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Astronomik H-Alpha 6 nm CCD Filter - 2" Round Mounted - HA6-2

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Astronomik 6 nm H-Alpha Filter - 2”

Designed to work with optical devices as fast as f/3.5, the Astronomik H-Alpha 6 nm Filter is an exceptionally narrow emission-line filter for CCD imaging applications only, not for visual or solar operations. This narrowband filter simultaneously lets h-alpha light from emission nebulae be transferred through to your sensor while completely obstructing the rest of the spectrum.

With a 6 nm full width at half maximum (FWHM), this filter is optimized to display maximum contrast between objects in the h-alpha spectral area, emission nebulae for example, and the skyglow background. While the 12 nm offers similar functionality, the 6 nm provides higher contrast gain because of its smaller FWHM. As a compromise, some background stars will be dimmed or completely eliminated from the final image. To avoid this, use both the 6 nm and 12 nm filters together to allow for maximum contrast without any reduction in your final image's background quality.

Since the Astronomik 6 nm H-Alpha CCD Filter offers total suppression of mercury (Hg) and sodium (Na) emissions lines, the primary light pollution offenders, it is an excellent option for imaging in light-polluted conditions.

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