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GSO Telescope Tube Mounting Rings (Set of 2) - 90mm (3.54")

4.8 (36 Reviews) Read Reviews Write Review
Brand GSO
Part Number TR300
Availability available

Product Info

Manufacturer Description

High quality, cast-aluminum mounting rings that can be used for mounting telescope tubes on various mounts or on guidescope rails. All rings are hinged, felt-lined and have clamp-style rings for easy mounting or repositioning of the optical tube. The large clamp knob permits easy handling in all conditions, with or without gloves. The base of the rings is threaded for 6mm metric screws (not included but available at most hardware stores). Gunmetal grey finish. Each ring weighs Xoz/Yg (Coming soon). Price shown is for a set of 2 rings.

Reviews

4.8 (Based on 36 Reviews) 97% of reviewers recommended this product.
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    1. Guest

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      Review by WILLLIAM J.
      1551707085
      Mar 4, 2019

      5.0 Solid, well-machined and nicely designed

      Pros:

      Cons:

      Comments:

      Solid, well-machined and nicely designed with large, knob-like tightening bolts. I under-estimated the tube diameter I needed for my ED triplet but these did the job with the extra 'play' in the bolt design. You get what you pay for.

      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 Charles W.
      1545626445
      Dec 23, 2018

      5.0 Work perfectly

      Pros:

      Cons:

      Comments:

      I used these to attach an 80mm OTA to a Unitron 114 mount. Even though the tube is only 86mm in diameter, these provide a solid connection when tightened all the way down. Just be aware that it is necessary to buy 6mm screws at the length needed, in order to use them.

      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 Dick M.
      1538075129
      Sep 27, 2018

      5.0 90mm rings

      Pros:

      Cons:

      Comments:

      Worked perfectly, at a good price, with excellent service.

      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 Tim K.
      1532952751
      Jul 30, 2018

      5.0 Tube Rings

      Pros:

      Cons:

      Comments:

      Good quality for the price

      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 Roderick B.
      1527275353
      May 25, 2018

      5.0 Extremely Satisfied

      Pros:

      Cons:

      Comments:

      Order 90mm rings and arrived at indicated timeframe and were as stated in documentation. I received exactly what I required.

      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 Michael G.
      1526206548
      May 13, 2018

      4.0 Great product but recommend supplying bolts for dovetail.

      Pros:

      Cons:

      Comments:

      I bought these rings for an old Meade DS90EC, a 90mm refractor I’ve had for years. The scope originally came with a shaky alt-az mount. Recently I’ve bought an Orion SkyView Pro equatorial mount. These tube rings fit perfectly around the OD of the 90mm telescope. The only issue I ran into was a lack of bolts to mount to a dovetail so that I can get the scope mounted. I recommend finding out the bolt size and thread pitch before perchacing so you can at least make the trip to the hardware store while your waiting on shipping.

      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 Mel W.
      1513136775
      Dec 12, 2017

      5.0 GSO tube rings 90mm

      Pros:

      Cons:

      Comments:

      Worked as expected. Just need some tolerable weather to test them out.

      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 William R.
      1513008607
      Dec 11, 2017

      5.0 GSO rings

      Pros:

      Cons:

      Comments:

      Works great for my Explore Scientific ED80.

      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 Douglas H.
      1510221799
      Nov 9, 2017

      4.0 90 mm tube rings.

      Pros:

      Cons:

      Comments:

      Least expensive hinged rings. Work as well as any, but no provision for mounting anything on top.

      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 Brian S.
      1505475008
      Sep 15, 2017

      5.0 Excellent upgrade for Orion Astroview 90 Tube Rings

      Pros:

      Cons:

      Comments:

      These rings are well-made and light-weight. The thumb screws are huge and easy to work, even with gloves on. They are a very inexpensive, high-quality upgrade to the cheap tube rings that Orion packs with its excellent Astroview 90 telescopes.

      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 Carl W.
      1503194402
      Aug 19, 2017

      5.0 Tube rings

      Pros:

      Cons:

      Comments:

      Bought these rings to use on my Orion ST80. Also bought the GSO focuser for this scope and new V-bar. Wanted a solid, compact small scope for the eclipse. This is perfect

      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 Donald C.
      1501950395
      Aug 5, 2017

      4.0 Very functional 90mm tube rings

      Pros:

      Cons:

      Comments:

      I bought these rings to mount an Orion ST80 refractor on a small tracking mount. They are lighter weight than some rings, and that was important for me in this application. They work very well and I am pleased with the product. A minor quibble is that the rings require metric bolts to mount, and these are not provided as part of the product.

      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 David F.
      1498908640
      Jul 1, 2017

      5.0 Good for for my old Meade 90mm

      Pros:

      Cons:

      Comments:

      I needed rings for my older Meade 90mm telescope. It fit with ease then mounted easily to the dovetail mounts. Now that I have it mounted to my Exos-2 mount, the is much more enjoyable!

      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 Raymond T.
      1495037450
      May 17, 2017

      5.0 They hold the tube solidly

      Pros:

      Cons:

      Comments:

      It does use 1/4" bolts to secure the ring to the mount. I mounted it on a Vixen style dovetail w/ 6mm holes, this required a little modification, using drill press & a 15/64 bit and a larger bit to make countersink holes to accommodate the bolt heads in the dovetail.

