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Extension Tubes & Spacers

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  • High Point High Point 35mm Extension Tube - 2" - EXT35
    $24.95
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  • High Point High Point 50mm Extension Tube - 2" - EXT50
    $24.95
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  • High Point High Point 80mm Extension Tube - 2" - EXT80
    $24.95
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  • William Optics 2.25
    William Optics William Optics Extender for FLT 110 & 132 Telescopes - P-EXFLT
    $58.00
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  • High Point High Point Extension Tube Kit 35mm - 50mm - 80mm - HPS-EXTKIT
    $59.95
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  • BAD-SPCR-SET Spacer Set
    Baader Planetarium Baader Planetarium Spacer Set for MPCC - SPCR-SET
    $83.00
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  • Baader Planetarium M68 20 mm Extension Tube
    Baader Planetarium Baader M68 Extension Tube - 20 mm Long - M68/20
    $69.00
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  • Baader Planetarium M68 40 mm Extension Tube
    Baader Planetarium Baader M68 Extension Tube - 40 mm Long - M68/40
    $73.00
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  • Baader Varilock 46
    Baader Planetarium Baader VariLock 46 T2 Variable Extension Tube - 29 mm - 46 mm - T2-25V
    $79.00
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  • Baader Varilock 29 Components
    Baader Planetarium Baader VariLock 29 T2 Variable Extension Tube - 20 mm - 29 mm -- T2-25Y
    $75.00
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  • Baader T2- 33 Adapter
    Baader Planetarium Baader T2 Variable Extension and Lock Ring Set - T2-33
    $54.00
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  • Baader Ring Spacer Set - T2RING
    Baader Planetarium Baader T2 Delrin Spacer Ring Set - 15 Pieces - T2RING
    $17.00
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  • Baader T2-25A (laying down) & 25C (leaning)
    Baader Planetarium Baader 15 mm T-2 Extension Tube - T2-25A
    $23.00
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  • Baader T2-25A (laying down) & 25C (leaning)
    Baader Planetarium Baader 7.5 mm T-2 Extension Tube - T2-25C
    $21.00
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  • Baader T2-25B - 40 mm T2 Extension Tube
    Baader Planetarium Baader 40 mm T-2 Extension Tube - T2-25B
    $25.00
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  • High Point High Point 25mm Extension Tube for GSO 6" & 8" RC - RC825
    $24.95
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  • High Point High Point 25mm Extension Tube for GSO 10" RC - RC1025
    $29.95
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  • High Point High Point 50mm Extension Tube for GSO 10" RC - RC1050
    $29.95
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  • High Point High Point 35mm Extension Tube - 1.25" - EXT35-1
    $19.95
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  • High Point High Point 35mm Self-Centering Extension Tube - 2" - SCEXT35-2
    $32.95
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  • High Point High Point 50mm Self-Centering Extension Tube - 2" - SCEXT50-2
    $32.95
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  • High Point High Point 80mm Self-Centering Extension Tube - 2" - SCEXT80-2
    $32.95
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  • High Point High Point 5mm Spacer Ring for M42 Thread - M425
    $15.95
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  • High Point High Point 10mm Spacer Ring for M42 Thread - M4210
    $15.95
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  • High Point High Point 20mm Spacer Ring for M42 Thread - M4220
    $15.95
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  • High Point High Point 30mm Spacer Ring for M42 Thread - M4230
    $15.95
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  • High Point High Point 5mm Spacer Ring for M48 Thread - M485
    $15.95
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  • High Point High Point 10mm Spacer Ring for M48 Thread - M4810
    $15.95
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  • High Point High Point 20mm Spacer Ring for M48 Thread - M4820
    $15.95
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  • High Point High Point 30mm Spacer Ring for M48 Thread - M4830
    $15.95
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  • Baader 10 mm M68 Extension Tube
    Baader Planetarium Baader Planetarium 10 mm M68 Extension Tube - M68/10
    $64.00
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  • Baader 100 mm M68 Extension Tube
    Baader Planetarium Baader Planetarium 100 mm M68 Extension Tube - M68/100
    $125.00
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  • Baader 60 mm M68 Extension Tube
    Baader Planetarium Baader Planetarium 60 mm M68 Extension Tube - M68/60
    $97.00
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  • Baader 80 mm M68 Extension Tube
    Baader Planetarium Baader Planetarium 80 mm M68 Extension Tube - M68/80
    $111.00
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  • Baader Planetarium M48 Spacer Ring for MPCC Mark III Coma Corrector to Canon EOS T-Mount
    Baader Planetarium Baader Planetarium M48 Spacer Ring for MPCC Mark III Coma Corrector to Canon EOS T-Ring - MPCC-SPCR
    $24.00
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  • Baader Planetarium 2
    Baader Planetarium Baader Planetarium 2" NexStar4 to SCT Extension Ring - NX4-SC
    $35.00
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  • Baader 15 mm UFC S70 Extension Tube
    Baader Planetarium Baader Planetarium 15 mm UFC S70 Extension - UFC-XT15
    $38.00
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  • Baader UFC S70 Extension Tube - 40 mm
    Baader Planetarium Baader Planetarium 40 mm UFC S70 Extension - UFC-XT40
    $47.00
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  • Baader 5 mm UFC S70 Extension Tube
    Baader Planetarium Baader Planetarium 5 mm UFC S70 Extension - UFC-XT5
    $31.00
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  • Baader Planetarium UFC S70 Varilock 15-20 mm Extension Tube
    Baader Planetarium Baader Planetarium 15-20 mm UFC S70 Varilock Extension - UFC-XV
    $121.00
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Extension tubes are simple yet essential accessories for astrophotography. Extension tubes and spacers add more travel to your imaging train so your system can come into focus. Many telescopes are limited in back focus. This can create coma or produce images that are blurred. By extending the length of your imaging train, you will notice improved images, showing surface details, pinpoint stars, and much more. Moreover, extension tubes are also used for visual observations. When observing through an eyepiece, extension tubes can provide the same additional back focus for crisp, sharp views.


Spacers function the same way as well. These much smaller rings add several millimeters of space between your field lens and your eyepiece or camera. Although spacers can be used for visual astronomy, spacers are primarily used for astrophotography. This is because camera sensors are often extremely sensitive and require a precise length of back focus in order to achieve optimal image quality. Spacers can be a small as 1mm and go up to 30mm thick.


At High Point Scientific, we offer a wide selection of spacers and extension tubes to choose from. We work with the best brands in the industry to bring you astrophotography accessories at affordable prices. You will find extension tubes from brands you know and love, such as Tele Vue, Baader, Takahashi, Stellarvue, and William Optics among many others. Our astrophotography experts are standing by to help you find the accessories that are right for you!

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