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Extension Tubes

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  1. Starlight Instruments - Riser, 2.0 " Diameter, adds 1.4 " to Height

    Starlight Instruments - Riser, 2.0 " Diameter, adds 1.4 " to Height

    Risers attach to the base of a focuser to 'lift' the entire focuser. Unless otherwise noted, the end of the riser which attaches to the OTA will be the same thread and diameter as the original focuser body.

    ...
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    Model#: R20-1.4

    Available

    $65.00

  2. Starlight Instruments - Riser, 2.0 " Diameter, adds 1.0 " to Height

    Starlight Instruments - Riser, 2.0 " Diameter, adds 1.0 " to Height

    Risers attach to the base of a focuser to 'lift' the entire focuser. Unless otherwise noted, the end of the riser which attaches to the OTA will be the same thread and diameter as the original focuser body.

    ...
    Learn More
    Model#: R20-1.0

    Available

    $65.00

  3. Starlight Instruments - Riser, 2.0 " Diameter, adds 0.65 " to Height

    Starlight Instruments - Riser, 2.0 " Diameter, adds 0.65 " to Height

    Riser, 2.0" Diameter, adds 0.65" to HeightRisers attach to the base of a focuser to 'lift' the entire focuser ... Learn More
    Model#: R20-0.65

    Available

    $60.00

  4. Shelyak Instruments - Short EP holder

    Shelyak Instruments - Short EP holder

    Short eyepiece holder for Lhires III ... Learn More
    Model#: BA0018

    $65.47

  5. Orion 1.25" Standard Tele-Extender

    Orion - 1.25" Standard Tele-Extender

    Orion tele-extenders permit high-magnification "eyepiece projection" photography of the Moon and planets with a Schmidt-Cassegrain telescope. Orion tele-extenders are designed to fit all Celestron and Meade Schmidt-Cassegrain telescopes.

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    Model#: ORI-05125

    Available

    $29.99

  6. Optec - AP2.7 x 24tpi Extension Tube, 3/4" length.

    Optec - AP2.7 x 24tpi Extension Tube, 3/4" length.

    AP2.7 Extension - 3/4" LengthOverall Height: 1.13" (28.7mm)Clear Aperture: 2.52" (64mm)Weight: 1.4 oz (40 g)Back-focus Usage: 0.75" (19 ... Learn More
    Model#: 19883

    $30.00

  7. Optec - AP2.7 x 24tpi Extension Tube, 3" length.

    Optec - AP2.7 x 24tpi Extension Tube, 3" length.

    AP2.7 Extension - 3" LengthOverall Height: 3.38" (85.8mm)Clear Aperture: 2.52" (64mm)Weight: 8.2 oz (230 g)Back-focus Usage: 3.00" (76 ... Learn More
    Model#: 19886

    $40.00

  8. Optec - AP2.7 x 24tpi Extension Tube, 1/2" length.

    Optec - AP2.7 x 24tpi Extension Tube, 1/2" length.

    AP2.7 Extension - 1/2" LengthOverall Height: 0.88"  (22.4mm)Clear Aperture: 2.52" (64mm)Weight: 1.0 oz (30 g)Back-focus Usage: 0.50" (12 ... Learn More
    Model#: 19882

    $30.00

  9. Optec - AP2.7 x 24tpi Extension Tube, 1-1/2" length.

    Optec - AP2.7 x 24tpi Extension Tube, 1-1/2" length.

    AP2.7 Extension - 1-1/2" LengthOverall Height: 1.87"  (47.5mm)Clear Aperture: 2.52" (64mm)Weight: 2.4 oz (70 g)Back-focus Usage: 1.50" (38 ... Learn More
    Model#: 19885

    $30.00

  10. Optec - AP2.7 x 24tpi Extension Tube, 1" length.

    Optec - AP2.7 x 24tpi Extension Tube, 1" length.

