Antlia 2" Quad Band Anti Light Pollution Narrow Band Filter

Designed to suppress light pollution for color and monochrome cameras, this filter provides more balanced RGB colors.

♦ suitable for recording galaxies, reflection nebulae and star clusters, not just emission nebulae

♦ Transmits NIR to get more signal from certain full spectrum objects such as various galaxies without detecting too much light pollution

♦ specially developed for balanced color transfer

♦ only minimal color cast for broadband emission objects such as stars, galaxies and globular clusters

♦ Can be used with almost all systems with an aperture of f/2

♦ Luminance filter replacement for imaging continuum-emitting objects with monochrome cameras



 
Antlia Quad-Band Anti-Light Pollution Narrow Band Filter - 2" Fitting

The Antlia Quad Band Anti-Light Pollution Filter is a stray light suppression filter for color and monochrome cameras. It is capable of capturing most deep sky objects such as galaxies, reflection nebulae, emission nebulae and star clusters under a sky ranging from Bortle 8 to Bortle 1, as its spectral transmittance covers the visible light range, the near ultraviolet (NUV) and the near infrared (NIR) range includes.

The Antlia quad-band filter has a wide bandpass designed for faster optics up to f/2 aperture ratio.

Given the high quantum efficiency (QE) of the latest cameras in the near-infrared region and the fact that this region is less susceptible to artificial light pollution, the Antlia Quad Band Light-Pollution Filter offers high transmission in the near-infrared (NIR) region. This transmission range design improves the signal-to-noise ratio and contrast of the image by capturing light in the visible and NIR ranges, while maintaining good color balance and facilitating post-processing.

Certain full-spectrum objects such as M51 and M83 have a significant near-infrared (NIR) signal. With the Antlia Quad Band filter, you may be able to capture these deep sky objects under light-polluted skies with more contrast.

When using this filter with a camera that has a UV/IR protective glass, the emission in the visible range is preserved, but the IR blocking limits the ability to capture objects with infrared emission.

Therefore, the Antlia Quad Band Filter is more suitable for cameras with AR protective glass as they can capture both NIR and visible signals.

Key Features and Application:

♦ Anti-light pollution - the Antlia quad-band filter is an effective solution for reducing light pollution as it blocks out most of the 589nm orange-yellow light and some of the blue light from LEDs.
♦ Over 95% of deep sky objects can be captured.
♦ Unique spectral structure provides more possibilities for astrophotography
♦ The high transmission of the most important emission lines Hα/[S II]/[O III]/Hβ in the visible range improves the high SNR and contrast of the astrophotography.
♦ Transmittance for the near infrared range (NIR) - in contrast to the Optolong L-QUAD2
♦ The near infrared transmission is intended for capturing deep sky objects that cannot be captured well with other filters without NIR transmission.
♦ The wide bandpass is designed to be compatible with faster optics up to f/2.
♦ The IDAS GNB-M48 offers slightly narrower passbands, but significantly less transmission for H-beta and [S II] and none around 400 nm.
♦ Good color balance
♦ Adding short wavelength transmission makes it easier to achieve even color balance.
♦ Superior optical durability reduces image post-processing
♦ Base substrate: Optical, plain / non-glued substrate
♦ Surface quality: S/D (scratch/dig)= 60/40 (see MIL-O-13830)
♦ Transmitted wavefront: Lambda/4 or better.
♦ Parallelism: less than 30 arcseconds
♦ Warranty: 3 years against delamination

Maximum transmission H-alpha: >92% (at 656.3 nm)
Maximum transmittance [S II]: >92% (at 671.6 nm and 672.4 nm)
Maximum transmission [O III]: >92% (at 495.9 nm and 500.7 nm)
Maximum transmission H-beta: >92% (at 486.1 nm)
Maximum transmission [N II]: >92% (at 658.3 nm and 654.8 nm)
Blocking: ≥OD4 at 300-1050 nm
Aperture ratio: Up to f/2
Filter thickness: 2mm +/-0.05mm
Frame: aluminum, black anodized, laser engraved


♦ Filters
♦ Protective box