Save up to $300 on ZWO AM5 and AM3 mount packages while supplies last!Save up to $300 on ZWO AM5 and AM3 mount packages while supplies last!

 ECLIPSE ORDERS: New orders will not ship in time. Local pickup orders can be ordered until 1pm PT Sat, Apr 6 and picked up by 2pm. 

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  1. Pegasus Astro 12V/10A DC Power Supply Unit: 2.1mm Connector Plug for PPB and Other Items (Not for UPB/UPB2)
    Pegasus Astro 12V/10A DC Power Supply Unit: 2.1mm Connector Plug for PPB and Other Items (No...
    Our Price: $74.41
    In Stock
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  2. Discontinued
    ZWO ASI178MM Monochrome Astronomy Camera Kit # ASI178MM-KIT1
    ZWO ASI178MM Monochrome Astronomy Camera Kit # ASI178MM-KIT1
    Our Price: $537.00
    Out of Stock
    Free US Shipping
  3. Baader 1.25" Click-Lock Eyepiece Adapter/Visual Back with T-2 Thread # T2-08 2458100
    Baader 1.25" Click-Lock Eyepiece Adapter/Visual Back with T-2 Thread # T2-08 2458100
    Our Price: $97.00
    In Stock
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  4. ZWO 7-Position Electronic Filter Wheel for 36mm Unmounted Filters (Version II) # EFW7-36-II
    ZWO 7-Position Electronic Filter Wheel for 36mm Unmounted Filters (Version II) # EFW7-36-II
    Our Price: $299.00
    In Stock
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  5. Blue Fireball T Thread Spacer Ring with 3mm Extension # S-T3
    Blue Fireball T Thread Spacer Ring with 3mm Extension # S-T3
    Our Price: $13.95
    In Stock
    Free US Shipping Over $25
  6. Rigel Systems Aviation / Astronomy FlashLight - Skylite
    Rigel Systems Aviation / Astronomy FlashLight - Skylite
    Our Price: $39.95
    In Stock
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  7. ZWO T2-1.25" Filter Adapter # T2-1.25-3
    ZWO T2-1.25" Filter Adapter # T2-1.25-3
    Our Price: $17.00
    In Stock
    Free US Shipping Over $25
  8. Agena V Series Vixen-Style Universal Dovetail Bar - 180mm (7.1") Length # VR-180A
    Agena V Series Vixen-Style Universal Dovetail Bar - 180mm (7.1") Length # VR-180A
    Our Price: $40.00
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  9. Baader T2 Extension Tube - 7.5mm # T2-25C 1508155
    Baader T2 Extension Tube - 7.5mm # T2-25C 1508155
    Our Price: $25.00
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  10. GSO 2" Crayford Focuser for Reflectors - Dual Speed
    GSO 2" Crayford Focuser for Reflectors - Dual Speed
    $150.00
    Out of Stock
    More Info
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  11. ZWO M54 Male Thread to M48 Female Thread Low Profile Adapter for ZWO 2" EFW or M54 Filter Drawer # M54M-M48F-2
    ZWO M54 Male Thread to M48 Female Thread Low Profile Adapter for ZWO 2" EFW or M54 Filter Dr...
    Our Price: $13.00
    In Stock
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  12. Pegasus Astro PPBA/PPB-Micro/UPB Cable for Sky Watcher EQ6-R, AZ-EQ6, EQ8-R, EQ8-RH & Pegasus Astro NYX-101 Mounts # PEG-CABL-GX12
    Pegasus Astro PPBA/PPB-Micro/UPB Cable for Sky Watcher EQ6-R, AZ-EQ6, EQ8-R, EQ8-RH & Pegasu...