    AP2.7 Extension - 1" LengthOverall Height: 1.38" (35.0mm)Clear Aperture: 2.52" (64mm)Weight: 1.8 oz (55 g)Back-focus Usage: 1.00" (25 ... Learn More
    Model#: 19884

    $30.00

  11. Optec - AP2.7 x 24tpi Extension Tube Set, 5-piece.

    Optec - AP2.7 x 24tpi Extension Tube Set, 5-piece.

    Includes ½”, ¾”, 1”, 1- ½”, and 3” extensions (#19891 through #19895)AP2 ... Learn More
    Model#: 19881

    $150.00

  12. 19800

    Optec - AP2.7 x 24tpi Extension Tube Set, 4-piece.

    Provides ¼” incremental extensions from ½” to 3-¼” Includes ½”, ¾”, 1”, and 1- ½” extensions (#19891 through #19894)AP2 ... Learn More
    Model#: 19880

    Available

    $115.00

  13. Optec - AP2.7 knurled female threaded retaining ring, 1/10" thick.

    Optec - AP2.7 knurled female threaded retaining ring, 1/10" thick.

    AP2.7 Retaining RingOverall Height: 0.10" (2.5mm)Outside Diameter: 3.0" (88.9mm)Clear Aperture: 2.69" (68 mm)Weight: 0 ... Learn More
    Model#: 19888

    $15.00

  14. Optec - 2-" to 3"x 24 tpi male threaded mount.

    Optec - 2-" to 3"x 24 tpi male threaded mount.

    The 2-inch to 3-inch thread adapter was developed to easily adapt the Apogee and SBIG cameras and filters wheels for the TCF-S focuser.By holding tight tolerances (+/- 0.003") Optec has achieved a slip-fit that is second-to-none ... Learn More
    Model#: 17666

    $95.00

  15. Meade - APO Focuser-Sleeve Extension Tube

    Meade - APO Focuser-Sleeve Extension Tube

    Meade APO Focuser-Sleeve Extension Tube (50mm) 07364 can allow telescope with focus travel limitations to be used in terrestial observing ... Learn More
    Model#: MEA-07364

    Available

    $50.00

  16. Lumicon - 2in Thread-in Extension Tube with 2in Push-Back

    Lumicon - 2in Thread-in Extension Tube with 2in Push-Back

    The Lumicon 2in Threadin Extension Tube with 2in Eye Piece Push-Back threads into 2" eyepieces. Provides an extension range of the eyepiece from 0 to 2". Includes 2"/48mm filter threads ... Learn More
    Model#: LA1025

    Available

    $39.95

  17. Lumicon - 2in Dropin Extension Tube with 1in Push Back

    Lumicon - 2in Dropin Extension Tube with 1in Push Back

    The Lumicon 2in Dropin Extension Tube with 1in Eyepiece Push Back drops into 2" eyepiece holders and accepts 2" eyepieces & accessories. Moves the eyepiece a minimum of 1" back. Includes 2"/48mm filter threads ... Learn More
    Model#: LA1030

    In Stock

    $39.95

  18. Lumicon - 2 " Extension Tube 1.5 Push-Back Drop-in

    Lumicon - 2 " Extension Tube 1.5 Push-Back Drop-in

    The Lumicon 2 inch Drop-in Extension Tube, 1.6" Push-Back, drops into 2" eyepiece holders, and accepts 2" eyepieces & accessories. Provides a minimum extension of 1.6". Includes 2"/48mm filter threads ... Learn More
    Model#: LA1035

    Available

    $39.95

  19. Lumicon - 1.25" Thread-in Extension Tube with 1" Eyepiece Push-back

    Lumicon - 1.25" Thread-in Extension Tube with 1" Eyepiece Push-back

    The Lumicon 1.25in Threadin Extension Tube with 1in Eye Piece Push Back threads into 1.25" eyepieces and is for small focus extension. Provides extra reach of 0 to 1" ... Learn More
    Model#: LA1010

    Available

    $33.95

  20. Lumicon - 1.25" Dropin Extension Tube with 1" Eye Piece Push Back

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