The H Alpha Filter

Solarscope's H-Alpha filters can be fitted to telescopes as shown on this Tele Vue telescope.

If you already have a small refractor you may prefer to add a Hydrogen Alpha filter to it. This is now possible with Solarscope's range of solar filters.

The filter system comes in 2 parts: the front narrow band filter (below right) and the rear blocking filter (below left). The front filter contains an energy rejection filter (he first red coloured filter at the front of the system), which blocks out the dangerous ultraviolet and infra red radiation, and some of the visible spectrum. After that comes the etalon, which filters the light further, blocking all but the very narrow bandwidth (0.7Å) on the H alpha line. Finally, the rear blocking filter attenuates the brightness and ensures only the H alpha line is seen at the eyepiece.



Solarscope Hydrogen Alpha filters were originally conceived to work with the Tele Vue range of telescopes, but this has now been developed further to allow their use with a wide variety of smaller refracting telescopes by the addition of custom made adaptor rings. Please contact us to discuss the suitability of your telescope.

This picture was taken by Jack Newton using a double stack 50mm filter.

Solar Filter Specifications
Full Aperture	50mm	60mm	70mm
Operating Wavelength	656.28nm ( H-alpha )
Etalon Coating	Ultra Hard multi-layer dielectric reflector
Anti Reflector Coating	Ultra Hard multi-layer dielectric AR
Single Filter Bandwidth	0.7Å Bandwidth with fine-tune tilt
Double Filter Bandwidth	0.5Å Bandwidth with dual fine-tune tilt
Thermal Stability	< 1Å / 200°C
Adaptor Plate	To suit your telescope
Single Filter Price	£2645.00	£3395.00	£4275.00
Double Filter Price	£4700.00	£5795.00	£7595.00
Prices include VAT but exclude cost of the adaptor plate