ANTLIA LRGB Dark Series Astronomy Imaging Filters - 36mm

ANTLIA LRGB Dark Series QUARTZ Astronomy Imaging Filters - UnMounted 36mm Glass Only (without filter cell)

We offer this version in case you are not yet ready or don't have the equipment for full spectrum imaging. You will be able to add the R+ filter later, when needed (to be purchased separately). 

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 the cameras in the near-infrared bands, Antlia incorporates a Red+700-1000nm filter into LRGB dark series to capture valuable signals that cannot 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 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.

Specifications:

Available Sizes: 

Main features and applications:

- 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 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 narrowband filters are edge blackened to eliminate internal reflections from stray light；
- Filters are resistant to scratches；
- Warranty: 3-years against delamination.

Filter Ring:

Antlia standard thread:1.25’’ (M28.5*0.6)，2’’(M48*0.75 pitch)
Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
Black Anodized Finish
Laser Engraving No Fading

Not Recommended:

Solar imaging
Night visual observation

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER
Serious eye damage will result if you fail to observe the warning.

Spectrum Graph: