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CLS-CCD filter
Optolong CLS-CCD broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-b
  • Description

  • Specification

1.Optolong CLS-CCD Introduction

 

Optolong CLS-CCD broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for photograghic purpose at light pollution area.

Main Use and Performance

CLS-CCD is different from CLS with infrared wavelenth 700-1100nm cut-off. Fit with color CCD caemras and modified DSLRs for astrophotography.

Work well on most emission nebulae, planetary nebulae and supernova remnants.

Noticeable boost in constrast and visibility of the fainter outer detail. 

Light pollution filter do not eliminate the effects of light pollution or increase the object's brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

WARNING: The filter of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER DIRECTLY. You would be BLIND if you fail to observe the warning.

 

2. CLS-CCD Spectrum for Reference

 

How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

▲The RED line shows the transmission of the filter. The artifical emission lines are shown in ORANGE. And the emission lines from constellation are shown in GREEN.

 

 

3. CLS-CCD features

 

Specifications Applicable camera model Applicable lens Unit Price in US$
1.25" M28.5*0.5 / $96
2" M48*0.6 / $159
EOS-C clip

7D2/80D/800D/77D/70D/760D/750D/700D 650D/600D/550D/500D/400D/100D/

1100D 1200D/1300D

All EF lenses. But not suit for Canon EF-S lenses.

$115
EOS-FF clip 5D, 5D MarkII, 5D Mark III, and 6D. All EF lenses $135

 

 

Waring:

For camera clips, we only test the popular lens in market. For any other lens , feel free to contact our customer service staff. We would like to extend our sincere thanks for your support and test data.

 

4. Manufacturing Technology

⭐High-precision grinding and polishing to make sure the substrate parallelism is greater than 30" and the surface accuracy is better than λ/4 ;

⭐Purified water ultrosonic clearning is aim to effectively remove impurities and dust from the substrate surface.

⭐Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change; IAD not only consolidates membrane compactness, increases film firmness, but also changes vacuum coating material characteristics.

⭐Planetary rotation system offers precision and homegeneity of coating ensuring high value on transmission of pass-band and Optical density of off-band;

⭐Non-cementing optical substrate coating;

⭐Quality Control: each filters is examined by Spectrophotometer for spectrum characteristic, and Laser Interferometer for surface accuracy.

 

 

 

5. Package 

 

2019 NEW package

※Note:We are now in the transition from the old to the new packaging style, ship is random.

 

 

 

 

6. Optolong CLS-CCD Performance

 

I. NGC7000 & IC5070, shot by Weiguo 1688 with Optolong CLS-CCD filter.

 

 

 

 

Optolong CLS-CCD features 2 sizes:

★1.25"(1 1/4" mounted), 2" mounted for eyepiece

★SLR Camera clip filters