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 Technology H-alpha filters are available in the following filter sizes:
- 1.25″ Mounted
- 2″ Mounted
- 31mm Unmounted
- 36mm Unmounted
- 50mm Unmounted
- 50x50mm Square Unmounted
Optical Density Data:
All transmission and blocking (OD) data are actual, measured spectra of representative production lots. Spectra varies slightly from lot to lot. Optical density values in excess of 6 may appear noisy because such evaluations push the resolution limit of low light level measurements.
