Celestron Off-Axis Guider

Celestron Off-Axis Guider

Celestron Off-Axis Guider

B&H # CEOAG MFR # 93648
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Product Highlights

  • Adjustable 12.5mm Prism
  • Fixed-Orientation Helical Focuser
  • Includes M42/M48 Adapters/Spacers
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Celestron 93648 overview

  • 1Description

The Off-Axis Guider from Celestron is an astrophotography accessory used to compensate for tracking errors and align the focal planes of an imaging camera and autoguider. The 12.5mm adjustable prism is capable of transmitting brighter guide stars by moving closer to the center of the telescope's focal plane (without entering the imaging camera's field of view), which is especially useful when using high-magnification optical tubes. A fixed-orientation helical focuser with 8mm travel distance enables precise focus adjustments without changing the autoguider camera alignment as well as eliminates time-consuming guess work when focusing an image onto the imaging camera and autoguider sensors. An included set of male/female adapters and spacers allows the Off-Axis Guider to be mounted with common telescope-camera configurations; including DSLRs, Nightscape CCD, and other popular astroimaging cameras.

Use and Handling
  • 48mm clear aperture
  • Helical focuser with 8mm travel distance for autoguider focus
  • Adjustable 12.5mm prism for brighter guide star alignment
  • Telescope: M42 T-thread, M48, SCT/EdgeHD
  • Autoguider: M42 T-thread, standard 1.25" tube
  • Imaging Camera: M42 T-thread, M48
Adapters and Spacers
  • M48 female adapter
  • M48 male adapter
  • M42 T-thread female adapter
  • M42 T-thread male adapter
  • Schmidt-Cassegrain/EdgeHD adapter
  • (3) T-thread spacers
UPC: 050234936484
In the Box
Celestron Off-Axis Guider
  • SCT/EdgeHD Adapter
  • M48 Female Adapter
  • M48 Male Adapter
  • M42 Female T-Thread Adapter
  • M42 Male T-Thread Adapter
  • 3 x T-Thread Spacers
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Celestron 93648 specs

    Aperture 48 mm
    Weight 18 oz (510 g)
    Packaging Infowuqeuzrueadayceadyvddf
    Package Weight 2.15 lb
    Box Dimensions (LxWxH) 8.0 x 7.9 x 4.3"

    Celestron 93648 reviews

    Off-Axis Guider is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from A brilliant piece of engineering One of the nice things about the Celestron off-axis guider is that it includes critical accessories for assembling it onto an SCT, namely the necessary spacers to achieve simultaneous focus of the imaging camera and guide camera as well as an SCT adapter for attaching the OAG onto the threads of an SCT adapter plate. The only extra part I needed to buy for this OAG was an adapter for connecting the OAG to my specific brand of filter wheel. I found a company that makes adapters for mating any brand of filter wheel with any brand of OAG so buying that adapter was simple. One needs to carefully note the instruction manual where it says that the OAG must be positioned with the flat side of the pick-off prism facing the telescope. That means that the user must pay close attention to which side of the OAG that the SCT adapter is screwed onto. Initially I screwed the SCT adapter onto the wrong side of the OAG and was dismayed when I saw nothing but blackness from my guide camera. A quick relocation of the SCT adapter onto the other side of the OAG solved that problem immediately. Another critical piece of engineering provided by Celestron is the provision of a helical focuser with 8mm of focus travel that enabled my autoguider camera to reach focus after I installed the included 11.55mm spacer between my imaging camera and the OAG. I believe that OAG's are one of the most complicated and rewarding accessories one can buy to enable long exposure astrophotos of nebulae and galaxies with very high quality tracking. I found that the Celestron Off Axis Guider design makes this complex device much easier to integrate onto one's specific imaging train configuration.
    Date published: 2015-04-14
    Rated 5 out of 5 by from A One Stop Solution to Astrophotography A well crafted tool for Astrophotography, offering a wide range of adapters. Easy to use, with up and going results in minutes of unboxing.
    Date published: 2013-12-26
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