We are now COMPLETELY sold out of all Solar Eclipse items!

Important Notice
regarding the authenticity and safety of Baader, Thousand Oaks, and other solar products sold by AgenaAstro.  Please click here.

William Optics 2" RotoLock Eyepiece Adapter Upgrade for 2" WO Diagonals # D-ROTO-A2

Our Price: $89.00
Free shipping for this item in the US Click here for more info

Continental US Customers:
All items we sell ship for free within the Continental US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

In Stock (1 Available)
Ships by Next Business Day
Our Product ID: PAAR-WO-ROTO-A2
Manufacturer SKU: D-ROTO-A2
Item Can Ship: Worldwide
William Optics 2" RotoLock Eyepiece Adapter Upgrade for 2" WO Diagonals # D-ROTO-A2

More Views

  • William Optics 2" RotoLock Eyepiece Adapter Upgrade for 2" WO Diagonals # D-ROTO-A2
  • William Optics 2" RotoLock Eyepiece Adapter Upgrade for 2" WO Diagonals # D-ROTO-A2

Product Details

New from William Optics - 2" RotoLock Eyepiece Adapter Upgrade for most 2" William Optics Diagonals # D-ROTO-A2

The new RotoLock series of adapters from William Optics may well set the "gold' standard for visual backs and eyepiece adapters in the astronomy industry! Thoughtfully designed, exquisitely machined, and artfully presented, these adapters provide a very convenient and robust method to attach eyepieces and accessories to your telescope.

Just rotate the golden grip ring clockwise to lock any inserted accessory, or counter-clockwise to release the accessory. Innovative design ensures that you get a very solid hold and the accessory is perfectly centered every time. No thumbscrews to worry about! The internal ball bearings and detents that click every few degrees make this adapter a joy to use. The large, knurled grip ring is easy to grasp with gloves on as well.

This WO adapter # D-ROTO-A2 has a 2" eyepiece holder on one side and a special dovetail ring on the other side. This item can be used to upgrade most 2" William Optics diagonals that have a standard eyepiece holder with thumbscrews to a RotoLock diagonal.

Please note that this item:

  • Cannot be used with 1.25" or hybrid William Optics diagonals, or diagonals from other manufacturers
  • Requires you to open up significant parts of your 2" diagonal in order to perform this upgrade. Although this is straightforward, no instructions are included with the adapter. However, William Optics has put together a sequence of photos at this link showing how this is to be done. Tools required for this upgrade are not included, and neither is the 1.25" RotoLock adapter shown in some of the photos in the preceeding link.


  • 2" eyepiece holder insertion depth = Xmm
  • Total length = 49mm
  • Maximum diameter = 75mm
  • Weight = Xoz. / 150g