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Celestron Deluxe Off-Axis Guider - Black - 93648 Gently Used


Gently Used - Good Condition!



· Most accurate way to guide – improved accuracy compared to using a separate guide scope

· 12.5mm multi-coated prism with aluminized backing for maximum reflectivity and illumination to the auto-guider

· Fixed-orientation helical focuser for easy, smooth and accurate auto-guider focus

· 48mm clear aperture supports full frame cameras without vignetting

· Includes adapters with the correct spacing for DSLR cameras, Nightscape CCD and other popular astro-imaging cameras

· Ideal for Schmidt- Cassegrain and EdgeHD telescopes

The Off-Axis Guider is an essential astro-imaging 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 astro-images with pinpoint round stars.

Off-Axis Guiders have been around for a long time, but typically pose three main challenges:

1.Finding a guide star from the far edges of the telescope's focal plane can be difficult, considering the small field of view and sometimes less-than-ideal illumination.

2.Getting both imaging camera and auto-guider to reach focus with one another is time consuming and sometimes requires experimentation.

3.Additional spacers and adapters are usually required for your particular camera, telescope, and auto-guider, which adds to cost and complexity.

Celestron's Off-Axis Guider addresses these challenges by:

1.Providing a large 12.5mm prism that can be adjusted to move closer to the center of the telescope's focal plane, depending on the size of the imaging camera. This results in brighter guide stars, with the help of the large prism to fully illuminate the auto-guider sensor.

2.Featuring a high-quality, fixed-orientation Helical focuser. This provides extremely smooth and accurate focus of the auto-guider without changing (or twisting) the auto-guider camera orientation.

3.Including all the needed spacers and adapters are included for most common imaging configurations, including DSLR cameras, Nightscape CCD cameras, and more. The following adapters are included: SCT/EdgeHD, female M48, female M42 (T-thread), male M48, male M42 (T-thread), 3 T-thread spacers

Additonal Specifications

  • 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
  • Weight: 18 oz (510 g)
  • Clear Aperture: 48mm (1.89 in)

(Gently used, very minor scratches on hard surfaces. Appears to be totally functional and in good condition.  Box has minor fraying around top edges.  Copy of instruction manual is included.)

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