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Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
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30 Day Return Policy
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Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
Product Description
The Antlia LRGBR+ Dark series filters are designed with a fullspectrum curve from 390nm to 1000nm, making it sensitive toboth UV and IR light for high signal-to-noise ratio and contrast imaging in deep sky full-spectrum photography. The LRGB dark series filters are made of quartz glass, which has exceptional thermal and mechanical properties due to its ultra-low thermal expansion coefficient. These filters offer remarkable durability for imaging and research in the most challenging environmental conditions.
Considering the high quantum efficiency (QE) of the cameras in the near-infrared bands, Antlia incorporates a Red+ 700-1000nm filter into the LRGB Dark series to capture valuable signals that cannot be detected by regular LRGB filters. Note that this filter set does NOT include the Red+ Filter.
In post-processing, combine the R and R+ channels to create a new R channel. The remaining steps for processing are identical to those used as regular LRGB filters.
The LRGBR+ Dark series filters are best paired with Antlia SHO 2.8nm and 2.5nm Ultra Narrowband filters, as they share the same quartz substrate and refractive index, resulting in better parfocality.
Main Features
- Full spectrum design enhances the sensitivity of imaging to both UV and IR light
- High transmittance B filter ≥95%，L-R-G filter ≥97%，this ensures that there is almost no loss in image signal, maximizing contrast
- Made of quartz glass, excellent durability and thermal stability, as well as better fracture and scratch resistance,improved coating resilience to cleaning
- More infrared signal to be found by combining Red+ filter
- Out of band blocking specification is designed to OD4.5 (0.005%) to block interference from other wavelengths andminimize halos around bright stars
- Identical filter thickness to existing standards and double-sided fine polishing, with utmost care for parfocality
- All Antlia filters are coated to the edge of the substrate and unmounted sizes are edge blackened to eliminate internal reflections from stray light
- Filters are resistant to scratches
- Warranty: 3-years against delamination
Specifications
| Model | Luminance UV/IR Cut | Red | Green | Blue | Red+ |
| Transmission Range | 390nm-710nm | 595-705nm | 495-600nm | 400-505nm | 700-1000nm |
| Peak Transmission | 97% | 97% | 97% | 95% | 95% |
| Substrate | Quartz Glass | Quartz Glass | Quartz Glass | Quartz Glass | HWB |
| Blocking | ≥OD4.5 @ 300-1100nm | ≥OD4.5 @ 300-1100nm | ≥OD4.5 @ 300-1100nm | ≥OD4.5 @ 300-1100nm | ≥OD4.5 @ 300-1100nm |
| Filter Thickness | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm |
