Chroma H-Alpha Imaging Filter

Yes, this filter is designed to fit standard 2-inch filter wheels and drawers. It features an M48x0.75 thread specification, which is the industry standard for 2-inch astronomy accessories.

This filter is optimized for focal ratios of f/4 or slower. If you are using a very fast system, you may experience some signal loss or band-shift, so it is best suited for standard or slower focal ratios.

The 3nm bandwidth is significantly narrower than standard 7nm or 12nm filters, which allows for much higher contrast by isolating the H-Alpha emission line more precisely. This makes it exceptionally effective at suppressing light pollution and enhancing the detail of nebulae in challenging conditions.

No, the filter is engineered with specialized anti-reflection coatings specifically to prevent ghosting. Combined with the high-quality single-substrate glass, it delivers clean, sharp images without the artifacts often seen in lower-quality filters.

The filter is designed for spectral stability. Thanks to its sputtered hard coatings and single-substrate construction, the passband remains stable even when temperatures fluctuate, ensuring consistent results throughout the night.