Optolong H-Alpha 7nm Imaging Filter - 1.25" - HA-7-125 Lunt Ha Solar Filters and it filled the void

and it filled the void for a lack of high-quality

The Antares 2MD-D: 2" Mirror Diagonal with pressure band retainer has a multilayer dielectric coating with 99% reflectivity in green (546 nM) light

5kg)(Optional) Operation temperature -20ºC ~ 40ºC (hand controller -10ºC ~ 40ºC) Warranty Two year limited * 200mm

9° angular field of view (FOV)

solar and lunar)

Optolong H-Alpha 7nm Imaging Filter - 1.25" - HA-7-125 Lunt Ha Solar Filters and it filled the voidThe Optolong H Alpha 7nm Narrowband Imaging Filter is the popular filter allowing 7nm bandwidth of light centered on a wavelength of 656nm 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). Better choice of