Questar 45° Image Erecting Prism for Questar 3.5" Scopes Only

This premium Questar 45° viewing angle image erecting diagonal fits into the back of any Questar 3.5" scope to provide upright and correctly left-to-right oriented images.The normal image in the eyepiece of a Questar 3.5" astronomical telescope or spotting scope is an upright but mirror image (reversed right-for-left). A mirror image is of little consequence in astronomical and terrestrial viewing of relatively stationary subjects (a deer is still a deer whether he's facing left or right). However, a mirror image can be disconcerting if you are trying to read printing (the name or home port on a distant boat, for example), or if you are trying to follow quickly or erratically moving wildlife.

This premium 45° viewing angle image erecting diagonal fits into the back of a Questar scope (using an optional #19431-03 slip-fit adapter) to provide upright and correctly left-to-right oriented images with any 1.25" eyepiece. In addition to correctly-oriented images, it provides what many observers feel is a more comfortable 45° terrestrial viewing angle. It increases the magnification by approximately 8%.

The diagonal is exceptionally well made. Its precision image-erecting Amici (or roof) prism is made of costly BaK-4 glass and is fully multicoated for high light transmission. A non-marring brass compression ring with a thumbscrew holds any brand of 1.25" eyepieces firmly in place, including Questar's thread-in Brandon eyepieces.

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. If this item is being purchased by itself as a special order item, a $12.95 freight charge and a 14-day or longer delivery time will apply. The $12.95 freight and a $20 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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