Optolong H-Beta Filter 1.25″

1.  Optolong H-Beta Introduction

Opotlong narrowband H-beta filter is designed for nebula observation allowing 12nm bandwidth of light centered on a wavelength of 486nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). H-beta emits 486nm and it is a blue–colored filte.

Main Use

Use with a large aperture telescope under clear and dark viewing conditions with good seeing.

Suitable for viewing on th