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Astronomik H-Alpha 6 nm CCD Filter - 36 mm Round

(Only 1 Left)
Free shipping
SKU: ASF-HA6-36
$279.95

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Astronomik 6 nm H-Alpha Filter - 36 mm

An extremely narrow emission-line filter, the Astronomik 6 nm H-Alpha Filter is best equipped for CCD imaging with instruments as fast as f/3.5. It is not suitable for visual or solar applications. This filter allows h-alpha light from emission nebulae to pass through to your sensor while obstructing the remainder of the spectrum entirely.

With a 6 nm full width at half maximum (FWHM), this Astronomik H-Alpha CCD Filter is enhanced for presenting maximum contrast between objects that emit h-alpha light (emission nebulae for example) and the background sky. Although the 12 nm offers similar performance, the smaller FWHM of the 6 nm allows for higher contrast gain. The downside of this is evident in the final image where some background stars are dimmed or can't be seen at all. To combat this, simply use the 6 nm and 12 nm filters simultaneously to allow for maximum contrast without any compromise in your final image's background quality.

Given that the Astronomik 6 nm H-Alpha CCD Filter completely suppresses the main offenders of light pollution, mercury (Hg) and sodium (Na) emissions lines, it makes for an excellent filter for use in a light-polluted environment.

Please note this filter must NEVER be used for solar observing or imaging. Doing so will cause permanent damage to your eyes.