The Off-Axis Guider is an essential astroimaging accessory for long focal length telescopes that require the most accurate guiding possible. 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.
Off-Axis Guiders have been around for a long time, but typically pose three main challenges:
Celestron's Off-Axis Guider addresses these challenges by:
Helical Focuser Travel: 8mm
Telescope Connection: M42 T-thread, M48, and SCT/EdgeHD
Autoguider Connection: M42 T-thread, and standard 1.25" adapter
Camera Connection: M42 T-thread, and M48
|Name||Celestron - Off-Axis Guider|
|Custom Stock Status||Available - Ships in 3-5 Days|
Large prism. Double rotating device arrived back and forth. Smooth helicoid for guide CCD.M48 adapter for the camera. Very sturdy body.
I'm using the OAG with reducer. Can be adjusted out of the prism, so it has gained sufficient viewing. There is no need to look for guide star. The image of exposure 3 minutes to try to 20 sheets composite but never deviated 0.2 pixel. It is 1/20 of when using the guide telescope.
(Posted on 2/25/2015)