    Our Price: $21.12
    In Stock
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  13. Agena End Cap: ID = 2.00" (50.8mm), Plastic, Black
    Agena End Cap: ID = 2.00" (50.8mm), Plastic, Black
    Our Price: $3.00
    Out of Stock
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  14. Agena V Series Vixen-Style Dovetail Rail - 210mm (8.3") Length # VR-210A
    Agena V Series Vixen-Style Dovetail Rail - 210mm (8.3") Length # VR-210A
    Our Price: $26.00
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  15. ZWO 2" to 1.25" Filter Adapter Ring # 2-1.25FL
    ZWO 2" to 1.25" Filter Adapter Ring # 2-1.25FL
    Our Price: $17.00
    In Stock
    Free US Shipping Over $25
  16. Agena Dust Plug: OD = 0.965" (24.5mm), Plastic, Yellow
    Agena Dust Plug: OD = 0.965" (24.5mm), Plastic, Yellow
    Our Price: $0.80
    In Stock
    Free US Shipping Over $25
  17. Blue Fireball T Thread Spacer Ring with 6mm Extension # S-T6
    Blue Fireball T Thread Spacer Ring with 6mm Extension # S-T6
    Our Price: $16.95
    In Stock
    Free US Shipping Over $25
  18. Agena End Cap: ID = 2.00" (50.8mm), Plastic, Translucent - Short
    Agena End Cap: ID = 2.00" (50.8mm), Plastic, Translucent - Short
    Our Price: $2.75
    Out of Stock
    Free US Shipping Over $25
  19. Baader T2 Extension Tube - 40mm # T2-25B 1508153
    Baader T2 Extension Tube - 40mm # T2-25B 1508153
    Our Price: $30.00
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  20. Blue Fireball 1.25" Eyepiece Extension Tube with 1" Extension # X-01
    Blue Fireball 1.25" Eyepiece Extension Tube with 1" Extension # X-01
    Our Price: $20.95
    In Stock
    Free US Shipping Over $25
  21. ZWO M48 to M48 Extender / Spacer Ring with 16.5mm Extension # ZWO-M48-EXT16.5
    ZWO M48 to M48 Extender / Spacer Ring with 16.5mm Extension # ZWO-M48-EXT16.5
    Our Price: $24.00
    In Stock
    Free US Shipping Over $25
  22. Tele Vue M42 T-Ring Adapter for 1.25" 2.5x and 5x Powermate # PTR-1250
    Tele Vue M42 T-Ring Adapter for 1.25" 2.5x and 5x Powermate # PTR-1250
    Our Price: $53.00
    In Stock
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  23. Agena Flexible Slow Motion Cable with Rosette Handle - 11.5"
    Agena Flexible Slow Motion Cable with Rosette Handle - 11.5"
    Our Price: $11.50
    In Stock
    Free US Shipping Over $25
  24. Blue Fireball Eyepiece Holder (1.25") with T / T2 Female Thread (T2 Visual Back) # E-10
    Blue Fireball Eyepiece Holder (1.25") with T / T2 Female Thread (T2 Visual Back) # E-10
    Our Price: $28.95
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  1. clearance 7 items
  2. closeout 10 items
  3. coming-soon 26 items
  4. discontinued 36 items
  5. new 1153 items
  6. sale 12 items
  7. special 1 item
Adapter Specifications
  1. 0.965" Eyepiece Holder 2 items
  2. 0.965" Nosepiece 1 item
  3. 1.25" Eyepiece Holder 44 items
  4. 1.25" Nosepiece 18 items
  5. 2" Eyepiece Holder 50 items
  6. 2" Nosepiece 72 items
  7. M28.5 (1.25" Filter) Thread - Male 11 items
  8. M28.5 (1.25" Filter) Thread - Female 32 items
  9. M48 (2" Filter) Thread - Male 83 items
