Antlia 8-EL UHC Pro Visual Enhancer Filter - 2" Mounted
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Antlia 8-EL UHC Pro Visual Enhanced Filter Introduction
The Antlia 8-EL UHC Pro Visual Enhanced 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 nebulae and emission nebulae targets, even under moderate light pollution.
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 |
Warranty: 3-years against delamination
Size Available: 2’’ mounted
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.
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 50.3 mm / 2.0 in
T = Total Filter Height = 7.3 mm / 0.28 in
C = Filter Cell Height (Excluding Male Thread) = 4.9 mm / 0.19 in
M = Male Thread Length = 2.5 mm / 0.09 in
F = USABLE Female Filter Thread Length = Not threaded, so you cannot stack additional filters
S = Glass Substrate Thickness = 2 mm / 0.07 in
CA = Clear Aperture = 45 mm / 1.77 in
Other Information
- Country of Manufacture: China
Antlia 8-EL UHC Pro Visual Enhanced Filter Introduction
The Antlia 8-EL UHC Pro Visual Enhanced 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 nebulae and emission nebulae targets, even under moderate light pollution.
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 |
Warranty: 3-years against delamination
Size Available: 2’’ mounted
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.
Antlia 8-EL UHC Pro Visual Enhanced Filter Introduction
The Antlia 8-EL UHC Pro Visual Enhanced 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 nebulae and emission nebulae targets, even under moderate light pollution.
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 |
Warranty: 3-years against delamination
Size Available: 2’’ mounted
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.
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 50.3 mm / 2.0 in
T = Total Filter Height = 7.3 mm / 0.28 in
C = Filter Cell Height (Excluding Male Thread) = 4.9 mm / 0.19 in
M = Male Thread Length = 2.5 mm / 0.09 in
F = USABLE Female Filter Thread Length = Not threaded, so you cannot stack additional filters
S = Glass Substrate Thickness = 2 mm / 0.07 in
CA = Clear Aperture = 45 mm / 1.77 in
Other Information
- Country of Manufacture: China
Antlia 8-EL UHC Pro Visual Enhancer Filter - 2" Mounted