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GSO 2" 90-deg 99% Dielectric Mirror Diagonal for SCTs

4.8 (33 Reviews) Read Reviews Write Review
Brand GSO
Part Number GSDSCT
Availability available

Product Info

Manufacturer Description

GSO's 2" SCT diagonal features dielectric coatings with 99% reflectivity across the visible spectrum and a 1/12 wave BK7 mirror. The all metal diagonal body is CNC machined. The combined result is a superb diagonal offering excellent mechanical and optical quality at a great price. Dielectric coatings are more durable than regular or enhanced aluminum coatings, so you will enjoy years of excellent performance from this product. Diagonals with comparable quality and specifications often sell for $150 or more in today's astronomy market.

You can attach this diagonal directly to Schmidt-Cassegrain telescopes and many Maksutov-Cassegrain telescopes, as long as there is a SCT male thread on the telescope. The standard SCT thread is a 2"x24tpi thread.

A 1.25"-2" adapter is included so you can use this diagonal with 1.25" or 2" eyepieces. The 1.25" and 2" holders both feature a brass compression ring, so your eyepiece barrels will not be scratched by the set screw. The 1.25"-2" adapter is also threaded to accept 2" filters. The clear aperture is 38.2mm.

The diagonal comes in a very nice foam-fitted storage box and includes 2 end caps. Weight = 1lb-4oz. (with 1.25" adapter); 1lb-1oz. (without 1.25" adapter). Made in Taiwan.

Reviews

4.8 (Based on 33 Reviews) 94% of reviewers recommended this product.
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    1. Guest

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      Review by Vladimir A.
      1548163033
      Jan 22, 2019

      5.0 Heavy, but very good

      Pros:

      Cons:

      Comments:

      I got this diagonal to be able to sin: to use my C6 with my 2" 20mm 82° Meade UWA eyepiece AND my Meade F6.3 reducer. It worked and I enjoyed the view of the Pleiades (it's so much better than with the equivalent 32mm Plössl). However, because the C6 baffle tube is small this configuration likely has a little vignetting (and with a 34mm SWA there was a lot of it). This purchase made sense for me because I already had the 20mm 82°, but for most owners of a C6 SCT with reducer, a 24mm ES68 eyepiece is probably a better idea.

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

      This review was provided courtesy of AgenaAstro.com

    2. M11Mike

      M11Mike New Member

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      Review by Michael P.
      1531411146
      Jul 12, 2018

      5.0 GSO 2" Mirror Diagonal (99% Dielectric)

      Pros:

      Cons:

      Comments:

      Superb diagonal - meets and exceeds my intermediate level observing requirements. HIGHEST QUALITY - excellent workmanship and materials, fit and finish. WORKS SUPERBLY. Highly recommended for anyone who needs a really good 2" diagonal. MP Ballston Lake, NY

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

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      Review by Jeff W.
      1528124617
      Jun 4, 2018

      5.0 Brass rings to secure eyepiece,

      Pros:

      Cons:

      Comments:

      Brass rings to secure eyepiece, high quality mirror.

      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 Ralph R.
      1515376215
      Jan 7, 2018

      5.0 Great product and great company

      Pros:

      Cons:

      Comments:

      Great product and great company to deal with

      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 William K.
      1505617417
      Sep 16, 2017

      4.0 A very nice diagonal.

      Pros:

      Cons:

      Comments:

      I would have given it 5 stars, but I found very the diagonal easily unscrews from the body, causing the diagonal to sag or drop with heavy eyepieces. There is no good way to get it snug other than to grasp the short extension tube and tighten it into the diagonal body. The upside is the body wil readily thread onto the 2" thread of my refractor! Otherwise, the view is magnificent when compared to the diagonal supplied with either my C8, or my C80ed.

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

      This review was provided courtesy of AgenaAstro.com

    6. nickc

      nickc New Member

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      Review by Nicholas C.
      1497536605
      Jun 15, 2017

      5.0 2" GSO Dielectric Diagonal for SCT

      Pros:

      Cons:

      Comments:

      This is an excellent value and huge upgrade over the stock diagonal that came with the telescope. I use it on my C8 SCT. The diagonal allows the use of either 2" or 1,25" eyepieces in order to get a maximum fov. I like it a lot. I have purchased other items from Agena and have always been pleased with all aspects of their service.

