Filtre H-Beta 25nm 1.25" - SVBONY autopostr_instagram_68716 the filter substrate is polished

the filter substrate is polished to 1/4 wave and <30 parallelism on both surfaces

Dimensions : 397 mm Quel modèle est inclus dans les éléments livrés

42mm or 45mm

les systèmes audio professionnels et tout dispositif acceptant une entrée microphone standard

and instrument recording

Filtre H-Beta 25nm 1.25" - SVBONY autopostr_instagram_68716 the filter substrate is polishedSV132 H Beta 25nm 1. 25 inch filter to reduce light pollution Designed for observing the Horsehead, California, and Cocoon nebulae with a moderate to large aperture telescope in dark skies. High precision optical polishing on both sides; the filter substrate is polished to 1 4 wave and <30 parallelism on both surfaces, preventing halos. High precision optical coatings improve transmission and cutoff depth; they offer over 90% transmission and