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Starizona SCT 0.63x Corrector/Reducer IV


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  • Designed for 6/8/9.25/11/14" SCT Telescope designs.
  • Mechanical Backfocus: 90.3mm
  • Image Circle: 27mm
  • Made in USA
  • Find more specifications below.

Product Details

  • Focal Length

    The exact focal length of the reducer/telescope combo depends slightly on where in the optical path the SCT Corrector lens is placed. Nominally it will be within a few mm of the rear threads on the telescope. Changing this distance should only affect the focal length, not the optical quality. Listed below are the nominal focal lengths for the various sizes of Celestron SCTs*. The SCT Corrector works great on standard f/10 Meade SCTs as well, we just didn't have exact data for the nominal designs of those telescopes.

    Camera Adapters

    The SCT Corrector III has a nominal image circle of 27mm, accommodating most popular CCDs and DSLRs. For larger format cameras, check out our SCT Corrector LF. Because the backfocus of the SCT Corrector II is fairly critical, for best performance Starizona makes a variety of camera adapters, and custom adapters are also easy to make for less-common camera setups. The nominal backfocus is 90.3mm from the base of the threads on the camera side of the SCT Corrector II. For the largest compatible cameras, this should be kept within +/-2mm, while smaller format cameras may work fine at slightly larger tolerances. If we do not have the correct length or style adapter you need, we can gladly make the correct part to get the best performance from your setup. Please contact with any questions on making your camera configuration work.

    Telescope Adapters

    The SCT Corrector II, like the original SCT Corrector, has a 2" barrel that allows it to fit into a 2" visual back or 2" focuser. If your telescope does not have such an adapter, we recommend our Virtual View rotating visual back, which allows for easily changing the camera orientation without loosening any lock screws.

    C6 Specifications

    • Focal Ratio: f/8
    • Focal Length: 1220mm

    C8 Specifications

    • Focal Ratio: f/6.8
    • Focal Length: 1450mm

    C9.25 Specifications

    • Focal Ratio: f/6.3
    • Focal Length: 1490mm

    C11 Specifications

    • Focal Ratio: f/6.3
    • Focal Length: 1760mm

    C14 Specifications

    • Focal Ratio: f/6.7
    • Focal Length: 2365mm

    General Features

    • Image Circle: 27mm
    • Focal Reduction Factor: 0.63x
    • Barrel Size: 2"
    • Threaded for 48mm filters
    • SCT Corrector Top Thread: M42 x 0.75mm T-thread
    • Mechanical Backfocus: 90.3mm (3.56")
    • Fully multi-coated optics
    • Made in USA
  • included items

    • Starizona SCT 0.63x Corrector/Reducer IV

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