      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 Astronomy teacher of Massachusetts.
      1475366400
      Oct 1, 2016

      5.0 Excellent replacement for stock diagonal

      Pros:

      Strong Construction,Easy to Use,Quality Lenses

      Cons:

      Comments:

      I wanted to be able to use some of the 2" wide field eyepieces that I already have for a bigger scope with a Nexstar 6SE that I use for outreach events, but without spending a fortune on a high-end diagonal. The GSO diagonal fit the rear cell threads perfectly and its optical quality is well matched to this use. Direct coupling to the rear cell and the resulting optical path length also enables getting the maximum 1.3 degree view from this f10 SCT, which was important for being able to show students and visitors things like the full extent of the Pleiades or both of Bode's Nebulae in one view. I've been very pleased with the solid construction and the high quality finish. The optical quality appears to be at least as good as the telescope itself, as I see no significant difference between views through it and straight-through views without it. Of course, it gives a much more comfortable eye position than straight-through viewing, and its larger size puts the eyepiece further back and out from the rear cell, making it even easier for people to place their eye without bumping the OTA. On the 6SE it still clears the base of the mount if the OTA is shifted forward in the dovetail (necessary for balancing the heavier diagonal and eyepieces as well). The compression ring design hasn't scratched any eyepiece barrels. Overall this meets my goals perfectly.

      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 Rick of QC, Canada.
      1469318400
      Jul 23, 2016

      5.0 Great Diagonal

      Pros:

      Strong Construction,Accurate,Easy to Use

      Cons:

      Heavy

      Comments:

      Great product, excellent finish. Threads directly into the rear baffle of your SCT (no need for visual back) thus saving on back focus. Ring pins for holding both 1.25" and 2" eyepieces works flawlessly.

      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 Dean of Philippines.
      1461456000
      Apr 23, 2016

      5.0 Nice product. Can also be used as a T-adaptor :)

      Pros:

      Strong Construction

      Cons:

      Heavy

      Comments:

      Fit and finish is top notch!!! Tried to view M42 and the image is bright.

      The SCT nose piece can be removed and to my surprise it was threaded to fit my T-ring. Now I don't have to buy an SCT T-adaptor and use this instead. I only need to find a suitable dust cap for the diagonal so that the mirror is protected once the nose piece is removed.

      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 DrDyno of St. Petersburg, FL.
      1453593600
      Jan 23, 2016

      5.0 Great Value! Great Views!!

      Pros:

      Easy to Use,Strong Construction,Accurate

      Cons:

      Comments:

      Excellent star diagonal... a real gem for the money! Construction is very impressive as are the views through it.

      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 Ronald of Manila, Philippines.
      1445817600
      Oct 25, 2015

      4.0 Nice addition to you SCT arsenal.

      Pros:

      Strong Construction,Quality Lenses

      Cons:

      Heavy

      Comments:

      Adds a little more bulk to my 6" SCT telescope. Probably an overkill to have a large diagonal.

      However, it gives me peace of mind that the diagonal is properly screwed on to the telescope. I bought it to reduce the risk of the diagonal falling off and and breaking my eyepices.

      This would probably be better for 8" or larger SCTs. But am happy having it on my 6". Makes it look more professional. Cheaper alternative to Celestron's 2" dielectric diagonal for SCTs.

      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 ChickenFried of Warner Robins, GA.
      1401494400
      May 30, 2014

      5.0 Deserved Praise

      Pros:

      Accurate,Strong Construction,Quality Lenses,Easy to Use

      Cons:

      Heavy

      Comments:

      I bought this to replace the standard diagonal that came with my Celestron NexStar 6SE telescope and the difference is wonderful, it made me feel as if I'd bought an upgrade package! I do not have any other diagonals to compare it to but for the money I can't imagine finding a better product to improve your night time viewing experience!

      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 donusn of Pensacola, FL.
      1392163200
      Feb 11, 2014

      5.0 Superb Performance and Value

      Pros:

      Compact,Easy to Use,Strong Construction

      Cons:

      Comments:

      Best value for performance in 2" diagonals -- great way to move up to 2" SCT observing.

      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 Xeroid of USA.
      1386806400
      Dec 11, 2013

      5.0 Wonderful!

      Pros:

      Strong Construction,Quality Lenses,Easy to Use,Accurate

      Cons:

      None

      Comments:

      I am extremely pleased that I can use the GSO's 2" SCT diagonal on 3 different telescopes due to its unique features: optional 2" nose piece and removable SCT/T2 adapter. Solid and very heavy, using it gives excellent image brightness and clarity. I love it...

      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 Jeff of Fort Collins, CO.
      1375747200
      Aug 5, 2013

      4.0 Great diagonal upgrade

      Pros:

      Easy to Use,Strong Construction

      Cons:

      Comments:

      Holds my Baader Zoom and DSLR securely. Gives enough clearance even at 90 degrees with my Nexstar 8SE.

