Antlia LRGBR+ Dark Filter Set - 2"

Antlia 2" LRGBR+ Dark Series Set

The Antlia LRGBR+ Dark Series Filters are designed with a full spectrum curve from 390nm to 1000nm, making it sensitive to both UV and IR light for high signal-to-noise ratio and contrast imaging in deep sky full-spectrum photography.

The LRGBR+ 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 cameras in the near-infrared bands, Antlia hAS incorporateD a Red+ 700-1000nm filter into the LRGB dark series to capture valuable signals that can not be detected by regular LRGB filters. 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 with regular LRGB filters.

The LRGB 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.

Important Note: When using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature.

Antlia LRGB Dark Series Set Highlights

• Full spectrum design enhances the sensitivity of imaging to both UV and IR light

• High transmittance B filter ≥95%, L-R-G filters ≥97%, ensuring 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 and minimize 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

• 2" mounted in ultra thin M48*0.75 filter cell

Technical Specifications:

• Transmission Range - Luminance (IV/IR): 390nm-710nm

• Transmission Range - Red: 595nm - 705nm

• Transmission Range - Green: 495nm - 600nm

• Transmission Range - Blue: 400nm - 505nm

• Transmission Range - Red+: 700nm - 1000nm

• Peak Transmission - L, R & G: 97%

• Peak Transmission - B & R+: 95%

• Filter Thickness: 2mm+/-0.05mm

• Substrate: Quartz glass except for R+, which is HWB

• Blocking: +/-OD4.5 (0.005%)

• Filter Size: 2" Mounted