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GSO 1.25" IR Block Filter

4.5 (12 Reviews) Read Reviews Write Review
Brand GSO
Part Number AD071
Availability available

Product Info

Manufacturer Description

An infrared filter (also called an IR Block filter) is a very important accessory for imaging with today's CCDs, digitial cameras or webcams. Imaging sensors in these cameras are sensitive to visible light as well as to infrared wavelengths. As a result, images of stars might be bloated and lunar and planetary images will be soft.

GSO's IR Blocking filter is recommended for use with CCD, video & webcams for sharper images. It threads on to any CCD camera, eyepiece, or adapter that accepts 1.25" filters. Such filters are required when imaging with refractor telescopes. Compound reflectors (like Schmidt-Cassegrain and Maksutov-Cassegrain telescopes) will also benefit from an IR-block filter to some extent. Even imaging through Newtonian telescopes will benefit since IR filters will reduce "IR bleed". As an added advantage, use of this filter also acts as a dust cover for the sensitive CCD chip in imaging devices.

This filter has an extremely sharp cutoff at 690nm, yet it transmits all the visible red wavelengths (including the important 656nm H-alpha emission line) and prevents IR wavelengths from blurring fine detail in your digital images. GSO does not provide a transmission curve for its filter but we had one tested at the physics lab of a local college. The tested unit had peak visible light transmission of over 95%. GSO does not claim that this filter also blocks out UV wavelengths.

The filter cell is beautifully machined and black-anodized with threads on both sides (male on one side and female on the other), so you can stack this filter with other 1.25" filters. Its clear aperture is a full 26mm. The filter glass is scratch resistant and the filter can be used with a telescope of any f-ratio. The glass substrate is of very high optical quality, so it can be used in front of a lens without degrading the image quality. In fact, the GSO filter is a more expensive coated "dichroic" filter that displays a pinkish reflecting tint, as opposed to cheaper "absorbing glass" IR block filters which exhibit a greenish tint.

The GSO IR Blocking filter ships in a protective, foam-lined, plastic storage case.

Specifications:

Total item length (including external male thread) = 11.1mm (0.44")
Clear aperture = 26mm (1.02")
Weight = 0.2 oz.
Made in Taiwan

Reviews

4.5 (Based on 12 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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

      5.0 A much needed addition to my filer sets

      Pros:

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

      Cons:

      Comments:

      I got this filer because I am going to try my hand at Astrophotography. I wanted a very good quality filter and I know that GSO would be the one to get.
      This filter may also be a UV filter which is great!
      I have read that many times a IR filter is also a UV filter. This should help me take great photos of the objects I want to photograph.

      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 Jay of Mobile, AL.
      1380412800
      Sep 28, 2013

      5.0 Excellent Quality and Service

      Pros:

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

      Cons:

      Comments:

      These IR filters screwed onto a webcam adapter nose piece. The threads matched perfectly. The IR filters are high quality products. The modified webcams will be used in my astronomical observing this fall and winter.

      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 Derek of Texas.
      1330128000
      Feb 24, 2012

      4.0 For photography, one form or another

      Pros:

      Easy to Use,Lightweight,Compact,Quality Lenses

      Cons:

      Comments:

      I used this to cut down the IR saturation due to unwanted (in my case) IR sensitivity in the camera I adapted for use with a telescope.

      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 tony8gj of Bellevue, WA.
      1324080000
      Dec 16, 2011

      4.0 Good quality filter

      Pros:

      Easy to Use

      Cons:

      Comments:

      I use this filter for planetary imaging and as protection over my imager's CCD chip. It is good value and I am happy with my resulting images.

      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 Astro Mike of New Middletown, OH.
      1320192000
      Nov 1, 2011

      5.0 Excellent value

      Pros:

      Easy to Use,Quality Lenses,Strong Construction,Performance

      Cons:

      None

      Comments:

      I use this exclusively in photographing the planets. This filter very effectively reduces infrared blooming of the planets and the moon, allowing for much clearer, more detailed views. I am very happy with the performance, and this unit is priced far below any other similar filter. I believe you cannot do any better at any price.

      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 tbverse of Bellevue, WA.
      1307145600
      Jun 3, 2011

      4.0 Good value, great quality.

      Pros:

      Strong Construction

      Cons:

      Comments:

      I use this with my Meade DSI II mono for astrophotography and it works great. Plus, the price can't be beat.

      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 pablopox2008 of Buenos Aires Argentina.
      1292803200
      Dec 19, 2010

      5.0 I would buy this product again and again

      Pros:

      Accurate,Strong Construction,Quality Lenses,Compact

      Cons:

      Comments:

      Highly recommended, excellent product and good price

      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 JCB of Apopka, Florida.
      1272672000
      Apr 30, 2010

      5.0 This is an excellent product!!!

      Pros:

      Strong Construction,Quality Lenses

      Cons:

      Comments:

      Agena scores again!

      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 asttro1 of Lewisburg, TN.
      1243468800
      May 27, 2009

      5.0 IR Blocking filter

      Pros:

      Quality Lenses

      Cons:

      Comments:

      The GSO 1.25" IR Blocker has served me well. I purchased this filter for a modified webcam after removing the manufactures internal IR filter, with it on or off my photos are just what I expected. I must say I feel it would stack up against some of the other major brands

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

      This review was provided courtesy of AgenaAstro.com

    10. jonm

      jonm New Member

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      Review by JonM of Fort Myers, Florida.
      1243468800
      May 27, 2009

      4.0 A Good Choice

      Pros:

      Cons:

      Comments:

      This filter seemed to work as well as another, more expensive brand when compared side to side at a local star party. Mine just cost less.

      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 nMAC of Portugal.
      1243468800
      May 27, 2009

      4.0 Quality affordable filter

      Pros:

      Strong Construction,Compact,Quality Lenses,Accurate

      Cons:

      Greenish image

      Comments:

      I use the item for planetary fotos for filtering the IR.
      Light and Compact, Well constructed.
      It outputs a greenish/bluish image that has to be corrected in the blue channel.

      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 JA of FT LAUDERDALE FL.
      1243382400
      May 26, 2009

      4.0 WORKS JUST FINE- AND FOR LESS MONEY

      Pros:

      Quality Lenses

      Cons:

      Comments:

      Just started imaging with a Celestron NexImage. Ordered the IR Cut filter because I had trouble getting a clear focus on the Moon. I was concerend at first because the GSO brand isn't well known, but the product works fine and the service from Agena was first rate.

      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