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GSO Parabolic Primary and Secondary Mirror Set - 6" f/8

4.8 (8 Reviews) Read Reviews Write Review
Brand GSO
Part Number PATM-GS-P6F8SET
Availability available

Product Info

Manufacturer Description

For years, GSO has made dobsonian telescopes sold under various labels. Users of these scopes know the excellent quality of the optics included, and they have a well-deserved reputation for being the finest mirrors in their price range. We are now pleased to offer virtually the entire line of GSO's Newtonian optics in the US market.

GSO's parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. Ranging in aperture from 6” to 16” and offered in various f-ratios, these mirrors are made from optical grade BK-7 glass. All mirrors have a reflective aluminum coating with a reflectivity of 92-93%. The aluminum coating is protected by a silicon oxide (SiO2) over-coating. GSO's elliptical flat mirrors have the same high quality as their parabolic primary mirrors.

GSO uses high-volume, state-of-the-art, high quality manufacturing and test lines. GSO guarantees diffraction limited performance, but their mirrors typically have a mirror surface quality of 1/16 wave RMS at least, and often better. This very smooth mirror surface results in excellent optical performance with practically no light scatter.

Please Note:

Most parabolic mirrors will have 2-4 minor uncoated areas along the edge of the mirror. See photo 3 above for an example. These are caused by the clips used to hold the mirrors in the coating chamber. Note that these are not defects. A couple of these uncoated edge strips will typically be covered up by the clips in your mirror cell anyway.

Additional Information:

Q. Is a test report included with each mirror?
A. No. GSO tests each mirror via laser interferometry before shipping, but does not provide individual test reports.


Q. Is the primary center-dotted?
A. Sometimes yes but mostly no. It just varies from batch to batch.

You can easily center-dot the primary yourself if the mirror you receive is not dotted. Instructions to do this are readily available on the internet. If you want a center-dotting sticker, just request one from us at the time you place your order.

If you want a mirror that does not have this center dot, please check with us before your purchase. Removing the center dot is not easy or recommended. If the mirror already has a center dot but you do not want it, we recommend that you not purchase this item.

Reviews

4.8 (Based on 8 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      Review by Nicolas R.
      1523888540
      Apr 16, 2018

      5.0 Clean Mirror

      Pros:

      Cons:

      Comments:

      These were two clean mirrors that we used for schlieren imaging.

      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 Ricard C.
      1515849879
      Jan 13, 2018

      5.0 Excellent packaging, perfect condition

      Pros:

      Cons:

      Comments:

      Excellent packaging, perfect condition

      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 J.S. Rodriguez
      1515537860
      Jan 9, 2018

      5.0 Great set of mirrors

      Pros:

      Cons:

      Comments:

      Speedy service, the mirrors arrived well packaged for the trip with no problems. I will use the mirrors to make a 6 inch Newtonian telescope. I can’t wait to test them. I would order again from this site

      Bottom Line: Would you recommend this item? Yes
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      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      Review by John B.
      1512237141
      Dec 2, 2017

      4.0 f/8 lense

      Pros:

      Cons:

      Comments:

      Works GREAT!! Now i can look at Nibiru and it's planetary system!!!

      Bottom Line: Would you recommend this item? Yes
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      This review was provided courtesy of AgenaAstro.com

    5. Guest

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      Review by Stargazermatt of Anderson, SC.
      1457740800
      Mar 11, 2016

      5.0 Great value

      Pros:

      Cons:

      Comments:

      Speedy service, well packaged for the trip. Used to make a 6 inch Dobsonian for a 6th grade class. Excellent and clear views when the scope was finished. Would order from you again, and have recommended the same to several of my teacher friends.

      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 LarryBear of Vashon Island, WA.
      1454630400
      Feb 4, 2016

      5.0 Perfect Mirror

      Pros:

      Perfect Parabola

      Cons:

      Comments:

      This mirror gives the best detail of any mirror I have ever used. I tested it with my Foucault tester and it is near perfectly parabolic all the way to the edge.

      Bottom Line: Would you recommend this item? Yes
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      This review was provided courtesy of AgenaAstro.com

    7. Guest

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      Review by smithadri of Durban, South Africa.
      1410048000
      Sep 6, 2014

      5.0 Great telescope mirror

      Pros:

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

      Cons:

      Heavy

      Comments:

      Atm, first light last night, stunning!

      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 ralph of Houston, TX.
      1386460800
      Dec 7, 2013

      4.0 Excellent quality mirror

      Pros:

      On Time Delivery,Good Packaging

      Cons:

      Comments:

      This mirror exceeds the quality of the original and was a direct replacement for my 40+ yr old telescope. I did not have to modify the mirror mount or adjust the focal plane.

      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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