Explore Scientific 1.25" S-II Filter 12nm

The Explore Scientific S-II 1.25" 12nm filter is designed to facilitate the observation of emission nebulae, planetary nebulae and supernova remnants, even under a sky illuminated by light pollution. This narrowband filter blocks almost all artificial light and only allows the sulfur ionized emission line at 672 nm to pass through, revealing invisible details without a filter. It greatly improves the contrast of deep-sky objects, particularly for astrophotographers and urban observers. A must-have for any amateur astronomer, this filter guarantees quality results thanks to its individual test certificate.