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  • High Point High Point 35mm Extension Tube - 2" - EXT35
    $24.95 $22.45
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  • High Point High Point 50mm Extension Tube - 2" - EXT50
    $24.95 $22.45
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  • High Point High Point 80mm Extension Tube - 2" - EXT80
    $24.95 $22.45
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  • High Point High Point Extension Tube Kit 35mm - 50mm - 80mm - HPS-EXTKIT
    $59.95 $53.95
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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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  • BAD-SPCR-SET Spacer Set
    Baader Planetarium Baader Planetarium Spacer Set for MPCC - SPCR-SET
    $83.00
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  • Stellarvue Stellarvue 2" Extension Tube - 2.6" Long - ET003
    $49.00 $47.95
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  • Tele Vue Tele Vue 0.25" Length Accessory Tube for 2.4" - TLA-0250
    $29.95
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  • Tele Vue Tele Vue 0.375" Length Accessory Tube for 2.4" - TLB-0375
    $29.95
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  • Tele Vue Tele Vue 0.50" Length Accessory Tube for 2.4" - TLC-0500
    $29.95
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  • Tele Vue Tele Vue 1.0" Length Accessory Tube for 2.4" - TLD-1000
    $29.95
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  • Tele Vue Tele Vue 2" Long Extension Tube - X2C-0008
    $59.95
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  • Tele Vue Tele Vue 3.5" Extension Tube - X3C-0009
    $59.95
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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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  • 1mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 1 mm Spacer Ring for M48 Thread - SFE-M48-001
    $14.00
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  • 2mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 2 mm Spacer Ring for M48 Thread - SFE-M48-002
    $14.00
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  • 3mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 3 mm Spacer Ring for M48 Thread - SFE-M48-003
    $14.00
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  • 5mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 5 mm Spacer Ring for M48 Thread - SFE-M48-005
    $19.00
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  • 10mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 10 mm Spacer Ring for M48 Thread - SFE-M48-010
    $19.00
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  • 20mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 20 mm Spacer Ring for M48 Thread - SFE-M48-020
    $19.00
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  • 30mm Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 30 mm Spacer Ring for M48 Thread - SFE-M48-030
    $19.00
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  • Variable Spacer Ring for 48mm Thread
    Stellarvue Stellarvue 8 mm - 12 mm Variable Spacer Ring for M48 Thread - SFE-M48-V
    $29.00
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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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  • STE121
    Stellarvue Stellarvue 121mm Extension Tube for SV 2.5" Focuser - STE-M88.5-121
    $89.00 $85.95
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  • Stellarvue 55mm Extension for SV 2.5
    Stellarvue Stellarvue 55mm Extension Tube for SV 2.5" Focuser - STE-M88.5-055
    $69.00
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  • Stellarvue 60 mm Extension Tube for 3
    Stellarvue Stellarvue 60mm Extension Tube for FT 3" Focuser - STE-M109-060
    $129.00
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  • Stellarvue 42mm Extension Tube - 20mm High
    Stellarvue Stellarvue M42 Extension Tube Spacer - 20mm - SFE-M42-020
    $19.00
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  • Stellarvue M42 10 mm Spacer/Extension Tube
    Stellarvue Stellarvue M42 Extension Tube Spacer - 10mm - SFE-M42-010
    $19.00
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  • Stellarvue M42 5mm Spacer/Extension Tube
    Stellarvue Stellarvue M42 Extension Tube Spacer - 5mm - SFE-M42-005
    $19.00
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  • Stellarvue M42 1mm Spacer
    Stellarvue Stellarvue M42 Spacer - 1mm - SFE-M42-001
    $14.00
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  • Stellarvue 42mm Extension Tube - 30mm
    Stellarvue Stellarvue M42 Extension Tube Spacer - 30mm - SFE-M42-030
    $19.00
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  • Stellarvue Variable Spacer Ring for 42mm Thread
    Stellarvue Stellarvue 8 mm - 12 mm Variable Spacer Ring for M42 Thread - SFE-M42-V
    $29.00
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  • Tele Vue 1 mm Spacer for 2.4
    Tele Vue Tele Vue 1 mm Spacer for 2.4" Imaging Accessories - TLF-0040
    $12.00
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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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