Antlia ALP-T Dual Band 5nm SII&Hb filter
Capture new deep-sky details with the Antlia ALP-T Dual Band 5nm SII&Hb filter. Designed for both color (OSC) and monochrome cameras, this filter allows Sulfur II (672.4nm) and Hydrogen Beta (486.1nm) emissions to pass through, enriching your images with unrivalled contrast and sharpness.
[Insert an image of the Antlia ALP-T Dual Band 5nm SII&Hb filter here].
Why choose the SII&Hb filter?
- Ultra-precise double band Simultaneous capture of SII and Hb lines to enrich image palettes.
- Tight belt width of 5nm to increase contrast and isolate fine structures.
- Delete OD4.5 to block light pollution, moonlight and atmospheric noise.
- Designed for color cameras (OSC) and can be used with monochrome sensors.
- Ion Gun Assisted Deposition coating for stable, long-lasting transmission.
- Rejection of NIR up to 1100nm for greater image purity.
Ideal applications
- False-color astrophotography (H-O-Hb, S-H-O, H-S-OHb, etc.)
- Working in bright, polluted urban skies (Bortle 5-8)
- Creation of enriched SHO images with 4 spectral channels (Ha, OIII, SII, Hb)
- The perfect complement to the Antlia ALP-T 5nm Ha&OIII filter
Technical specifications
| Parameter |
Sulfur-II (SII) |
Hydrogen-Beta (Hb) |
| FWHM |
5nm |
5nm |
| Center wavelength (CWL) |
672.4nm |
486.1nm |
| Maximum transmission |
90% |
85% |
| Out-of-band blocking |
≥OD4.5 (300nm to 1100nm) |
| Filter thickness |
2mm ± 0.05mm |
Available formats and indicative prices
- Mounted 2″ (M48x0.75): USD 350
- Ha&OIII + SII&Hb pack (2 filters): USD 690
- Other sizes: availability to be confirmed
Filter design
- Ultra-thin cell to reduce vignetting
- Durable black anodized finish
- Wear-resistant laser engraving
- Blackened edges to minimize internal reflections
Comparison and imaging strategy
- Combine ALP-T Ha&OIII and SII&Hb to obtain 4 channels (Ha/OIII/SII/Hb) that can be separated for treatment.
- Create images in various palettes (H-O-Hb, S-H-O, etc.).
- Significant signal enhancement compared to conventional RGB images.
Important notice
Never use this filter for direct solar observation. Serious eye damage may occur.
Additional resources
Discover Antlia's post-processing guide on YouTube : https://youtu.be/q9h-Ag7E-iY
