Slip-fit adapter to use non-Questar eyepieces in older Questar 3.5" scopes


Availability: More on the way

This slip-fit adapter allows you to use smooth barrel non-Questar eyepieces in older Questar telescopes designed only to use threaded barrel Questar eyepieces . . .
Our Product #: 2740
TeleVue Product #: AQE-0005

Product Description

This machined aluminum adapter replaces the eyepiece holder tube on an older Questar telescope to allow you to use non-Questar eyepieces in your scope. Older Questar scopes only allow the use of thread-in Questar/Vernonscope Brandon eyepieces. There is no thumbscrew in the eyepiece holder tube of older scopes to hold smooth barrel non-Questar eyepieces in place. Current Questar scopes have an eyepiece holder similar to this piece. This unit can be used to replace a damaged current thumbscrew eyepiece holder as well as upgrade an older no-thumbscrew scope to the current design.

This adapter allows the use of smooth barrel non-Questar eyepieces, as well as threaded barrel Brandon eyepieces. In addition to a thumbscrew to hold eyepieces in place, it has the same rotating diopter adjustment as older and current Questar scopes that allows the eyepiece and finderscope to be made parfocal.

To install the adapter, the older non-thumbscrew tube is simply unthreaded from the scope body by grasping the tube body (not the black knurled rotating ring at the top of the tube) and the new adapter threaded into the scope in its place.

Tech Details

Warranty 1 year


Review by:
I recently received a 1971 3.5” Questar as a gift. It’s a beautiful scope that gives very sharp images, but is limited by the fact that you can only use the two stock, threaded, screw-in eyepieces. To enable use of my wider 1.25” eyepiece collection, I purchased this TeleVue slip fit adapter. Installation was simple and it does exactly what it’s supposed to. One possible improvement would be if the adapter had a brass compression ring fitting, as it only has the older style thumb screw clamping system. (Posted on 10/28/2019)
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