Antlia H-Alpha Filters

Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia H-alpha 3nm Pro filters are designed to deliver 88% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.

• Basic Substrate: Schott optical substrate
• Filter Thickness:   2mm+/-0.05mm for Dia31mm
• FWHM (Full width at half maximum): 3nm
• CWL (Central Wavelength): 656.3nmnm
• Peak Transmission: ?88%
• Blocking: > 5 OD(0.001% out of band blocking) @ 300-1000nm
• Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
• Transmitted Wavefront: Lambda/4 or better.
• Parallelism: less than 30 arcsec
• Single / Non-glued substrate

Antlia 3 nm H-Alpha ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 1.25" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 656.3 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box

Antlia 3 nm H-Alpha ultra - narrow band filter for astrophotography - images with extreme contrast even with strong light pollution

• 2" mounted with low-profile filter cell
• Suitable for telescopes and lenses with a focal ratio of f/3 and lower
• Schott optical base substrate
• Blackened edges to avoid internal reflections
• Extremely narrow bandwidth of only 3 nm for maximum contrast
• Central wavelength 656.3 nm
• Filter thickness 2 mm
• Comes in convenient plastic transport box