Description
The increase of the performance of our well-known h-alpha-filter with a full width at half maximum (FWHM) of 13nm offers a new FWHM of 6nm with more than 85% transmission. By the extremely small FWHM you achieve good results even under extreme light polluted skies. Under good skies, the filter can be used to lower the number and brightness of the stars in the photograph field and so to increase the contrast of hydrogen fog objects significantly. We measure the transmission of each filter individually and are able to offer you single filters with up to 95% transmission! You won’t find a filter with such transmission values for 6nm FWHM at our competitors! Each filter is supplied with individual measured values
