H-alpha 3nm Bandpass optimized for f/2.8-f/3.6

$362.25 ~~$575~~ In stock

Description

H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm). Chroma’s f/3.0 filters are designed to minimize spectral shift and hold their shape better in an f/3.0 beam.

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Customer Reviews (4.4 / 5 · 5 reviews)

Ella Y. ★★★★★ Oct 21, 2026

Installed this in my imaging train last night and the difference in contrast on the Horsehead was immediate. The 3nm bandpass really blocks out the light pollution I've been fighting.

John X. ★★★★★ Oct 20, 2026

Pairing this with my f/3.0 scope finally brought out the Veil Nebula's faint tendrils that other filters couldn't resolve. The 3nm bandwidth is incredibly selective, cutting through urban skyglow without losing any of the critical H-alpha signal.

Eva U. ★★★★★ Oct 19, 2026

Used it on my EdgeHD 11 at f/7 and the contrast on the Veil Nebula was incredible, even with a full moon nearby. The 3nm bandpass cuts through light pollution better than my old 5nm filter ever did.