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GSO 1.25" Polarizing Filter

4.9 (26 Reviews) Read Reviews Write Review
Brand GSO
Part Number AD086
Availability available

Product Info

Manufacturer Description

Like a pair of sunglasses, a polarizing filter reduces by a factor of two the amount of light passing through an eyepiece and into your eye. Reducing image brightness can help improve contrast in terrestrial viewing and imaging, especially in daytime photography. A polarizer also helps when viewing the Moon and planets by reducing brightness and glare to make it easier to see fine detail. It can also make it easier to split bright binary stars in dark sky by reducing glare and diffraction rings around the brighter star of the binary pair.

This GSO polarizer maintains true color balance by reducing the brightness of all colors of the optical spectrum. While the amount of light blocked by a single polarizer is fixed, this polarizer can be stacked with a second polarizer to create a rotatable variable polarizer for less money than a dedicated variable polarizer. Has a standard 1.25" male filter thread (M28.5x0.6) on one side and a female thread on the other side, so you can stack this filter with other 1.25" filters.

The filter comes in a protective plastic storage box. Made by GSO in Taiwan.

Reviews

4.9 (Based on 26 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      Review by Terence B.
      1533289418
      Aug 3, 2018

      5.0 two filters to rule the planets and moon

      Pros:

      Cons:

      Comments:

      I purchased two of these filters to use on the planets and the moon. One on the diagonal and one on the eyepiece allows fine tuning of the brightness levels. These are well made and the threads are smooth. A lot of visual impact for a little price.

      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 John L.
      1528073725
      Jun 3, 2018

      5.0 Single polarizer lens

      Pros:

      Cons:

      Comments:

      Works great with a Lunt right angle Hershel wedge.

      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 Erik S.
      1522729489
      Apr 2, 2018

      4.0 As expected

      Pros:

      Cons:

      Comments:

      Ordered two to make an adjustable moon filter. Added some PFTE thread tape to one set of threads to tighten up the fit. I'm quite happy with them.

      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 Paul B.
      1520449981
      Mar 7, 2018

      5.0 Good Stuff

      Pros:

      Cons:

      Comments:

      Good product, good service

      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 Doug J.
      1518529485
      Feb 13, 2018

      4.0 works good

      Pros:

      Cons:

      Comments:

      works good

      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 Carlos L.
      1512041634
      Nov 30, 2017

      5.0 Good filter

      Pros:

      Cons:

      Comments:

      It is a basic polarizing filter for a good price. If you want a variable filter you must buy another one to get the property.

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

      This review was provided courtesy of AgenaAstro.com

    7. Guest

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      Review by Arman F.
      1511574824
      Nov 24, 2017

      5.0 I love it

      Pros:

      Cons:

      Comments:

      I can control the light easily with them. You should get two filters. Excellent product!

      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 Randy W.
      1488466341
      Mar 2, 2017

      5.0 Great filter for observing nebulae.

      Pros:

      Cons:

      Comments:

      Great filter for observing nebulae.

      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 John W.
      1482585187
      Dec 24, 2016

      5.0 good price & works

      Pros:

      Cons:

      Comments:

      Not much to say, price is good and it polarizes light. Using for on a microscope, not astronomy, but I'm sure it will work there too.

      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 VagonSky of Monterrey, Mexico.
      1476057600
      Oct 9, 2016

      5.0 I would buy this product again

      Pros:

      Compact,Strong Construction,Lightweight,Quality Lenses,Accurate

      Cons:

      Comments:

      Only used it a couple of times, but it seems very good quality, so, for the price, it's a bargain.
      If you want to experiment a little bit with polarizer on the Moon or other objects, you will probably not find better choice of a cheap model.

      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 Buddy of New Bloomfield, MO.
      1475452800
      Oct 2, 2016

      4.0 Would buy again.

      Pros:

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

      Cons:

      Unstable

      Comments:

      It works very good, but is too easy to move out of set position when adjusting Lens. That's very bad when photographing the Sun! Found that a wide rubber band around it works great.

