Introducing the New William Optics 2015 Dura-Bright diagonal - a dramatic step forward in the evolution of mirror diagonals!
This 90° 2"mirror-type star diagonal has a Dura-Bright 12mm thick mirror, 1/12 or better wave surface accuracy, and dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations. Features a 2" nosepiece for insertion into refractor telescopes and other 2" focuser barrels.
Dura-Bright features 100% real carbon fiber side plates that add that touch of class your scope deserves.
The WO 2" Dura-Bright Diagonal was designed with several unique features to provide optimum performance and years of use.
Top-Notch Performance and brightness
- Dielectric coating allows 99% reflectivity.
- High precision 12mm thick mirror substrate flat for optimal image stability.
- Polished to 1/12th wave accuracy.
- Accurate design guarantees constant alignment. No further alignment needed.
- 2" to 1.25" eyepiece adapter included.
- Lock screw for eyepiece/adapter.
- Big, knurled thumbscrews are easy to turn even with gloves on.
- Threaded for 48mm filters.
- Patented, elegant design.
- High-quality machining out of the best aluminum.
- Internal anti-reflection baffling for highest contrast.
- Real Carbon Fiber side plates
- Compression rings (both on diagonal and adapter) to prevent barrels from marring.
- Internal safety stop prevents 2" barrels from hitting the mirror.
- Designed for high-end scope such as FLT-98, FLT-110 and FLT-132.
- Weight (without 1.25" adapter) = 15.2oz.
- Weight (with 1.25" adapter) = 1lb-2.1oz.
Apr 15, 2019
Nice diagonalPros: Cons: Comments:
First off, just so you're aware, this thing is not small. I put it on a Celestron 6SE with no problems at all. Removed the visual back, screwed this right on. Build quality feels nice and solid. The large thumb screws are nice and work well. The brass compression rings are nice as well. I don't know how accurate the thermometer is, but it's a nice little bonus. The mirror itself looks really nice. I'm not advanced enough to go into a lot of detail about quality specifics, but it does what it's supposed to. Things look good in the eyepiece. Plus the diagonal itself is nice looking. Overall I'm happy with it.
This review was provided courtesy of AgenaAstro.comSep 14, 2018
Well made unitPros: Cons: Comments:
Super clear compared to stock Celestron 1.25 in. diagonal. Superb construction quality. A little tricky to mount the first time because the mating ring fully threaded onto telescope rear cell does not cinch the unit up tight to the scope. You need to actually rotate the body (must also have threads on barrel into ring) to snug it up. Good solid connection once snugged, don't see any visible marring to rear cell. Mildly concerned for possible seizing, but so far no problem. I have taken it off and replaced it several times to put in the focal reducer between it and rear cell. Not sure what good the thermometer is, but it works.
This review was provided courtesy of AgenaAstro.comJul 8, 2017
WO 2" dialectric diagonalPros: Cons: Comments:
Bought this for my little 72mm ED refractor. After having it out 1 time so far on a clear night looking at the moon, Jupiter, & Saturn. I am really pleased at the clarity and light transmission from this diagonal. Seems to be well made for the value and it looks good on the scope! Keep in mind that this is my first diagonal (and scope) that I've ever owned...
This review was provided courtesy of AgenaAstro.comApr 11, 2017
What A DifferencePros: Cons: Comments:
I'm very new to astronomy and once I bought the Celestron 8SE I had to get a bigger diagonal. The 1.25" OEM is a fine piece but this William Optics diagonal is truly the difference between day and night. What a difference! This diagonal is wonderfully machined and the carbon sides are a nice touch; you'll have to rebalance your scope after mounting this diagonal due to it's weight; very solid and nice!
This review was provided courtesy of AgenaAstro.comSep 30, 2016
Excellent diagonal at a reasonable pricePros:
Quality Lenses,Easy to Use,Compact,Strong ConstructionCons: Comments:
I purchased this unit to replace the stock diagonal that came with one of my scopes. Much better in every way!
