Off-axis Guider Rare hard to find universal prism telescope camera

Off-axis Guider Rare hard to find universal prism telescope camera attachment.
Stated as used due to no box and the unit only. It has never hooked up to a telescope or camera
The Off-Axis Guider is an essential astroimaging accessory for long focal length telescopes that require the most accurate guiding possible.
The Off-Axis Guider uses a prism to intercept a small portion of the telescope’s focal plane (outside the field of view of the main imaging camera) to locate a guide star.
Any movement seen by the guide star will be the exact same movement seen by the imaging camera.
Guiding this way will correct for tracking errors, as well as opto-mechanical errors or flexure.
The result: better astro images with pinpoint round stars.
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