The Questar #19107 is a mirror-type 90° viewing angle star diagonal for axial viewing with a 3.5" Questar telescope. It connects to the Cassegrain focus at the rear of the 3.5" Questar telescope control box by means of an optional #13071 swivel coupling. The diagonal uses a high reflectivity aluminized first-surface mirror and its 1.25" eyepiece holder is threaded to accept Questar eyepieces only.
Using the diagonal, in conjunction with a second eyepiece in the eyepiece holder on the top of the control box, allows you to switch between five different magnifications without having to change eyepieces – for example, the low power finderscope function through the standard low power top-mounted eyepiece, then the higher power finderscope function by flipping the built-in Barlow into the optical path, then normal low power view though the top-mounted eyepiece, then a medium power through the top-mounted eyepiece by flipping the built-in Barlow into place, and finally a high power eyepiece in the diagonal.
Shipping is free on this Questar item if it is purchased with a Questar scope that is being drop-shipped to you from the Questar factory. A special order freight charge of $9.95 and a 14-day or longer delivery time apply if this item is purchased by itself as a special order item. A $15 Questar drop-ship charge will apply if faster delivery is required and it must be drop-shipped to you from Questar.
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