      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 Victor of Piracicaba, Brazil.
      1375488000
      Aug 2, 2013

      5.0 Excellent for replace original brands

      Pros:

      Accurate,Strong Construction,Easy to Use

      Cons:

      Comments:

      Great quality item, good price

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

      This review was provided courtesy of AgenaAstro.com

    17. Guest

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      Review by Jon of Las Vegas, NV.
      1330300800
      Feb 26, 2012

      5.0 Good product, Quick shipping

      Pros:

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

      Cons:

      Comments:

      Good quality diagonal mirror at a reasonable price

      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 Jeff of Camdenton, MO.
      1325116800
      Dec 28, 2011

      5.0 Nice Diagonal

      Pros:

      Strong Construction,Well built quality

      Cons:

      Comments:

      Very nice well built diagonal fits nicely on my nexstar 8se and you can switch from 1.25" lenses to 2" lenses with out much effort. All in all worth every cent.

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

      This review was provided courtesy of AgenaAstro.com

    19. Guest

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      Review by svtdoug of Washington State.
      1319846400
      Oct 28, 2011

      5.0 GSO 2" Diagonal

      Pros:

      Strong Construction

      Cons:

      Comments:

      Optics are excellent, well constructed.

      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 pierre007 of Rio Rancho, NM.
      1307750400
      Jun 10, 2011

      5.0 Good Value for the price

      Pros:

      Compact,Quality Lenses,Strong Construction

      Cons:

      Comments:

      This diagonal is compact and well constructed and is on par with much more expensive diagonals.

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

      This review was provided courtesy of AgenaAstro.com

    21. Tim

      Tim New Member

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      Review by Tim of Eastern Iowa.
      1294185600
      Jan 4, 2011

      5.0 Great Diagonal

      Pros:

      Great optics,Strong Construction

      Cons:

      None

      Comments:

      This is a great diagonal. I use it with my Celestron C8 SCT. The optical quality and build are very good, and it is nice to use 2 inch eyepieces for wide views. The compression ring does not scratch my eyepieces either.

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

      This review was provided courtesy of AgenaAstro.com

    22. tjhayko

      tjhayko New Member

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      Review by Tom of Outside Toronto, Ontario, Canada.
      1294012800
      Jan 2, 2011

      4.0 More than good enough for any scope

      Pros:

      Strong Construction,2" adapter is solid

      Cons:

      Comments:

      I originally bought one of these for my C8. I tried it with my William Optics 66mm refractor, and immediately ordered a second one. I'm not sure how any diagonal could be any better. Very solidly made, and very versatile.

      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 NorskeBob of Oswego, NY.
      1284508800
      Sep 14, 2010

      5.0 GSO 2" diagonal

      Pros:

      Strong Construction,Quality Lenses,Accurate

      Cons:

      Comments:

      Replaced the 90 degree 1 1/4 on my Celestron 8SE. I wanted some 2" eyepeice options. I am pleased with the construction. Tried it out day viewing of the moon so far (cloudy tonight). Good fit on the 8SE. The SCT design provides the appropriate clearances for direct overhead viewing.

      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 k4thecrochunter of Crossville, TN.
      1272672000
      Apr 30, 2010

      4.0 Works for me!

      Pros:

      Quality Lenses,Strong Construction

      Cons:

      Heavy

      Comments:

      I use this diagonal on a Celestron N8GPS and I found it to fit the bill quite nicely, allowing me the use of 2" eyepieces.

      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 Nick of Ohio, USA.
      1272326400
      Apr 26, 2010

      5.0 Incredible!

      Pros:

      Strong Construction,Beautiful

      Cons:

      None

      Comments:

      I was upgrading from the Celestron stock diagonal, and had never seen a "real" diagonal, so wasn't sure what to expect, except that a very well respected and highly experienced astronomer had suggested the GSO. When I opened the box, I was totally stunned. The GSO diagonal is machined from a huge piece of solid aluminum with real heft and a beautiful finish. I just can't fault this perfect scientific instrument. It's cloudy right now, but I love this thing so much - its perfect construction and quality feel - that I just keep holding it and looking at it! If you are still using your stock diagonal, you really MUST upgrade, because even the highest quality scope is only as good as its weakest part. And based on my experience and the experiences of others, I can't imagine any better diagonal on the entire planet than this GSO. I work in a scientific research lab as Director, and I'm no stranger to making important equipment purchases. Well, take it from me: If this GSO diagonal was being sold in the commercial market instead of to private individuals, it would be well over $1,000. No kidding. So the bottom line is: 1) The GSO diagonal is unbelievable value for money and the highest imaginable quality. 2) For my next purchase, I will be checking to see if AGENA sells it, and if it does, I will not bother checking other suppliers. I'm ecstatic about this experience!

      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 John of Kalispell, Montana.
      1265932800
      Feb 11, 2010

      5.0 Bang for the buck

      Pros:

      Strong Construction

      Cons:

      Comments:

      Love the fact that I can loosen the threaded ring, rotate the diagonal, and then lock it down secure. The SCT adapter brings the diagonal in close and cuts down on the increased focal length that a 2" visual back and a refractor diagonal would otherwise provide. Though I also recieved the 2" refractor barrel and have made it a very versatile instrument. The low profile 1.25" adapter also aids in the control of increased focal length. Great product, even better price.

