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Extension Tubes

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

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

    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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    Model#: SFE-M42-V
    $29.00

  2. Explore Scientific - Rack and Pinion Focuser 1" Extension Tube

    Explore Scientific - Rack and Pinion Focuser 1" Extension Tube

    1" Extension tube for Explore Scientific Rack and Pinion focusers.

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    Model#: ESRPEXT1
    $18.99

  3. T2-29

    Baader Planetarium - T-2/M48 Expanding Ring

    Baader T-2 Female to M48 Male Expanding Ring # T2-29 2458110

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    Model#: T2-29
    $30.00

  4. TeleVue - Eyeguard Extender - Twist-on Style*

    TeleVue - Eyeguard Extender - Twist-on Style*

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    Model#: EGE-0020
    5% off

    Regular Price: $45.00

    Special Price: $42.75

  5. Explore Scientific - 5x Focal Extender 1.25" Barrel - 4 Elements

    Explore Scientific - 5x Focal Extender 1.25" Barrel - 4 Elements

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

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    Model#: FE05-125

    Regular Price: $149.99

    Special Price: $119.99

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

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

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

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    Model#: FE02-125

    Regular Price: $99.99

    Special Price: $79.99

  7. 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#: 05125
    $31.99

  8. iOptron - iEQ45 Extension Bar

    iOptron - iEQ45 Extension Bar

    This is the extension bar for the iEQ45. This attaches to the original bar and will create more counterbalance weight. ... Learn More
    Model#: 8026
    $48.00

  9. Vixen - Extension Tube R200SS

    Vixen - Extension Tube R200SS

    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

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    Model#: 2961
    $15.95

  10. Vixen - Extension Tube 43mm

    Vixen - Extension Tube 43mm

    Enhances the ability to perform astrophotography for many telescopes needing more back-focus, by moving the film plane back up to a maximum of 40mm.

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    Model#: 2957
    $15.95

  11. TeleVue - 3.5" Long Extension*

    TeleVue - 3.5" Long Extension*

    Includes brass clamp ring

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    Model#: X3C-0009
    5% off

    Regular Price: $75.00

    Special Price: $71.25

  12. TeleVue 2" Long Extension

    TeleVue - 2" Long Extension*

    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.

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    Model#: X2C-0008
    5% off

    Regular Price: $75.00

    Special Price: $71.25

  13. TeleVue - 2" Eyepiece Barrel Extender

    TeleVue - 2" Eyepiece Barrel Extender

    Reduces focuser travel with 55 Plossl. Includes filter threads

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    Model#: EBX-2120

    Regular Price: $40.00

    Special Price: $38.00

  14. Explore Scientific - Rack and Pinion Focuser 2" Extension Tube

    Explore Scientific - Rack and Pinion Focuser 2" Extension Tube

    2" Extension tube for Explore Scientific Rack and Pinion focusers.

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    Model#: ESRPEXT2
    $21.99

  15. Takahashi Extender-QE 1.6x 2" Field Flattener

    Takahashi - Extender-QE 1.6x 2" Field Flattener

    Created specifically for use with the new Takahashi FSQ-106ED “New Q" refractor , the Takahashi Extender - TSQ0106QE acts as both a 1.6X magnification visual barlow and a photographic tele-extender that flattens the field.

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    (48 States)
    Model#: TSQ0106QE
    $599.00

  16. Stellarvue 42mm Extension Tube - 30mm Length

    Stellarvue - 42mm Extension Tube - 30mm Length

    This is a 42 mm extension tube that adds 30 mm of length. The outside diameter is 1.8". The male thread is just over 3 mm long and the female thread is about 27.6 mm deep.

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    Model#: SFE-M42-030
    $19.00

  17. Stellarvue 42mm Extension Tube - 20mm Length

    Stellarvue - 42mm Extension Tube - 20mm Length

    This is a 42 mm extension tube that adds 20 mm of length. The outside diameter is 1.8". The male thread is just under 3 mm long and the female thread is about 18.5 mm deep.

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    Model#: SFE-M42-020
    $19.00

  18. Stellarvue 42mm Extension Tube - 10mm Length

    Stellarvue - 42mm Extension Tube - 10mm Length

    This is a 42 mm extension tube that adds 10 mm of length. The outside diameter is 1.8". The male thread is just under 3 mm long and the female thread is about 8.4 mm deep.

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    Model#: SFE-M42-010
    $19.00

  19. Stellarvue - 42mm Extension Tube - 5mm Long

    Stellarvue - 42mm Extension Tube - 5mm Long

    This is a 42 mm extension tube that adds 5 mm of length. The outside diameter is 1.8". The male thread is just under 3 mm long and the female thread is about 4.5 mm deep.

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    Model#: SFE-M42-005
    $19.00

  20. Stellarvue 2" Extension Tube - Extends 4.75"

    Stellarvue - 2" Extension Tube - Extends 4.75"

    Provides an additional 4,75” of  back focus. The 2” receptacle is 1.6” deep so if the item you are inserting is longer than 1.6”, add the difference to 4.75” to determine the actual amount of extension.

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    Model#: ET475
    $49.00

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