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BST 2" Variable Transmission Polarizing Filter

4.9 (11 Reviews) Read Reviews Write Review
Brand BST
Part Number OFIL-BS-VPOL2
Availability available

Product Info

Manufacturer Description

While observing the moon or planets, there is often too much light that washes out subtle details. This glare can be cut back using neutral density filters or polarizers. The variable polarizing filter makes this even better by stacking two polarizing filters together and combining them with a special ring that prevents the two individual filters from getting separated during normal use. By rotating the two elements, light transmission can be varied between about 2% and 40%. This filter retains true color balance since all wavelengths are transmitted uniformly over the entire spectrum.

The two polarizing elements can be unscrewed to obtain two polarizing filters which can be used for day time photography or to improve contrast in images when only a little reduction in transmitted light is desired. The filter has a standard 2" thread (M48 x 0.75) so it can be screwed on to any virtually any standard 2" eyepiece or accessory.

Specifications:

  • Total item length (including external male thread) = 15.8mm (0.62")
  • Clear aperture = 44.8mm (1.76")
  • Weight = 0.9oz.
  • Protective plastic storage case: Included
  • Made in China

Reviews

4.9 (Based on 11 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      Review by James S.
      1548902766
      Jan 30, 2019

      5.0 BST 2” Pokarizing Filter

      Pros:

      Cons:

      Comments:

      I like that this filter can be disassembled into two segments and installed in front of my diagonal and the bottom of my eyepiece. Rotation of the eyepiece gives you the ability to optimize the polarizing effect on a bright target such as the full moon. I recently used this filter at a star party and it provided excellent high contrast views at comfortable and adjustable levels of brighteness.
      Excellent product performance!
      JAS in AZ

      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 Jeffrey W.
      1531091922
      Jul 8, 2018

      5.0 A must for viewing the moon

      Pros:

      Cons:

      Comments:

      This made viewing the moon a much more pleasant experience. The variable filter makes it convenient for both full and less-than full moon viewing. I am no longer nearly blinded after viewing, and they didn’t seeem to affect contrast.

      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 Neil P.
      1524955478
      Apr 28, 2018

      5.0 Powerful and Flexible Visual Tool

      Pros:

      Cons:

      Comments:

      I particularly like separating the two polarizing layers, and threading one in the diagonal and one in the 2" EP. This makes adjustment of the polarization as simple as rotating the EP. Particularly useful for lunar viewing.

      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 George B.
      1492022315
      Apr 12, 2017

      5.0 GCBOGS

      Pros:

      Cons:

      Comments:

      Quality Product, works great and arrived as schedule .

      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 John S.
      1490461474
      Mar 25, 2017

      5.0 BST 2" Variable Polarizing Filter

      Pros:

      Cons:

      Comments:

      Solid construction and works as designed. No complaints and recommended.

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

      This review was provided courtesy of AgenaAstro.com

    6. Guest

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      Review by Henry P.
      1487300131
      Feb 16, 2017

      5.0 Excellent Tool

      Pros:

      Cons:

      Comments:

      On the star shows I do on Mauna Kea in HI this is extremely useful in giving our guests the best possible view and optimum degree of filtering for whatever amount of lunar brightness we are dealing with. Variability without having to fumble with multiple filters.

      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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      Review by Oleksiy I.
      1484364208
      Jan 13, 2017

      5.0 This filter works as advertised

      Pros:

      Cons:

      Comments:

      This filter works as advertised - allows to adjust transmission ratio easily. No issues do far.

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

      This review was provided courtesy of AgenaAstro.com

    8. Guest

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      Review by sjv0mmv of West Palm Beach, FL.
      1348272000
      Sep 21, 2012

      5.0 Works as advertised

      Pros:

      Accurate,Quality Lenses,Easy to Use,Lightweight,Compact

      Cons:

      Comments:

      I've got this filter screwed to the bottom of the eyepiece. I don't think you could ask for a better functioning filter for looking at the moon. The way I'm using it, it's a little awkward to adjust the filtering effect as the filter is way up in the focuser. I have to remove the eyepiece to spin the filter to adjust it's effect then reinsert for another look. I'm new to astronomy so I guess this is how all filters are supposed to work...

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

      This review was provided courtesy of AgenaAstro.com

    9. Guest

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      Review by SHY of Suwanee, GA.
      1324944000
      Dec 26, 2011

      4.0 Exactly as advertised

      Pros:

      Strong Construction,Easy to Use,Quality Lenses

      Cons:

      Comments:

      This is a good, solid 2 inch polarizer. The unit separates into two ND filters.
      Construction is of good quality. I use it with larger lenses to view the moon with my 8 inch refractor. It does it's job satisfactorily.

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

      This review was provided courtesy of AgenaAstro.com

    10. Guest

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      Review by Andy of Calgary, AB.
      1320624000
      Nov 6, 2011

      5.0 The only polarizing lens you need!!!

      Pros:

      Easy to Use,Quality Lenses,Strong Construction

      Cons:

      Comments:

      A well thought out product design. Works as advertised. I like the fact I can control how much light to let through. Being a 2 piece filter, you don't need to screw both to your EP or diaganol, split them up and place one in each if you want. Another great product from Agena.

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

      This review was provided courtesy of AgenaAstro.com

    11. Guest

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      Review by peeech of North Augusta, SC.
      1319846400
      Oct 28, 2011

      5.0 Excellent Value!

      Pros:

      Quality Lenses,Easy to Use,Strong Construction

      Cons:

      Comments:

      I use this for both terrestrial and astro imaging. Good product for the money. Agena Astro provides excellent service, as well. That's why I order from them.

      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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      Specifications

      Manufacturer BST