Antlia LRGB V PRO 31mm, Unmounted *NEW PRO VERSION*

Highlight of the new LRGB-V Pro series set

• Improved contrast, star hypertrophy, and halo minimization compared with the previous Antlia LRGB V-series
• Premium coating technology and finely polished substrate Our quality selection processes are optimized to ensure highly homogeneous glass-substrates. Our application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters.
• Maximized colour balance and contrast for each of the three RGB channels and excellent S/N performance Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The Anti reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.
• Tighter star profiles and halo reduction The cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.

The Antlia LRGB V-series Pro filters are designed for monochrome cameras that use either CCD and CMOS sensors. Suitable sensors include KAF/KAI, Sony, GSENSE and other sensor manufacturers. This filter set is designed to approximately equalize the RGB response from monochrome sensors. The result is that you achieve 1:1:1 equalized RGB exposures with the benefit of simplified post processing and reduced dark frame library.

LRGB V-series filters highlight both the spectral gap design between green and red filters to minimize effect of light pollution and high transmittance of useful emission lines which means that it remains effective for weaker emission lines from galaxies and nebulae. The V-series filters guarantee the high transmission of the OIII band in both the B and G filters (OIII signal >95% in blue and green). The bandwidth of the B channel is narrowed for the purpose of effectively improving the blue overflow around the star due to B channel overexposure when RGB is synthesized.

The Antlia V-series filters block the emission line around 589nm, which suppresses much of the light pollution from high-pressure sodium and mercury street lamps and results in a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all of its narrowband filters.

Halo minimizations of Antlia LRGB V-series PRO  (Halo test on Sirius)

Upper Left to Right: Antlia V-series PRO L,R,G,B.
Lower Left to Right: Chroma L,R,G,B. 
Exposure: L (60s), RGB (180s each)

Applications and Performance:

• Designed for monochrome CCD and CMOS cameras
• Great imaging colors for celestial objects, galaxies, star clusters and nebulae
• AR anti-reflection film design for secondary reflection and star halo reduction
• R-Filter provides maximum transmission of H-alpha and S II emission
• B/G overlap doubles the energy in the OIII line
• Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems
• All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light
• Substrate thickness of each of the four LRGB filers is maintained to tight tolerances

Technical Specifications:

• Schott optical substrate
• Sizes: Mounted: 1.25" and 2" ; Unmounted: 31mm, 36mm, 50mm
• Thickness: 1.25”mounted, 2" mounted, 31mm unmounted, 36mm unmounted: 2mm+/-0.05mm
• Thickness: 50mm unmounted: 3mm+/-0.05mm
• Surface Quality: 60/40 (Refer to MIL-O-13830)
• 2 sides fine-optically polished to ensure accurate 1/4 wavefront
• 30 arcsec parallelism
• T_ave > 95%
• OD3 (0.1%) @ 300-1050nm
• Multi-layers anti-reflection coating
• Single Non-glued substrate

Filter Ring (Mounted versions only):

• 1.25’’ (M28.5*0.6), 2" (M48*0.75)
• Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
• Black Anodized Finish
• Laser Engraving, No Fading

Not Recommended:

• Solar Observing and imaging
• Visual observation
• DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.

Includes:

• Set includes 4 filters: Luminance (IR/UV-blocked colorless), Red, Green and Blue filters

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.