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Great suppression of city light pollution.
Item worked for its intended purpose
Brand: Optolong
SKU : OL-CLS-1
Product Details
The Optolong CLS, is a City Light Suppression Broadband Telescope Filter.
Do you have artificial light pollution where you set your telescope? The CLS (City Light Suppression) filter is designed to enhance the contrast and improve the visibility for both photographic and visual applications in artificial light polluted areas. This CLS filter has a wider pass-band than the Ultra High Contrast (UHC) filters and is favored by many when observing in mild to moderate light pollution.
The CLS filter reduces the transmission of light pollution wavelengths. It specifically targets the wavelengths of high and low-pressure sodium vapor and mercury vapor lights.
If skyglow is a problem for you, using a CLS filter will also help reduce the skyglow caused by naturally occurring neutral oxygen emissions in our atmosphere.
Transmission Levels of CLS Filters
This 2-inch CLS filter is made with thick Schott glass which has been multi-coated with ion-assisted deposition technology. This ensures scratch resistance and stability on the central wavelength (CWL).
The filter mounting ring has been CNC machined from lightweight, strong metal, then sand-blasted, black anodized, and finally laser engraved to prevent fading. Resulting in a super thin 2-inch filter cell with a clear aperture of 45mm.
specifications
Bandpass | Multi Bandpass |
Filter Thickness | 2mm |
Filter Type | Light Pollution/City Light Suppression |
Free Shipping | Yes |
Shape | Round |
Size | 2" |
included items
Item worked for its intended purpose