Astronomik Filters H-alpha 12nm 50mm (62750)

The H-alpha filter transmits light at a wavelength of 656 nm, making it an excellent choice for narrowband H-alpha astrophotography. It delivers high-contrast images and reveals rich nebular details, even in areas with strong light pollution.

These 50 mm filters are compatible with all 50 mm filter wheels from ZWO, QHY, QSI, Starlight Xpress, SBIG, Moravian, and Atik. The filter design includes a protective ring and blackened edges to prevent stray light, provide mechanical protection, and make handling easier. The orientation of the filter in the wheel does not affect its optical performance.

Narrowband line filters are especially useful for astrophotography under bright skies. An H-alpha filter is often the first recommended purchase, allowing detailed images even during full moon or in bright sky conditions. It is perfect for imaging all nebulae that emit red light. For more imaging options, adding an OIII filter captures green and blue structures in planetary nebulae and star-forming regions, while an SII filter completes the HSO set for creating color images similar to those from the Hubble Space Telescope.

When choosing the filter’s half-width, 12 nm filters are recommended for DSLRs and cameras with limited dark current, as they make it easier to find tracking stars and offer excellent results under darker skies. For cameras with very low dark current and strong cooling, 6 nm filters provide maximum sky suppression, allowing for longer exposures and higher contrast, especially useful in regions dense with stars.

In summary, use 12 nm filters for DSLRs and cameras with higher dark current, and 6 nm filters for locations with heavy light pollution or for deep imaging with advanced cooled cameras.

Specifications

• Central wavelength: 656 nm

• Half-value width: 12 nm

• Frame: Ring

• Filter size: 50 mm

• Transmission: 96%

• Mount material: Aluminium

• Optical coating: Multiple coatings

• Type: Filter

• Build: Line filter

• Series: H-alpha 12nm

Area of Application

• Useful for photographs: Yes

• Visually useful: Yes

• Twin stars: No

• Moon & Planets: No

• Nebulae & galaxies: Yes