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Celestron Deluxe Tele-Extender

B&H # CETED Mfr # 93643
In Stock
Free Expedited Shipping
You Pay: $53.36
Product Highlights
  • For Eyepiece Projection Imaging
  • For 5-14" Celestron Cassegrains
  • For 7" & Larger Meade Cassegrains
  • Requires Celestron Visual Back
  • Requires an Eyepiece
  • Requires a Camera-Specific T-Mount

The Celestron Deluxe Tele-Extender for Schmidt-Cassegrain telescopes is a hollow tube that attaches to a telescope with an eyepiece installed, allowing photography of very small objects such as the moon and planets.  By using the Deluxe Tele-Extender in combination with an eyepiece, you can increase your instrument's effective focal length to well over 10,000mm!  And this corresponds with a matching increase in image size.  This technique is known as eyepiece projection photography.  The following formula can be used to determine approximate effective focal length:
Effective focal length = Telescope focal length/Eyepiece focal length x DF(the distance from the center of the eyepiece to the film)

The Deluxe Tele-Extender is used for high-power lunar, solar and planetary photography as well as for extreme terrestrial photography.  It fits over a 1.25" eyepiece up to 41mm thick and connects to the visual back of the telescope.  Optional counterweights will be necessary to properly balance the telescope when using the Tele-Extender. Please note that Celestron's visual back, #93653-A, is required in all cases.

To use the Deluxe Tele-Extender, remove the diagonal from your telescope and insert an eyepiece directly into the visual back.  Place the Tele-Extender over both the eyepiece and the visual back, then attach your 35mm SLR camera to the back of the Tele-Extender using your camera system's specific T-mount.  The Tele-Extender's built-in safety device will help prevent your eyepiece from becoming accidentally dislodged.

There are a few things to bear in mind when using a Tele-Extender.  First, the image seen through your camera's viewfinder will be upside down.  Second, due to the extremely high magnifying effect afforded by this accessory, extra care to prevent camera and telescope vibration, accurate polar alignment and use under good seeing conditions will all assist you in capturing high quality images.

Accepts 1.25" eyepieces of up to 41mm diameter
Celestron's visual back is required (supplied standard with Celestron scopes, and a required option when using upon Meade telescopes)
Celestron Deluxe Tele-Extender
  • 1-Year Warranty
  • T-Mounts

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    Required item: A T-Mount adapter is required to use this product.

    Celestron -  T-Mount SLR Camera Adapter for Canon EOS
    • You Pay: $7.99
    Vello -  Lens Mount Adapter - T Mount Lens to Canon EOS Camera
    • You Pay: $8.75

    Eyepieces, Lenses & Diagonals

    Celestron -  X-Cel LX 25mm Eyepiece (1.25")
    • You Pay: $59.95
    Celestron -  X-Cel LX 18mm Eyepiece (1.25")
    • You Pay: $59.95

    System Extensions

    Celestron -  Vibration Suppression Pads (useful at high power when near cars, etc.)
    • You Pay: $39.39

    Filter Thread Adapters

    Celestron -  Visual Back (1.25")
    • You Pay: $24.99

    Books & Tutorials

    Amherst Media -  Book: Heavenly Bodies: The Photographer's Guide to Astrophotography
    • Reg. Price: $26.95
    • Instant Savings: -$10.00
    • You Pay: $16.95
    • Limited supply at this price
    Amherst Media -  Book: Backyard Astronomer's Guide
    • You Pay: $44.95
    Usually ships in 7-14 business days i This is a Special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment. Item is non-cancelable and non-returnable.
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