Extension Tubes

Showing 1 to 20 of 71 total
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  1. Astrodon - 1.25" Eyepiece Extender

    $28.00
    SKU: ADO-MOAG-EYE

    Ships in 3-5 Days

    This eyepiece extension is designed to work with all Astrodon Manual Off-Axis Guiders, or MOAG's.

  2. Vixen - Extension Tube R200SS

    Regular Price: $15.95

    You Pay: $14.36

    SKU: 2961

    In stock

    Adds 20mm of length to the R200SS Optical tube and allows attachment of a 42mm T thread to 43mm accessory. This is customarily used with optional item number 3523 for eyepiece projection photography.

  3. TeleVue - 3.5" Long Extension*

    Regular Price: $65.00

    You Pay: $58.95

    SKU: TEL-X3C-0009

    In stock

    The TeleVue 3.5" extension tube includes brass clamp ring

  4. Tele Vue - 2" Extension Tube for 2" Focusers

    Regular Price: $65.00

    You Pay: $58.95

    SKU: TEL-X2C-0008

    In stock

    The TeleVue Extension Tube - X2C-0008 provides an additional 2" of focuser travel length which can sometimes be necessary when doing photography through many scopes - particularly when the 2" diagonal is removed.

  5. TeleVue - 2" Eyepiece Barrel Extender

    Regular Price: $30.00

    You Pay: $28.95

    SKU: TEL-EBX-2120

    In stock

    Reduces focuser travel with 55 Plossl. Includes filter threads

  6. Takahashi - 2" Extension Tube

    $163.00
    SKU: TAK-TKP31112

    In stock

    This 2" extension tube by Takahashi is compatible with the TOA-130.

  7. Starlight Instruments - Riser, 2.0 " Diamter, adds 2.75 " to Height

    $75.00
    SKU: R20-2.75

    Ships in 3-5 Days

    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.

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

    $65.00
    SKU: R20-1.4

    Ships in 3-5 Days

    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.

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

    $65.00
    SKU: R20-1.0

    Ships in 3-5 Days

    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.

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

    $60.00
    SKU: R20-0.65

    Ships in 3-5 Days

    Riser, 2.0" Diameter, adds 0.65" to HeightRisers attach to the base of a focuser to 'lift' the entire focuser
  11. Starlight Instruments - Riser, 2.0 " Diameter, adds 3.75 " to Height

    $85.00
    SKU: R20-3.75

    Ships in 3-5 Days

    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.

  12. Shelyak - Short EP holder

    $65.47
    SKU: SHE-BA0018

    Ships in 7-10 Days

    Short eyepiece holder for Lhires III
  13. Optec - AP2.7 knurled female threaded retaining ring, 1/10" thick.

    $15.00
    SKU: OPT-19888

    Ships in 3-5 Days

    AP2.7 Retaining RingOverall Height: 0.10" (2.5mm)Outside Diameter: 3.0" (88.9mm)Clear Aperture: 2.69" (68 mm)Weight: 0
  14. Optec - AP2.7 x 24tpi Extension Tube, 3" length.

    $40.00
    SKU: OPT-19886

    Ships in 3-5 Days

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

    $30.00
    SKU: OPT-19885

    Ships in 3-5 Days

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

    $30.00
    SKU: OPT-19884

    Ships in 3-5 Days

    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
  17. iOptron - iEQ45 Extension Bar

    $48.00
    SKU: IOP-8026

    Ships in 3-5 Days

    This is the extension bar for the iEQ45. This attaches to the original bar and will create more counterbalance weight.
  18. Orion - 1.25" Standard Tele-Extender

    $29.99
    SKU: ORI-05125

    In stock

    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.

  19. Explore Scientific - 2x Focal Extender 1.25" Barrel - 4 Elements

    $109.99
    SKU: EXP-FE02-125

    In stock

    Provides excellent control of chromatic and spherical aberration, and a flatter field-of-view compared to standard barlows.

  20. Stellarvue - 42mm Variable Extension Tube - 8 - 12mm Length

    $29.00
    SKU: STV-SFE-M42-V

    Available - Typically ships in 1-3 Days

    This is an adjustable 42 mm extension tube that adds 8-12 mm of length. Thread is the standard 1.8" filter thread size of M42 X .75.

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