      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 Gary P.
      1492015646
      Apr 12, 2017

      5.0 90mm mounting rings

      Pros:

      Cons:

      Comments:

      Perfect fit, well made

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

      This review was provided courtesy of AgenaAstro.com

    16. hhowardn

      hhowardn New Member

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      Review by Howard N.
      1490191210
      Mar 22, 2017

      5.0 Just what I needed

      Pros:

      Cons:

      Comments:

      These were a perfect fit for my new Orion ST80. They are very well built with knobs that are easy to turn. Agena was nice enough to provide the weight even when I asked.

      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 Victor B.
      1487350702
      Feb 17, 2017

      5.0 GSO 90mm tube rings

      Pros:

      Cons:

      Comments:

      Recommended. These rings are well made. I bought these to use with both a ST90 and 900mm 90mm scopes which have slightly different tube diameters and they work well with both. The latch is more convenient to use than some other brands because I only have to be unscrewed it part way and swung open to change scopes where with some others have to be completely unscrewed. These do not have a camera stud or threaded holes for an accessory attachment which is not a problem in my use.

      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 Rich of New Jersey US.
      1457740800
      Mar 11, 2016

      5.0 Perfect for 90mm refractors

      Pros:

      Strong Construction,Accurate

      Cons:

      Comments:

      This set of rings work perfect for 90mm reflectors or 80mm Ed (apo), sometimes I change it from scope to scope, they work perfect.

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

      This review was provided courtesy of AgenaAstro.com

    19. Dr. Ski

      Dr. Ski Well-Known Member

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      Review by Dr. Ski of Obscure Philippine island.
      1444348800
      Oct 8, 2015

      5.0 Perfect!

      Pros:

      Lightweight,Easy to Use,Strong Construction

      Cons:

      Comments:

      Great value! Used these to refurbish my old Orion Short-Tube 90 (the resin mount that held the 1/4-20 tripod disintegrated!). It's like a new scope now.

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

      This review was provided courtesy of AgenaAstro.com

    20. Jim O'Connor

      Jim O'Connor Active Member

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      Review by Skylook123 of Tucson, AZ.
      1436313600
      Jul 7, 2015

      4.0 High Quality Bargain, But Wish It Had Vixen Threads

      Pros:

      Easy to Use,Accurate,Strong Construction

      Cons:

      Comments:

      The rings perfectly fit my 90mm Orion ShortTube refractor. However, I use it for imaging so the standard small mount plate needed to be removed to allow for the aft CG with a camera, Barlow, and new focuser. That requires the Vixen 12" dovetail, but the threads for these rings are 6mm, which don't match the Vixen standard nor the original Orion attachment bolt.

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

      This review was provided courtesy of AgenaAstro.com

    21. Guest

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      Review by Chris G of Chicago, IL.
      1435363200
      Jun 26, 2015

      5.0 Good tube rings

      Pros:

      Compact,Easy to Use,Strong Construction

      Cons:

      Comments:

      Use this for my Orion ST80 as a guide scope. Clam shells hold the tube tightly with no slop.

      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 Tom Wheeler of Bryan, Ohio.
      1424563200
      Feb 21, 2015

      5.0 Great Value

      Pros:

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

      Cons:

      Comments:

      I use these rings with my Short Tube 80 guidescope. They clamp well without overtightening, and the clamp knobs are easy to use while wearing gloves. They do everything I wanted them to do, at lower cost than some inferior rings.

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

      This review was provided courtesy of AgenaAstro.com

    23. Guest

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      Review by Albert of Hinesville, GA.
      1422921600
      Feb 2, 2015

      5.0 Perfect

      Pros:

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

      Cons:

      Comments:

      The rings fit my Celestron/Vixen first scope tube perfectly. Light weight, excellent construction, good price. If I need rings in the future, I'm checking here first. Albert

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

      This review was provided courtesy of AgenaAstro.com

    24. Guest

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      Review by Brett of OK.
      1422748800
      Jan 31, 2015

      5.0 Solid rings

      Pros:

      Strong Construction,Easy to Use,Accurate

      Cons:

      Comments:

      These rings are of solid construction and perform their function perfectly. A good buy. For reference these are being using my white tube ES ED80 80mm.

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

      This review was provided courtesy of AgenaAstro.com

    25. Guest

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      Review by AtomB of Phoenix, AZ.
      1413590400
      Oct 17, 2014

      4.0 Simple and functional - a good thing

      Pros:

      Lightweight,Easy to Use

      Cons:

      Comments:

      These tube mounting rings are built better than the typical cast aluminum tube mounting rings included with many common refractors. They have a more solid feel, and use more substantial hardware. The design of the base doesn't allow the ends of the dovetail mounting bolts to protrude towards the OTA. The long plastic hand knobs with brass inserts are very easy to rotate in cold weather.