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

      This review was provided courtesy of AgenaAstro.com

    12. Guest

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      Review by Mic of Davis, CA.
      1444176000
      Oct 6, 2015

      5.0 Great value!

      Pros:

      Value,Quality

      Cons:

      Comments:

      I have several GSO filters that I use for solar viewing with a TV85 and Lunt wedge. They all work great and are a good value. I prefer the GSO polarizer over the Lumicon.

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

      This review was provided courtesy of AgenaAstro.com

    13. Guest

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      Review by AtomB of Phoenix, AZ.
      1427760000
      Mar 30, 2015

      5.0 Effective Solar Dimmer

      Pros:

      Cons:

      Comments:

      I use this to dim the brightness of the solar disk when viewed through a Herschel wedge. Since the light output from this prism is polarized, only a single polarizing filter is necessary. I find that this filter is more effective than using an ND filter.

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

      This review was provided courtesy of AgenaAstro.com

    14. Guest

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      Review by will the sky guy of Corning, New York.
      1427500800
      Mar 27, 2015

      5.0 Good product, great price

      Pros:

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

      Cons:

      Comments:

      So I needed a moon filter and read about these filters and decided to try it. Was a good choice good construction great glass.

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

      This review was provided courtesy of AgenaAstro.com

    15. Guest

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      Review by sarcosuchus imperator of Bryan OH.
      1424563200
      Feb 21, 2015

      5.0 Inexpensive and Well-Constructed

      Pros:

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

      Cons:

      Comments:

      You will not find a better example of low cost/high quality than this. If you own a binocular viewer, buy three of these and place one in front of the nosepiece of the bino-viewer and the other two in front of your eyepieces. Turn both of your eyepieces the same amount, and you have variable polarizarion while viewing through your bino-viewer.

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

      This review was provided courtesy of AgenaAstro.com

    16. Guest

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      Review by CathyK of Elizabethville, PA.
      1391904000
      Feb 8, 2014

      5.0 These are Great!

      Pros:

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

      Cons:

      Comments:

      I got two of the GSO Polarizing Filters to use for Star observing. I'm sure they will help in being able to separate Double Stars. I like the quality and price of GSO products.

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

      This review was provided courtesy of AgenaAstro.com

    17. Guest

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      Review by Talat of Turkey.
      1389052800
      Jan 6, 2014

      5.0 Eye saver for best price

      Pros:

      Easy to Use,Quality Lenses,Lightweight,Strong Construction

      Cons:

      Comments:

      I bought a pair of these for variable polarizing filter. Transmission is set by turning a filter with respect to the other. It works very well on moon which can be annoying after quarter. It is solid and well made.

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

      This review was provided courtesy of AgenaAstro.com

    18. Guest

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      Review by Merrill of Albany, LA.
      1380326400
      Sep 27, 2013

      5.0 A Fine Lunar Filter

      Pros:

      Strong Construction,Quality Lenses,Easy to Use,Lightweight

      Cons:

      None

      Comments:

      I've been stargazing for 40+ years. I've seen lots of filters, and this one is high quality at a very good price. It attenuates moonlight to 13% transmission, which is the most comfortable for most people. (I do a lot of public stargazing presentations.) It has clear high quality glass and an evenly distributed filtering. It does not affect focus. Good solid build, with a strong cell. Threads easily onto eyepieces. Could be used for astrophography to increase contrast, but exposure times must be compensate.

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

      This review was provided courtesy of AgenaAstro.com

    19. alanoodle

      alanoodle Member

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      Review by Alanoodle of Long Island, NY.
      1355270400
      Dec 11, 2012

      5.0 Great Value

      Pros:

      Easy to Use,Quality Lenses

      Cons:

      Comments:

      I purchased this to use as a variable Moon filter with another polarizing filter I already had. Great value. Does what it's supposed to do.

