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Multi-Narrowband Filter SV240
1.The multilayer coating design for the remarkable performance in tacking light pollution and high transmittance in core wavelength. 2.Near IR (NIR) is blocked up to 1100nm. 3.The strong ability to tacking light pollution up to BORTLE 8 allows .
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Hao P.
Reviewed in the United States on February 26, 2025
Amazing filter, it effectively blocks light pollution while preserving better image details. I was wondering how a single filter can allow certain wavelengths while blocking others. Here’s what I found: it uses multiple dielectric layers, each precisely designed to manipulate light through optical interference. When light reaches these layers:Desired wavelengths experience constructive interference, where reflected waves align in phase, reinforcing them and allowing them to pass through.Unwanted wavelengths experience destructive interference, where reflections from different layers cancel each other out, preventing them from passing through.
Ralph Van Eck
Reviewed in the United States on February 23, 2025
I live in an area with a lot of light pollution - I can barely see magnitude 2 stars - but this filter substantially increases the contrast in my photographs and makes a gray sky dark. I use it when imaging galaxies and nebula, not planets which are bright enough on their own. As you can see in the attached photos, the resulting images are clear and contrasty, with no distortion. Dim stars are pinpoints and bright ones are simple, clean dots, with no evidence of halos under any circumstances.
GVPA1
Reviewed in the United States on January 20, 2025
Used in Bortle 8 skies and very pleased with the Astrophoto shots.
Kay
Reviewed in the United States on October 24, 2024
It blocks at the expected bands. If it used to image Jupiter or Saturn, they look bluish and dark reddish. This means that yellow-orange is blocked, which is the primary component of light pollution.
brian
Reviewed in the United States on October 14, 2024
This filter creates large halos. It’s not just the one halo around the star but 4 additional halos in a cross pattern. Tried many different exposure times but I get the same results. The image is a screen shoot from a single sub from the ASIAiar app. These get magnified as the images get stacked. Would not recommend.
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