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

      This review was provided courtesy of AgenaAstro.com

    27. Guest

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      Review by yoshac of Boston, MA.
      1265932800
      Feb 11, 2010

      5.0 High quality, low cost 2" diagonal

      Pros:

      Quality Lenses,Strong Construction

      Cons:

      Comments:

      The GSO 2" mirror diagonal has a high quality 1/12 wave mirror, and a solid feeling CNC machine body.

      I've been using it for about 3 months now, and I can definitely recommend it as a 2" upgrade for anyone currently using 1.25" eyepieces.

      The diagonal also includes a 1.25" to 2" low-profile adapter, which means you can continue using your smaller eyepieces and migrate gradually to the 2" optics.

      For the price, this diagonal compares very well to more expensive offerings such as William Optics 2" diagonal.

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

      This review was provided courtesy of AgenaAstro.com

    28. Steve

      Steve New Member

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      Review by Steve of Pennsburg, Pennsylvania.
      1257897600
      Nov 10, 2009

      5.0 Best upgrade for your SCT

      Pros:

      Compact,Strong Construction,Accurate,Quality Lenses

      Cons:

      Comments:

      I replaced my 1.25 diagonal with this 2 inch GSO.
      I immediately noticed that the stars were brighter and crisper.This has been the best upgrade to my 8 inch SCT. I had to add a little more weight up front to balance the scope better.
      The diagonal is solidly constructed and the mirror is flawless. I like the security of the compression rings to hold in my eyepieces

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

      This review was provided courtesy of AgenaAstro.com

    29. Steve

      Steve New Member

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      Review by Steve of Pennsburg, PA.
      1252540800
      Sep 9, 2009

      5.0 Excellent upgrade for the money

      Pros:

      Quality Lenses,Strong Construction

      Cons:

      Comments:

      I bought this as a upgrade to replace my stock diagonal on my C8. The diagonal gives plenty of room to swing my C8 for polar alignment. The optics are sharp and increases the light gathering by quite a few percent. Far superior to the Celestron diagonal. The second best upgrade to my scope. (Telrad being the 1st)

      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 The DINK of Upstate SC.
      1243468800
      May 27, 2009

      4.0 Good diagonal for the price

      Pros:

      Quality Lenses

      Cons:

      Comments:

      I have had one of these hooked up to my Nexstar 8 for about 2 years, and I can honestly say that I have never regretted getting one. I haven't had much call to check prices since then, but at the time it was by far the cheapest dielectric out there. If I had to criticize anything about it, it would be the way they have the insert for the 1.25 adapter. There is a gap cut out of the side to allow for the thumb screw of the adapter. What happens is that when you use a 2 inch EP the compression ring for the 2 inch slips around and covers this gap so that the adapter won't fit until you push the compression ring back out of the way. It isn't really a problem, but it is a little annoying.

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

      This review was provided courtesy of AgenaAstro.com

    31. Guest

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      Review by Jim B of Brighton,TN.
      1243382400
      May 26, 2009

      5.0 No need for anything better!

      Pros:

      Strong Construction,Quality Lenses

      Cons:

      Comments:

      Many diagonals degrade the optical performance of an otherwise fine telescope, or have poor quality plastic parts - or both. A so-so diagonal on a superb telescope makes the scope so-so in an instant. Not so with this 2" GSO! It excels in every way, and even has brass compression rings for both 2" and 1-1/4" eyepieces so they won't get set-screwed! Would buy again without a second thought. Highest recommendation.

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

      This review was provided courtesy of AgenaAstro.com

    32. Guest

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      Review by Skwalker of Rochester, NY.
      1243382400
      May 26, 2009

      4.0 Plenty of Light through this Diagonal

      Pros:

      Accurate,Great value for the money,Strong Construction

      Cons:

      Comments:

      Don't be fooled by the price.. this is a quality diagonal!

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

      This review was provided courtesy of AgenaAstro.com

    33. AstroGuy1

      AstroGuy1 New Member

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      Review by tjhayko of Canada.
      1227830400
      Nov 27, 2008

      4.0 Solidly built, good images

      Pros:

      Good value,Solidly built,Better than stock diagona

      Cons:

      None noticeable

      Comments:

      I bought this to replace the stock 1.25" diagonal that came with my second hand Nexstar 8 GPS, and I'm happy with my purchase.

      It seems to be solidly built, threads on very cleanly and I think the images are bit brighter than the stock diagonal.

      I also like the fact that Agena Astroproducts sells the chrome refractor style end tube separately, and I bought that and a 2" SCT adapter at the same time so I could use it both ways (mainly for filters and threading the barlow from 20mm 80 degree Agena UWA eyepiece in before the diagonal).

      Good value, especially for the price, and I love the versatility of using it with filters and the barlow element.

      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