Optics

Optical filters have use in astrophotography

Feb. 14, 2023

Hydrogen-Alpha (H-Alpha) filters are used in astrophotography and exclude all light except for a small band at 656.3 nm.

Hydrogen-Alpha (H-Alpha) filters are used in astrophotography and exclude all light except for a small band at 656.3 nm, which is the wavelength emitted when a hydrogen atom’s single electron drops from its second to its first excited state. Circular filters for telescope mounting and square filters that attach directly to a camera are available.

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