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William Optics SCT Thread Adapter for 2" Diagonal
| Brand | William Optics |
| Part Number | D-SCT-TA |
| Availability | available |
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Product Info
Manufacturer Description
William Optics' SCT adapter will let you convert compatible push-in (refractor) type diagonals into a standard SCT diagonal without committing extra funds to a brand-new diagonal. With compatible diagonals, you simply unscrew the 2" nosepiece from the diagonal body, and screw this adapter on instead.
This adapter has a standard SCT female thread (2", 24 TPI) on one side to connect to the male SCT thread on the rear of your telescope. The other side has a standard 48mm (M48 x 0.75) male thread, which is the same thread used on most 2" filters, eyepiece/diagonal barrels, etc. This item consists of two coupled adapters that permit you to rotate your SCT diagonal to the desired orientation on your telescope.
This adapter will work with the following diagonals:
- Our current stock of the William Optics 2" Dielectric Refractor diagonal (Carbon Fiber or Aluminum models)
- Our current stock of the William Optics 2" Quartz Refractor diagonal
- Our current stock of the William Optics 2" 90-deg Erecting Prism diagonal
- Our current stock of the William Optics 2" 45-deg Erecting Prism diagonal
- Our current stock of the William Optics 2" Dura Bright diagonal (2014 model and later only; will NOT work with Dura Bright diagonals sold prior to Aug 2013)
- Celestron XLT 2" SCT diagonal # 93527
This adapter will not work directly with the following diagonals:
- William Optics Dura-Bright diagonal (sold prior to Aug 2013)
- Most other diagonals not mentioned above
If you have an older William Optics diagonal (including the standard dielectric, carbon fiber, quartz, or erecting prism versions), this adapter may not - in fact, will probably not - work as William Optics has modified their threads over the years.
There is no standardization in the astronomy industry for the threads used on diagonal bodies. Hence, do not assume that this adapter will work with your diagonal. Please check the thread on your diagonal body before ordering this item - we do not have compatibility information for all the diagonals out there. An easy way to do this is to unscrew your 2" diagonal nosepiece and try threading on a standard 2" filter. If the filter threads on, so will this adapter. If your diagonal is incompatible with this adapter, one option (pointed out by one of the reviewers of this product) you can consider is to screw the adapter on to the 2" barrel on the diagonal, and not on the diagonal body itself.
Additional Specifications:
- Total length = 27mm / 1.06"
- Length of male M48 thread (including shoulder) = 4.8mm / 0.19"
- Clear aperture (inside diameter) = 41mm / 1.61"
- Maximum outside diameter = 60mm / 2.36"
Reviews
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Nov 12, 2018
Great SCT to 2”
Pros: Cons: Comments:This adapter minimizes back focus added to the optical path. I purchased this to attach to Orion’s 2” dielectric diagonal directly to the back of my 150mm MAK. This adapter also allowed me to add a focal reducer without having any focusing issues. I highly recommend it!
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Feb 18, 2018Williams Optical SCT to 48mm adapter
Pros: Cons: Comments:Beautifully made, even though it serves a simple function. Engages with 4 full revolutions, very strong.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Nov 21, 2017William Optics SCT Thread Adapter for 2" Diagonal
Pros: Cons: Comments:Nicely made, works well, and looks nice, too. Perfect fit on my diagonal and I would recommend this item for anyone looking to switch diagonal nose pieces.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Starman New Member
- Skill Level
- Unknown
- Time with Product
- Unknown
- User Notes:
- Review by Opticaljunkie of Melbourne.
Feb 4, 2016Fit the bill
Pros:Compact,Lightweight,Easy to Use,Strong Construction,Accurate
Cons: Comments:This was an adaptor I archaised for my SCT threaded scope..brilliant quality and great value AAA+++
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
CosmicLugNut Member
- Skill Level
- Unknown
- Time with Product
- Unknown
- User Notes:
- Review by Phaedrus of Southwest Indiana.
Feb 20, 2015A great value.
Pros:Easy to Use,Strong Construction
Cons: Comments:Another great value from Agena, this is a top quality adapter that allows me to use a two inch diagonal with my SCT scope.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Jan 25, 2014Perfect
Pros:Easy to Use,Lightweight,Accurate,Strong Construction,Compact
Cons: Comments:This allowed me to use my Williams diagonal on another non-SCT scope by simply switching the end piece.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Feb 8, 2013Fits like a glove
Pros:Easy to Use,Lightweight,Strong Construction,Compact,Accurate
Cons: Comments:Added this adapter to a Powerswitch Diagonal and it fit perfectly. Now I have the ability to use a 2" refractor style diagonal or (with this accessory) a SCT style diagonal.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Nov 30, 2012Eliminate the Meade Micro Focuser!!!
Pros:Compact,Strong Construction
Cons: Comments:The adapter allows you to screw the Meade series 5000 diagonal directly to the back of the Meade 7" LX200 SCT optical tube eliminating the micro focuser. It screws right onto the optical tube so you no longer need those to mess around with those pesky allen wrenches at 3:00 in the morning. This is perfect for me because I never use the auto focuser but I'm always forced to attach it any way. Because this adapter screws on, it has a much more solid feel, allowing me to attached my diagonal and binoviewer with complete confidence that it wont fall off while slewing.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Dec 18, 2010Excellent adapter
Pros:Compact,Accurate,Strong Construction
Cons:None
Comments:I purchased this adapter for my William Optics diagonal. Now, I can use this diagonal with my Celestron SCT or I screw back the slip adapter to use it on my Stellarvue refractor. What a convenience!!
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Dec 18, 2010Excellent adapter
Pros:Compact,Accurate
Cons:None
Comments:This excellent adapter allows me to use my 2" William Optics diagonal with my Celestron SCT or I screw back the slip adapter to use my diagonal with my Stellarvue refractor. Is like having two diagonals in one. Thanks Agena for providing great products.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Dec 5, 2010William Optics SCT Thread Adapter
Pros:Strong Construction
Cons:None
Comments:This adapter allows the William Optics 2" 45-deg Erecting Prism Diagonal to attach to an SCT type telescope. In my case it was an 8" Meade LX-200 telescope.
Bottom Line: Would you recommend this item? Yes
The 2" nose-piece from the Williams Optics Diagonal is removed (i.e. unscrewed) and replaced with this adapter. This effectively transforms the diagonal from a refractor type diagonal into an SCT type diagonal (i.e. which can be screwed onto the back of an SCT type telescope).This review was provided courtesy of AgenaAstro.com
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