This review was provided courtesy of AgenaAstro.comOct 9, 2015
Perfect for Celestron 9SEPros:
Easy to Use,Strong Construction,Accurate,Quality Lenses,CompactCons: Comments:
The stock diagonal that comes with the 9SE is unacceptable and limited. This diagonal is not only well built and easy to install it is the best upgrade, besides buying a TeleVue eyepiece, for your telescope, that you can make. This diagonal will clear the base of the robotic arm so you can view stars that are straight up. An Ethos TeleVue eyepiece fits perfect in it. It really is a beautiful work of art with the carbon fiber and solid construction, not to mention the light transfer rated at 99%. You have to buy this.
This review was provided courtesy of AgenaAstro.comJun 29, 2015
The only Diagonal you'll needPros:
Strong Construction,Easy to Use,Accurate,Quality LensesCons: Comments:
If you are looking for a diagonal replacement for the cheap flimsy one that came with your 8SE like I was, then buy this one. Not only is it built solid but it does add brightness to the stars and planets. Also, a BIG plus is that it will clear the bottom of the 8SE mount, so if you want to observe objects that are straight up then you can!
This review was provided courtesy of AgenaAstro.comMar 27, 2015
One super Diagonal!Pros:
Compact,Strong Construction,Easy to UseCons:
This was a gift for my nephew, and is working on a 4 inch refrator. The tells me stars are pinpoint, clear and actually may increase the magnitude of stars visible in this scope. This diagonal is a winner.
This review was provided courtesy of AgenaAstro.comFeb 20, 2015
Good value for an outstanding opticsPros:
Quality Lenses,Lightweight,QUALITY MIRROR,Strong Construction,Easy to UseCons:
Can't Think Of Any ConsComments:
This equipment was a great upgrade replacing my former 1-1/4" star diagonal. Now I will be able to change my eyepieces to the 2" size. Images are much brighter. Good investment.
This review was provided courtesy of AgenaAstro.comOct 17, 2014
Accurate,Strong Construction,Quality Lenses,Easy to UseCons:
This finally allowed me to use 2in eyepieces on my trusty C8. What sold me was a great price and very FAST shipping. Great deal as usual from Agena!
This review was provided courtesy of AgenaAstro.comAug 16, 2014
Excellent quality diagonalPros:
Accurate,Easy to Use,Lightweight,Strong Construction,Quality LensesCons: Comments:
I trust William Optics' equipment and this diagonal does not disappoint. I purchased this diagonal for use with my WO GTF-81 and it works beautifully.
This review was provided courtesy of AgenaAstro.comAug 15, 2014
Best value in a dielectric diagonalPros:
Lightweight,Strong Construction,Easy to Use,Accurate,CompactCons:
I love this diagonal. Bright, well crafted, good brand, great warranty, excellent price.
What's not to like? I use it on my SV102 Stellarvue.
This review was provided courtesy of AgenaAstro.comMay 30, 2014
A necessity for WO GT81/GTF81Pros:
Lightweight,Easy to Use,Strong Construction,AccurateCons: Comments:
WO GTF81 doesn't have enough back travel for visual observation on its own, so a diagonal or quite long extension is necessary. Bevel on OTA side makes for secure attachment. Looks good too.
This review was provided courtesy of AgenaAstro.com
- Skill Level
- Time with Product
Dec 6, 2013
- User Notes:
- Review by CoosmicLugNut of SW Indiana.
Lightweight,Accurate,Easy to Use,Strong ConstructionCons:
The big, knurled thumbscrews are easy to turn even with gloves on. I find the WO 2" Dura-Bright Diagonal design quite elegant and the precise machining guarantees constant alignment. Internal anti-reflection baffling guarantees the highest contrast possible and most importantly the impressive WO Dura-Bright Diagonal looks great on my grab and go rich field ST80 Achromat. I was so impressed with the fit and finish I bought a second one for my Omni XLT120. WO has delivered an excellent 2-inch diagonal at a price point everyone should be able to afford.
This review was provided courtesy of AgenaAstro.comSort by