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Astronomik H-Alpha 6 nm CCD Filter - 1.25" Round Mounted - HA6-1

SKU: ASF-HA6-1

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Astronomik 6 nm H-Alpha Filter - 1.25”




An extremely narrow emission-line filter, the Astronomik 6 nm H-alpha filter is for CCD imaging work and not for visual or solar applications. It is designed for use with instruments as fast as f/3.5. This narrowband filter allows the h-alpha light from emission nebulae pass through to your sensor while blocking other areas of the spectrum almost completely.



The FWHM of the Astronomik 6nm H-Alpha 1.25” Filter is optimized for maximum contrast between objects that emit H-alpha, such as emission nebulae, and the background sky. While the 12nm is similar in function, the 6nm offers higher contrast gain due to the smaller FWHM. The trade-off is the dimming or eradication of some background stars in the final image. Using the Astronomik 6nm H-Alpha in conjunction with the 12nm H-Alpha filter will provide maximum contrast in HII objects (6nm) while keeping background stars visible (12nm) in the final image.



The Astronomik 6nm H-Alpha filter is a good choice for imaging from light-polluted skies, as it completely suppresses mercury (Hg) and sodium (Na) emissions lines; the main culprits of light pollution.



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

Description
Description

Astronomik 6 nm H-Alpha Filter - 1.25”


An extremely narrow emission-line filter, the Astronomik 6 nm H-alpha filter is for CCD imaging work and not for visual or solar applications. It is designed for use with instruments as fast as f/3.5. This narrowband filter allows the h-alpha light from emission nebulae pass through to your sensor while blocking other areas of the spectrum almost completely.

The FWHM of the Astronomik 6nm H-Alpha 1.25” Filter is optimized for maximum contrast between objects that emit H-alpha, such as emission nebulae, and the background sky. While the 12nm is similar in function, the 6nm offers higher contrast gain due to the smaller FWHM. The trade-off is the dimming or eradication of some background stars in the final image. Using the Astronomik 6nm H-Alpha in conjunction with the 12nm H-Alpha filter will provide maximum contrast in HII objects (6nm) while keeping background stars visible (12nm) in the final image.

The Astronomik 6nm H-Alpha filter is a good choice for imaging from light-polluted skies, as it completely suppresses mercury (Hg) and sodium (Na) emissions lines; the main culprits of light pollution.

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

Specifications
Specifications
Model Number HA6-1
Single Filter, Set, or Accessory Single Filter
Filter Type H-Alpha
Filter Bandpass 6 nm
Filter Size 31.75 mm (1.25")
Filter Shape Round
Filter Optical Thickness 1 mm
Filter Insert Style Threaded
Warranty Ten (10) Years
What's in the Box?
What's in the Box?
  • Astronomik H-Alpha 6 nm CCD Filter - 1.25" Round Mounted

  • Plastic Storage Case
  • Astronomik 6 nm H-Alpha Filter in 1.25" Format
  • Astronomik H-Alpha 6 nm CCD Filter Transmission
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