The Antlia 8-EL UHC Pro Visual Enhancer filter is a high--performance optical filter designed for visual observation of celestial objects.
This filter is designed to combat moderate light pollution while maintaining excellent color balance, making it ideal for visual observation of emission nebulae, planetary nebulae, and other objects. It selectively enhances key emission lines through its high-transmission design, including:
95% Peak transmission at 671.6nm (SII)
95% Peak transmission at 673.1nm (SII)
95% Peak transmission at 486.1nm (H-beta)
95% Peak transmission at 495.9nm (OIII)
95% Peak transmission at 500.7nm (OIII)
95% Peak transmission at 654.8nm (NII)
95% Peak transmission at 658.3nm (NII)
95% Peak transmission at 656.3nm (H-alpha)
95% Peak transmission at 671.6nm (SII)
95% Peak transmission at 673.1nm (SII)
The combination of high transmission (>95%) and sodium-light suppression allows observers to perceive fine structural details in Planetary nebula, emission nebula targets, even under moderate light pollution.
1. Visual Recommendations
1) Large-Aperture Telescopes: Due to reduced photon capture by the human eye at night，we recommend using large-aperture telescopes (e.g., 8-inch or larger) to ensure sufficient light throughput. This compensates for the inherent sensitivity drop in low-light conditions while maintaining the filter’s balance between light pollution suppression and target brightness.
2) Visual Enhanced Contrast in Nebulae:
8-EL（8 emission lines) and target recommendations
Emission lines | Suggested observation targets |
486.1nm (H-beta) | M42 Orion Nebula,NGC 7000 North America Nebula,M16 Eagle Nebula, M8 Lagoon Nebula |
495.9nm (OIII) | -Recommended Nebulae: M57 Ring Nebula,NGC6960 Veil Nebula,NGC6543 Cat's Eye Nebula,NGC6302 Butterfly Nebula |
500.7nm (OIII) | M42 Orion Nebula, M57 Ring Nebula, NGC 6992 Veil Nebula on the east side, IC 2177 Seagull Nebula, M104 Broad-shouldered Cap Galaxy |
654.8nm (NII) | NGC 6960 Veil Nebula, M1 Crab Nebula, M57 Ring Nebula, NGC 6543 Cat's Eye Nebula |
658.3nm (NII) | M42 Orion Nebula, NGC 6960 Veil Nebula, M57 Ring Nebula |
656.3nm (H-alpha) | M42 Orion Nebula, IC434 Horsehead Nebula, NGC7000 North America Nebula, M16 Eagle Nebula, M8 Lagoon Nebula, NGC6960 Veil Nebula |
671.6nm (SII) | M42 Orion Nebula, IC434 Horsehead Nebula, M1 Crab Nebula, M16 Eagle Nebula, M57 Ring Nebula, NGC6543 Cat's Eye Nebula |
673.1nm (SII) | M42 Orion Nebula, M1 Cassiopeia Nebula, NGC 6960 Veil Nebula, IC 443 Jellyfish Nebula, M27 Sundial Nebula |
Spectrum Curve:
Warranty: 3-years against delamination
Size Available:
Mounted 2''
Filter Ring:
2'' (M48*0.75)
Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
Black Anodized Finish
Laser Engraving No Fading
Not Recommended:
Solar imaging
Not Permitted:
DO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY
Serious eye damage will result if you fail to observe the warning.