Adapters

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  1. Baader - Spacer Tube 39mm for 3" RT Steeltrack, with 4" Dovetail

    $69.00
    SKU: FOC-SPCR

    Ships in 3-5 Days

    The 3" RT Spacer allows changing back-focus by providing quick connect/disconnect spacing of the 3" RT Steeltrack Focuser (39mm spacing length).4" External Dovetail on one side for attachment of 3" RT Steeltrack Focuser
  2. JMI - Extension Tube 1.25 " dia. x 1.6 " ht

    $55.00
    SKU: JMI-ADPT1EXT

    Ships in 3-5 Days

    Extends the range of low-profile focusers. 1.25″ diameter x 1
  3. JMI - Extension Tube 2 " dia. x 1.5 " ht

    $59.00
    SKU: JMI-ADPT2EXT

    Ships in 3-5 Days

    Extends the range of low-profile focusers. 2″ diameter x 1
  4. JMI - Extension Tube 2 " dia. x 2.5 " ht

    $69.00
    SKU: JMI-ADPT2EXTL

    Ships in 3-5 Days

    Extends the range of low-profile focusers. 2″ diameter x 2
  5. JMI - 2 " Enhanced Extension Tube (2.13 ")

    $85.00
    SKU: JMI-ADPT2X2.1E

    Ships in 3-5 Days

    Enhanced extension tubes include a compression ring and 48mm filter threads. 2" diameter x 2.13" height

  6. JMI - 2 " Enhanced Extension Tube (2.63 ")

    $89.00
    SKU: JMI-ADPT2X2.6E

    Ships in 3-5 Days

    Enhanced extension tubes include a compression ring and 48mm filter threads. See the Adapter Comparison Chart.2" diameter x 2
  7. Optec - AP2.7 x 24tpi Extension Tube Set, 4-piece.

    $115.00
    SKU: OPT-19880

    Ships in 3-5 Days

    Provides ¼” incremental extensions from ½” to 3-¼” Includes ½”, ¾”, 1”, and 1- ½” extensions (#19891 through #19894)AP2
  8. Optec - AP2.7 x 24tpi Extension Tube Set, 5-piece.

    $150.00
    SKU: OPT-19881

    Ships in 3-5 Days

    Includes ½”, ¾”, 1”, 1- ½”, and 3” extensions (#19891 through #19895)AP2
  9. Optec - AP2.7 x 24tpi Extension Tube, 1/2" length.

    $30.00
    SKU: OPT-19882

    Ships in 3-5 Days

    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
  10. 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
  11. 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
  12. 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
  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. 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.

  15. 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
  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.
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