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

      This review was provided courtesy of AgenaAstro.com

    26. Guest

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      Review by Miguel Reyes of Mexico.
      1413590400
      Oct 17, 2014

      4.0 You may need this on your 80mm refractor

      Pros:

      Nice Finished,Strong Construction,Price,Easy to Use

      Cons:

      A little bit heavy

      Comments:

      I use these rings with the ST-80, no more flexure in my guiding gear, I would recommend it.

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

      This review was provided courtesy of AgenaAstro.com

    27. Guest

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      Review by Gary of Mpls, MN.
      1404345600
      Jul 2, 2014

      5.0 Perfect fit and function

      Pros:

      Lightweight,Strong Construction,Easy to Use

      Cons:

      Comments:

      PERFECT!!! Fit my Sellarvue 80ED tube like a glove. I like the tall adjustment knobs because they are easy to find and use in the dark. Thanks for everything you've done for me Agena. It's all been appreciated and you're the best.

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

      This review was provided courtesy of AgenaAstro.com

    28. Guest

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      Review by Obin Robinson of League City, TX.
      1397260800
      Apr 11, 2014

      5.0 Perfect for a grab and go ST-80 or ED-80

      Pros:

      Lightweight,Compact,Easy to Use

      Cons:

      Comments:

      These rings will fit a Celestron ED-80 or an Orion ST-80 perfectly. They grab the tube very securely and it will not slip even with a heavy camera or diagonal and eyepiece. I would happily buy more of these whenever I need them in the future.

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

      This review was provided courtesy of AgenaAstro.com

    29. Guest

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      Review by Balu of Bloomington, IN.
      1390780800
      Jan 26, 2014

      5.0 Good value for the money

      Pros:

      Strong Construction,Easy to Use

      Cons:

      Comments:

      I got these tube rings from Agena for use with my 80mm apo refractor. I really like the large holding screws that make it a breeze to use even in cold weather when wearing gloves.

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

      This review was provided courtesy of AgenaAstro.com

    30. Guest

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      Review by RavensByte of Andover, MN.
      1380844800
      Oct 3, 2013

      5.0 Great Deal!

      Pros:

      Easy to Use,Strong Construction

      Cons:

      Comments:

      This product does exactly what it's suppose to do and this is a great price. Construction is good enough that I expect it will last me the rest of my life.

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

      This review was provided courtesy of AgenaAstro.com

    31. Guest

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      Review by Sungryul of Busan, S.Korea.
      1365465600
      Apr 8, 2013

      4.0 Satisfied..

      Pros:

      Strong Construction,Easy to Use

      Cons:

      Comments:

      I bought this item for mounting Celestron 80mm guidescope on Edge HD 11'". It was stable and I am satisfied with this item..
      One drawback is, in my item, one fixation knob screw is shorter while another one is normal length, so I always am careful not to drop off the knob. It aggravates me a little.

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

      This review was provided courtesy of AgenaAstro.com

    32. rreddy2go

      rreddy2go New Member

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      Review by rreddy2go of Tulsa, OK.
      1364169600
      Mar 24, 2013

      5.0 Perfect match for Orion ST80

      Pros:

      Easy to Use,Lightweight,Strong Construction,Accurate

      Cons:

      Comments:

      I was looking for a pair of rings to mount my ST80 that didn't have the drilled & tapped holes on top. These fit the bill perfectly. Agena Astro has outstanding service & selection. They have proved to be best source for hard to find items, such as eyepiece caps and plugs.

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

      This review was provided courtesy of AgenaAstro.com

    33. MAK7

      MAK7 New Member

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      Review by BDGAstro of Phoenix, AZ.
      1361059200
      Feb 16, 2013

      4.0 Quality with economy

      Pros:

      Easy to Use,Lightweight,Strong Construction

      Cons:

      Comments:

      These rings are very good for the price. The ring has a wide enough width for strong and secure hold on the OTA. Good solid felt all the way around to protect the OTA. Though they are cast rather than machined, they are done very well and provide a good flex free mounting. I find them perfect for mounting a guide scope on top of an imaging scope using accessory adapters mounted to the rings.

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

      This review was provided courtesy of AgenaAstro.com

    34. Guest

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      Review by Comet57 of Western PA.
      1307145600
      Jun 3, 2011

      4.0 Better Than Expected

      Pros:

      Strong Construction

      Cons:

      Comments:

      Bought the rings for a Mak guidescope and found them solidly made. Hinges are strong and latching mechanism good.

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

      This review was provided courtesy of AgenaAstro.com

    35. Guest

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      Review by kid cincy of Cincinnati, OH.
      1272672000
      Apr 30, 2010

      5.0 Work great!

      Pros:

      Strong Construction

      Cons:

      Comments:

      Ordered these to mount my Meade 390 refractor on my CG-5 mount. They work great. Easy to adjust when necessary, but honestly, I just put them on and forgot about them. They work exactly as they should.

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

      This review was provided courtesy of AgenaAstro.com

    36. Guest

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      Review by Atrao Joe of St Louis.
      1243382400
      May 26, 2009

      5.0 Great Buy!

      Pros:

      Strong Construction

      Cons:

      Comments:

      Great value! I use the tube ring to mount my Megrez 90 FD. The fit was perfect and added stability to my mount. Recommended!

      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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