ToupTek Astro LRGB Filter Set
Engineered to overcome light pollution, empowering astrophotographers to reveal the true colors of the universe
Engineered to overcome light pollution, ToupTek Astro LRGB filter sets empower astrophotographers to reveal the true colors of the universe.
RGB three-channel filters are essential tools for monochrome astronomical cameras to capture professional-grade images.
ToupTek Astro LRGB filters utilize advanced optical materials and precision coating technology to selectively transmit celestial radiation while blocking urban light pollution. This not only vividly reveals the authentic colors of the night sky but also significantly enhances image contrast.
Even faint celestial targets can display rich detail. Extremely low halo effects ensure every image maintains excellent fidelity, elevating your astrophotography to new heights.
Technical Parameters
Size Specifications
36mm (unmounted) / 1.25" (31.77mm) / 2"
Glass Thickness
2mm
Transmission
>95%
Glass Material
Quartz Glass
Frame Material
Aluminum Alloy Metal
OD Value
≥5.0
Transmission Ranges
L
420–690nm
R
595–695nm
G
495–580nm
B
400–510nm
Surface Treatment: Dual-side high-precision optical polishing
Coating Technology: IAD (Ion Assisted Deposition) coating technology
Coating System Design: AR anti-reflection coating + quartz glass + precision cut-off coating layer
Spectral Response Curves
Spectral Chart Reading Guide
-
Horizontal axis represents wavelength (unit: nm), vertical axis represents transmission (unit: %)
Gray line: L channel Red: R channel Green: G channel Blue: B channel
- Emission nebula signal bands are primarily concentrated at 656nm (Hα), 500.7nm (OIII), and similar wavelengths
- Light pollution peaks typically occur near 540nm and 590nm (sodium/mercury lamp bands)
- Astronomical filter transmission regions are carefully designed to avoid these interference bands, ensuring effective signal passage while enhancing contrast and image purity
Core Features
High-precision wavelength positioning enables RGB color reproduction closer to human vision, delivering more authentic target colors.
L Filter (420–690nm): UV/IR cut-off, enhances contrast and sharpness
R Filter (595–695nm): Emphasizes Hα and SII bands
G Filter (495–580nm): Suppresses mercury/sodium pollution while transmitting OIII
B Filter (400–510nm): Captures Hβ and OIII radiation
ToupTek filters utilize high-purity quartz glass substrate with transmission >90%. Features excellent blue-violet light transmission and thermal stability, ideal for demanding astronomical imaging applications.
Employs IAD (Ion Assisted Deposition) coating technology. While more expensive than traditional vacuum evaporation, it produces denser, more uniform coatings with superior durability, corrosion resistance, and environmental stability.
ToupTek filters employ proprietary multi-layer coating systems—including single-side cut-off, front surface AR coating, and edge blackening—to eliminate halos, minimize stray light, and ensure long-term durability.
All filters feature OD≥5.0 cut-off depth, blocking unwanted light, eliminating artifacts, and providing authentic color reproduction.
All filters feature matte black edge treatment, eliminating stray light and ensuring optimal transmission and contrast.
- 36mm filters: Feature recessed black ring facing telescope for instant orientation identification
- 1.25" and 2" filters: Equipped with threaded aluminum frames for direct screw-in installation
All filters feature monolithic, adhesive-free construction.
36mm: Suitable for APS-C and smaller sensor formats
1.25": Suitable for 1-inch and smaller sensor formats
2": Suitable for full-frame and smaller sensor formats
Compatible with industry-standard filter wheels:
36mm: 7-position / 1.25": 8-position / 2": 5-position
ToupTek Astro LRGB Filter Imaging Results
NGC1999
Photographer: voice
Camera: ToupTek ATR2600M
Guide Camera: GPM462M
Telescope: Sky-Watcher F3.4
Mount: UMI
Filters: ToupTek Astro 36mm LRGB&SHO
Exposure: RGB 12×600s each, L 600s×36, Hα 600s×48
Total exposure time: 20 hours
LBN777
Photographer: voice & LiiiiiCo
Camera: ToupTek ATR2600M
Guide Camera: GPM462M
Telescope: Sky-Watcher F3.4
Filters: ToupTek Astro 36mm LRGB&Hα
Mount: UMI
Exposure: RGB 20×600s each, L 600s×60, Hα 1200s×40
Total exposure time: 32 hours
LDN 1532 & IC 2087
Photographer: voice
Camera: ToupTek ATR2600M
Guide Camera: GPM462M
Telescope: Askar FRA400
Mount: UMI
Filters: ToupTek Astro 36mm LRGB&SHO
Exposure: RGB 15×600s each, L 600s×45, Hα 600s×66
Total exposure time: 26 hours
M81 & M82
Photographer: yahushua
Telescope: Askar 130HNT28-AL
Camera: ToupTek Astro ATR585M
Mount: iOptron CEM26
Guide Camera: G3M2210M
Filters: ToupTek Astro 1.25" LRGB & H-alpha
Total exposure time: 14 hours
M81 Individual Channel Single Exposure Examples (300 seconds)
L Channel
R Channel
G Channel
B Channel
Installation Guide
36mm Filters
Align the recessed black ring toward the telescope for instant positioning.
1.25" and 2" Filters
Screw directly into filter wheel—no need to distinguish front and back.
Warranty & Service
Quality Assurance Testing
Every filter undergoes spectral testing and rigorous screening before shipment to ensure optical performance consistency.
Warranty Policy
Two-year warranty covers manufacturing defects. ToupTek Astro provides professional technical support and usage guidance.
Technical Support
For assistance, please contact customer service or technical support through our support page:
ToupTek Astro Technical Support
Important Notes
Color Variations:
Filter coating colors may appear different under various lighting conditions and viewing angles—this is a normal optical phenomenon.
Product Improvements:
We continuously optimize our products, which may result in minor updates to specifications and appearance. Specifications subject to change without notice. Please refer to actual products.