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4 × DC power cables (2 × 1m
Glass thickness 2
Inexpensive entry into the world of Deepsky Astro imaging
so as to reach the wall without serial number
Optolong H-beta Filters 25nm wide field refractor 4 × DC power cablesThis premium Optolong Narrowband H beta filter is designed for nebula observation allowing 25nm bandwidth of light centered on a wavelength of appr 490nm throughout, about halfway between the H beta emission line and OIII. It also reduces 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
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