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Optolong UV / IR Cut Filter - 36mm Round Unmounted

5.0 (6 Reviews) Read Reviews Write Review
Brand Optolong
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Product Info

Manufacturer Description

A. About Optolong's UV-IR Cut FIlter

Optolong's UV-IR cut filter is designed to block ultraviolet and infrared wavelengths to improve sharpness of the image as most of the optics are designed for the visible spectrum, because it's very difficult to create a lens with the same focal point for the visible and IR spectrum. It is used on a digital camera and the video, which do not have an IR protection filter toward an image sensor or were remodeled. This is important because unfiltered CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum that can have a very negative impact on image quality.

B. Main Uses and Performance

  • Suitable for color CMOS and CCD cameras and modified DSLRs.
  • Use with monochrome CCD for astrophotography.

C. Spectral Curve Transmission Characteristics

  • 95% transmission at visible spectral region 420-680nm highly passing the major nebula emission lines of H-Alpha 656nm, SII 672nm and NII 654nm and 658nm.
  • Ultraviolet 300-400nm and infrared wavelength 700-1100nm cut-off.
  • 0.1% transmission of ff-band wavelengths.

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

  • Unmounted 36mm round filter for use in imaging filter wheels
  • 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

5.0 (Based on 6 Reviews) 100% of reviewers recommended this product.
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    1. Scopejunkie

      Scopejunkie Well-Known Member

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      User Notes:
      Review by Keith L.
      1560731167
      Jun 16, 2019

      5.0 Good Filter

      Pros:

      Cons:

      Comments:

      Product as described.

      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 Eddgie
      1558102480
      May 17, 2019

      5.0 UV/IR Cut Filter

      Pros:

      Cons:

      Comments:

      Bought this to use as energy rejection filter for a Quark Solar Filter when used in my 120ED. Nice quality and very good value. I do not have a means of testing the cutoff, but it seems to have worked fine for this application.

      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 Gary Q.
      1556046844
      Apr 23, 2019

      5.0 2in UV/IR Cut Filter

      Pros:

      Cons:

      Comments:

      Makes viewing with the Hyperstar a lot better.
      Agena Astro makes life easier by explaining in detail what each product accomplishes.

      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 Evan M.
      1528868673
      Jun 12, 2018

      5.0 Yup its a filter

      Pros:

      Cons:

      Comments:

      Works as promised

      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 Gary S.
      1524641204
      Apr 25, 2018

      5.0 I would recommend this product

      Pros:

      Cons:

      Comments:

      I would recommend this product to a friend.

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

      This review was provided courtesy of AgenaAstro.com

    6. Ed D

      Ed D Well-Known Member

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      User Notes:
      Review by Ed M.
      1502297204
      Aug 9, 2017

      5.0 Great filter, threads were a bit large

      Pros:

      Cons:

      Comments:

      This is an excellent IR/UV cut filter. I use this filter on one of my cameras that only has a clear protective window. The images of solar system objects remain sharp and well defined, the filter doing what it's supposed to do. My only negative is that the threads on my sample were a bit large, the filter not fitting on the nose of one camera, but fit fine in my other camera, as well as my diagolas, etc, that I tried it in. All of my other filters, including my Baader Neodymium with UV/IR cut, fit the particular camera fine.

      I really wish I could give it a 4.5 or 4.7 stars because of the threads. But, it's a very good filter at a great price, so I rounded up to 5 stars. All of the reviews I read about Optolong filters were very positive, and I agree.

      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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