have an advantage, as the narrow band filter only allows green light to pass through and therefore only half of the pixels contribute to image formation in color cameras. With black and white cameras, all pixels are used. However, you can also use an ND3.0 filter (see recommended accessories) instead of the narrow band filter, in which case color cameras can be used without any problems.

For which telescopes is the solar prism suitable:

The prism can be used on refractor telescopes without built-in corrector. Please make sure that the finder is covered or dismounted, otherwise the solar energy will melt the crosshairs and it is generally dangerous (risk of fire, risk of blindness if you accidentally look into it). However, a red dot finder does not need to be covered any more than a solar finder.

Cassegrain telescopes (including SC, Maksutovs, RC, EHD, ACF) can only be used with a suitable energy protection filter, because the secondary mirror is too close to the focal point of the primary mirror and heats up too much. The mirror could be damaged. The same applies to refractors with a built-in corrector (flat-field refractors) or tele objectives or Newtonian telescopes. Here, too, optical elements are too close to the focal plane and could be damaged. If you want to use these telescopes, a suitable energy protection filter must be placed in front of the optics to prevent the thermal energy of the sun from entering the telescope.

Please note: Herschel prisms therefore must not be used on Petzval systems or other telescopes that have glass in the optical path near the focal point. Multi-lens systems do not pose a problem as long as all optics are only at the front of the objective.

Warning!

Never use the Solar wedge visually without the supplied narrowband filter (possibly already inserted in the receptacle) and the polarizing filter. Otherwise irreparable eye damage can result!
For photographic use, however, you can use the CaK filter linked in the accessories section instead of the narrowband filter, together with an ND1.8 neutral density filter.

The narrowband filter can also be replaced visually and photographically with an ND3.0 neutral density filter if you don´t want the image to look green.

FEATURES

• Filter type:    White light solar filter
• Design:    Solar prism
• Suitable for:    Refractors without built-in field flattener
• Telescope side connection:    1.25" and M35x0.75 thread on the housing (female)
• Eyepiece side connection:    1.25", T2-thread (male) and M35x0.75 thread on the housing (female)
• Light path:    Approx. 75 mm
• Contrast enhancement:    Yes, the supplied ND3.0 filter is combined with a narrow-band green filter
• Brightness adjustment:    Via supplied polarization filter
• Weight:    Approx. 260 g