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Optolong Moon & Skyglow Light Pollution Reduction Filter - 2"

4.4 (5 Reviews) Read Reviews Write Review
Brand Optolong
Part Number Q1MU000404Y
Availability

Product Info

Manufacturer Description

A. About Optolong's Moon and Skyglow FIlter

Optolong's Moon & Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow (589nm) and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.

B. Main Uses and Performance

  • This is a versatile filter for visual observation and astrophotography of planetary nebulae.
  • Enhance contrast of moon, galaxies, nebulae and globular star clusters.

C. Spectral Curve Transmission Characteristics

  • Also blocks out infrared wavelengths (700-1100nm) so a separate IR cut-off filter is not required for imaging applications.

D. Technical Specifications

  • Both surfaces are fine optically polished, accurate to 1/4 wavelength or better, and parallel to within 30 seconds or arc.
  • 2mm thick Schott B270 optical glass substrate material.
  • Very high surface quality of 60/40 or better (US Military Spec MIL-O-13830).

E. Optical Coating Specifications

  • Multi layer anti-reflection coated.
  • Non-cementing optical substrate coating.
  • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) so that there is no deviation due to temperature changes during use.
  • Precise and homogeneous coatings ensure high values of desired passband and blocking of unwanted offband.
  • Every single filter is tested and passed by Optolong before shipping to dealers.

F. Other

  • 2" astronomy filter with standard M48x0.75 male filter thread (no female thread, so it cannot be stacked with other filters).
  • Ultra-thin filter cell to minimize vignetting; clear optical aperture of 26mm.
  • Precision CNC-machined metal filter cell with sand blasted black anodized finish, anti-reflection treatment, and laser engraving.
  • High quality protective plastic storage case.

WARNING: Optolong filters are not designed for direct solar observation. NEVER use these filters for observing the Sun, or permanent eye and equipment damage will result.

Reviews

4.4 (Based on 5 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by Laura25701
      1561809360
      Jun 29, 2019

      5.0 awesome

      Pros:

      Cons:

      Comments:

      From the moment we got it and looked out the window It was obvious how it would clear the haze and light pollution. It would be nice if they included a spectral graph. It does appear to be doing all the right frequencies.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

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      Review by Jim J.
      1560421254
      Jun 13, 2019

      5.0 Contrast improvement

      Pros:

      Cons:

      Comments:

      This filter is working well for me viewing with my Meade doublet refractor. The light polluted sky around bright objects is noticeably darkened using this. There is a slight purple glow on bright targets at times. Careful focusing seems to diminish the effect however.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    3. Guest

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      Review by chris m.
      1491694874
      Apr 8, 2017

      5.0 filter works well with deep

      Pros:

      Cons:

      Comments:

      filter works well with deep sky objects. Does cut glare on the moon.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      Review by Eduardo C.
      1489336366
      Mar 12, 2017

      4.0 Very Good

      Pros:

      Cons:

      Comments:

      Works very well. It is better than Barsta and similars brands but not good as Baader. Good choice for your money.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    5. Guest

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      Review by Scott M.
      1484577780
      Jan 16, 2017

      3.0 Optolong Moon & Skyglow Light Pollution Reduction Filter - 2"

      Pros:

      Cons:

      Comments:

      The filter works as advertised for skyglow and IR blocking.. However there is a raised ridge of chrome on the edge of the filter carrier housing that makes it slightly Larger than 2" and it is difficult to force the filter into a 2" adapter. If a tight adapter is used it will likely NOT fit into all holders and may therefore be unuseable. Lack of front threads to adapt for stackimng is already detailed.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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