About this product
Model: antlia_lrgb-v-pro_125
Part Number: LRGB-V Pro Series 1.25
Antlia LRGB-V Pro Astronomy Filters
The Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. Suitable sensors include KAF/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The LRGB-V Pro set is designed to approximately equalise the RGB response from the flux of red-sensitive CCD detectors. The result is that you achieve 1:1:1 equalised RGB exposures with the benefit of simplified post processing and reduced imaging time. New LRGB-V Pro series filters feature a carefully designed spectral gap between the green and red channels to minimise the effect of light pollution and to provide high transmittance of useful frequencies. The filters’ design maximises the capture of details from fainter galaxies and nebulae emissions. The LRGB-V Pro 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 improving the blue channel overflow (haloing) around the star due to B channel overexposure. Antlia LRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R filters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results in a more natural colour balance. The uniformity in substrate thickness delivers good parfocal performance across all Antlia filters.
Highlight of LRGB-V Pro series set
1. Premium coating technology and finely polished substrate Our quality selection processes are optimised 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.
2. Maximised 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 minimise unwanted light scatter and maximise useful signal data for each filter channel.
3. Tighter star profiles and halo reduction The cut-off rate of LRGB-V Pro series set is designed in high level to minimise halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.
IMPORTANT: These filters are NOT designed for observing or photographing the Sun. DO NOT use these filters to observe or photograph the Sun. If you do it will result in permanent eye damage!
FEATURES
- Designed for monochrome CCD and CMOS cameras
- Great imaging colours 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
- Edge blackened to eliminate internal reflections from stray light
- 2mm+/-0.05mm thickness for 1.25", 2" mounted, 31mm and 36mm unmounted
- 3mm+/-0.05mm thickness for 50mm and 50x50mm unmounted
- Fine-optically polished on both sides
- Not recommended for Solar observing and imaging
- Not recommended for visual observation
Parfocal Filters
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 stabilised nearer to ambient temperature.
Transmission Chart
The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)
The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)
Specifications
Basic Substrate: optical substrate
Filter Thickness:
2mm+/-0.05mm for 1.25", 2" mounted, 31mm and 36mm unmounted
3mm+/-0.05mm for 50mm and 50x50mm unmounted
Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
Transmitted Wavefront: Lambda/4 or better.
Parallelism: less than 30 arcsec
Single / Non-glued substrate
Filter Ring:
1.25’’(M28.5*0.6) or 2’’(M48*0.75)
Ultra-thin filter cell to minimise vignetting
Black anodised finish Laser engraving
No fading
Customer reviews
| Average Rating (2 Reviews): | |
26 February 2023 | Joakim
Compared to cheaper 1.25 LRGB filters, this is a step up - not only in price but also quality and value. These filters are actually parfocal, which may save you time in focusing during imaging runs. I can absolutely reccomend them.
Halo free, fantastic colour rendition, tight stars 01 February 2023 | Ben
The description Antlia give these filters is very accurate. I previously used an Astronomik luminance (L2) filter which was very good, but I wanted to move to a full LRGB setup that could go in a filter wheel. These 36mm filters fit perfectly, as expected, in the ZWO EFW 36mm V2. I thought I would quickly mention that if you plan on buying unmounted filters, spend a good amount of time to ensure you have them orientated the right way around. The luminance filter is pretty tricky to tell, even with the instructions from Antlia and on forums you can doubt yourself. It’s much easier to do it once and seal the filter wheel than having to open it again.
The Red, Green and Blue filters all produce great signal and tight stars. Notably, the blue stars on my setup (A Skywatcher 200P, slightly modified) are still really tight and match the same sort of HFR values as the Red and Green, which is really important for colour accuracy and saves a lot of time in the processing workflow. This is even more important if you’re using a refractor. These filters aren’t *quite* par focal, but very close. I refocus between filter changes anyway and if you’re using NINA, then you can just put in filter offsets and it’s a non issue.
The colour rendition is oh so nice. Due to the overlap of the bands of the blue and green filter, you get a very nice range of teal to deeper blue colours - whereas I found on OSC especially, the range of those isn’t as obvious mostly rendering blues as a generic blue. The reds are very deep and strong, but not overpowering and lead to a really lovely colour rendition of brown dust and dark nebula. I find myself doing very minimal colour work with these filters as straight out the box / stack they’re fantastic. The luminance packs a LOT of punch and once again, halo free. They all easily calibrate with flats.
Finally, I chose these over staying with Astronomik due to also partnering these with their 3nm Pro Ha filter. Antlia recently are known for their price to performance and with their newer coatings, these are a really solid choice. You can’t go too wrong with broadband / LRGB filters, but it’s still reassuring to have a setup that works.
FWIW, I shoot from low Bortle 4 skies - SQM 21.5.
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