Optolong CLS Filter - Nikon D7000/D7100 Clip - NIKD7-CLS Item no longer available

Description

Optolong CLS Clip Filter for Nikon D7000 or D7100 Cameras

This City Light Suppression filter, or CLS filter, by Optolong, has been optimized for Nikon D7000 or D7100 cameras. The filter is great not only for visual observations but for photographic applications as well.  The CLS filter is excellent for when you're observing in an area with artificial light pollution. Because the CLS filter has a larger pass-band than a UHC filter, many amateur astronomers favor the CLS filter when observing in mild to moderate light pollution. The CLS filter selectively blocks transmission of wavelengths known for light pollution, especially artificial light pollution from high and low-pressure sodium vapor and mercury vapor lights. Using a CLS filter will even help reduce skyglow caused by naturally occurring neutral oxygen emissions in our atmosphere.

The Optolong CLS Nikon Clip Filter is made Schott glass that has been multi-coated with ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved.

 

Transmission Characteristics of CLS Filter

• 95% transmission H-Beta 486nm

• 95% transmission OIII 496nm and 500nm

• 95% transmission H-Alpha 656nm

• 95% transmission SII 672nm

• 0.1% transmission Hg at 435nm and 578nm

• 0.1% transmission Na at 589nm

 

Quality Filter Materials:

• Schott B260 substrate material from Germany, 1.0mm thick

• CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading

• Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition

 

Optolong Filter Manufacturing Processes and Parameters

• Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces

• Surface quality, according to MIL-O-13830, is 60/40

• Main nebula emission lines has a transmission of 95%

• Off-band (major emission lines of artificial light pollution) transmission is 0.1%

• High-value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogeneous and precise coating procedure

• Each filter comes with a plastic case with high-pressure EVA case lining

 

About Optolong

Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design, and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.

 

Supplier SKU

NIKD7-CLS

What's Included

• Optolong CLS Filter in Nikon D7000/D7100 Clip Format

• Filter Case