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Optolong CLS 2″ Mounted Filter

$87.14 $43.57

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PRODUCT DESCRIPTION

The Optolong CLS (City Light Suppression) 2″ Mounted Filter is a broadband filter designed to enhance both visual observation and astrophotography under light-polluted skies. By selectively blocking wavelengths associated with artificial lightinglike sodium and mercury vapor emissionsit significantly improves contrast and clarity for celestial objects.

Ideal for deep-sky targets including nebulae and galaxies, this filter offers excellent transmission of key emission lines such as H-beta, OIII, H-alpha, and SII. It also helps suppress skyglow caused by naturally occurring oxygen emissions. Whether you’re imaging or observing, the Optolong CLS filter provides a cleaner view of the universe with high efficiency and precision.

TECHNICAL SPECIFICATIONS
  • Filter Type: CLS (City Light Suppression) Broadband
  • Size: 50.8mm (2″)
  • Filter Shape: Round
  • Insert Style: Threaded
  • Optical Thickness: 2.0 mm
  • Material: Schott B260 glass (Germany)
  • Surface Quality: 60/40 (MIL-O-13830)
  • Transmission Characteristics:
    • >95% at H-Beta 486nm
    • >95% at OIII 496nm / 500nm
    • >95% at H-alpha 65
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