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In order for a large sensor guide camera to perform to its potential in an OAG, a prism large enough to allow illumination of the larger sensor is needed to avoid severe vignetting. The new QHYOAG-M Pro uses a wider prism to better accommodate larger sensor guide cameras. The prism size of the standard QHYOAG-M series is about 8 x 8mm, while QHYOAG-M Pro is 10 x 14mm.
The SkyWatcher 9×50 Finder to C Adapter connects C and CS mount cameras to SkyWatcher, Orion and most Celestron 8 x 50 & 9 x 50 straight through finders.
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The Celestron 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 astroimages with pinpoint round stars.
The Off-Axis Guider is an essential astro-imaging accessory for long focal length telescopes that require the most accurate guiding possible.
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