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

      This review was provided courtesy of AgenaAstro.com

    20. Guest

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      Review by PH of Passo de Torres, SC, Brazil.
      1341100800
      Jun 30, 2012

      5.0 Very good quality.

      Pros:

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

      Cons:

      Comments:

      It's a MUST have, when observing the Moon .
      I bought two of them as suggested. With one installed at the diagonal and the other at the eyepiece: it's easy to find the desirable brightness by just turning the eyepiece.

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

      This review was provided courtesy of AgenaAstro.com

    21. Ed D

      Ed D Well-Known Member

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      Review by Ed D of Miami, Florida.
      1341014400
      Jun 29, 2012

      5.0 Fantastic product at good price

      Pros:

      Strong Construction,Easy to Use,Quality Lenses

      Cons:

      None

      Comments:

      I bought this filter primarily to use in splitting double stars with a very bright primary. I tried it on Antares in Scorpius using my small refractor and mid-low magnification. With the filter attached to the eyepiece, I slowly began to rotate the eyepiece in the diagonal and could see the glare from the primary reducing and intensifying. With the glare reduced I could see the secondary star well, which I could not without the filter.

      This filter is very well constructed and I could not find anything to fault. The images are excellent and the glare reduction is subtle but very noticeable. I really like this filter and recommend it - great bang for the buck!

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

      This review was provided courtesy of AgenaAstro.com

    22. Guest

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      Review by evanapp of Kensington, CA.
      1320105600
      Oct 31, 2011

      5.0 Great for daytime moon viewing

      Pros:

      Easy to Use,Lightweight,Compact

      Cons:

      Comments:

      I use this with a 900mm ED refractor (900mm FL), typically on a 13mm Orion Stratus eyepiece. As you go from late afternoon to early evening, the filter darkens the background sky from blue-purple to nearly black, resulting in great detail 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

    23. Stalker

      Stalker New Member

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      Review by Alexandre of Rio de Janeiro. RJ.
      1272758400
      May 1, 2010

      5.0 Amazing filter

      Pros:

      Strong Construction,Quality Lenses,Compact,Accurate

      Cons:

      Comments:

      Amazing filter, I use two together like a variable.

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

      This review was provided courtesy of AgenaAstro.com

    24. Stalker

      Stalker New Member

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      1268255040
      Mar 10, 2010

      5.0 Well, its do the job.

      Pros:

      Quality Lenses, Strong Construction.

      Cons:

      None

      Comments:

      I purchased two of these to make a one variable filter. It works fine and cost 2/3 of a variable filter.

      I use for Moon watch, this filter block some luminosity. If you attach two filter on the eyepiece and rotate the last filter you make a variable filter. Can you block more or less luminosity when you turn 90° (1/4 lap). Perfect for watch full moon. Now I can watch for long time, before this filter I can't watch more than 30 seconds before hurt my eyes.

      For terrestrial use, one filter block the reflection on the water surface so it is possible take a picture of the fishes. Maybe reduce reflection in other surfaces.

      Note: Every observation have a full aperture. I have an 8" (200 mm ) reflector.

      Sorry my english, I'm brazilian.

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

      Stalker New Member

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      Review by Stalker of Rio de Janeiro. RJ.
      1267920000
      Mar 6, 2010

      5.0 Well, it does the job.

      Pros:

      Strong Construction,Quality Lenses

      Cons:

      Comments:

      I purchased two for make a one variable filter. Works fine and cost 2/3 of a variable filter. I use for Moon watch, this filter block some luminosity.

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

      This review was provided courtesy of AgenaAstro.com

    26. dkuchta5

      dkuchta5 New Member

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      Review by Hosebag of Rochester, NY.
      1258070400
      Nov 12, 2009

      5.0 Good quality, great price!

      Pros:

      Quality Lenses

      Cons:

      None

      Comments:

      Works as well as any polarizer but at a very good price. What's not to like?

      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 GSO