  10. M48 (2" Filter) Thread - Female 165 items
  11. T / T2 Filter Thread - Male 132 items
  12. T / T2 Filter Thread - Female 117 items
  13. SCT Thread - Male 37 items
  14. SCT Thread - Female 75 items
  15. C / CS Thread - Male 19 items
  16. C / CS Thread - Female 10 items
  17. M12 Webcam Thread - Male 3 items
  18. Meade ETX Thread - Female 1 item
  19. Miscellaneous Thread - Male 274 items
  20. Miscellaneous Thread - Female 177 items
  21. M42 (1.25" Filter) Thread - Female 6 items
Dovetail Design/Series
  1. Other 3 items
  2. V Series (Vixen) 56 items
  3. D Series (Losmandy) 33 items
  4. DV Series 7 items
  5. Arca-Swiss 12 items
Accessory Size
  1. 1.25 inch 6 items
  2. 2 inch 5 items
  3. 31mm Round Unmounted 2 items
  4. 36mm Round Unmounted 6 items
Screw Type
  1. Machine screw 1 item
  2. Thumb screw 39 items
Screw Heads
  1. Button 1 item
  2. Knurled 39 items
Material
  1. Plastic / Nylon 40 items
  2. Stainless Steel 1 item
Focuser Scope Type
  1. Reflector 11 items
  2. Refractor 11 items
  3. SCT 8 items
Manufacturer
  1. 3D Astro Accessories 123 items
  2. 3DiBari 1 item
  3. 4026 Astronomy 4 items
  4. Agena Astro 249 items
  5. Agena Hobby Supply 43 items
  6. All Other 7 items
  7. American Paper Optics 1 item
  8. Antares 21 items
  9. Artesky 3 items
  10. Askar 18 items
  11. Astrodevice 15 items
  12. Astrodymium 19 items
  13. Astronetics Design 2 items
  14. AstroPixels Publishing 2 items
  15. Astrozap 1 item
  16. Baader Planetarium 316 items
  17. Beamfist 1 item
  18. Berlebach 23 items
  19. Blue Fireball 262 items
  20. Bob's Knobs 68 items
  21. Brandon / Vernonscope 2 items
  22. BuckeyeStargazer 103 items
  23. Celestial Teapot Designs 1 item
  24. Celestron 133 items
  25. David Chandler Company 6 items
  26. DayStar Filters 16 items
  27. Dew-Ninja 2 items
  28. Dew-Not 20 items
  29. Explore Scientific 8 items
  30. Farpoint Astronomical 53 items
  31. Founder Optics 19 items
  32. GSO 100 items
  33. HoTech 20 items
  34. Howie Glatter 16 items
  35. Hubble Optics 1 item
  36. iOptron 41 items
  37. Kasai Trading Co. 2 items
  38. Kokusai Kohki 1 item
  39. Levenhuk 1 item
  40. Long Perng 2 items
  41. Lumicon 2 items
  42. Lunt Solar Systems 6 items
  43. Meade 23 items
  44. OCAL 2 items
  45. Pegasus Astro 131 items
  46. Player One Astronomy 2 items
  47. PrimaLuceLab 94 items
  48. ProAstroGear 3 items
  49. QHYCCD 66 items
  50. Revolution Imager 18 items
  51. Rigel Systems 12 items
  52. ROR 2 items
  53. Sharpstar 2 items
  54. Sky Watcher 33 items
  55. Starlight Instruments 65 items
  56. Takahashi 20 items
  57. Tele Vue 47 items
  58. Telrad 2 items
  59. Thousand Oaks Optical 6 items
  60. Track the Stars (TTS) 5 items
  61. Unihedron 16 items
  62. Universal Astro 6 items
  63. Vaonis 4 items
  64. Vixen Optics 8 items
  65. William Optics 73 items
  66. ZWO Astronomy Cameras 139 items
Telescope Series
  1. Celestron Advanced VX 1 item
Dovetail Length
  1. Up to 4" 1 item
  2. 4.1" - 6" 15 items
  3. 6.1" - 8" 10 items
  4. 8.1" - 10" 19 items
  5. 10.1" - 12" 6 items
  6. 12.1 - 14" 8 items
  7. Greater than 14" 25 items
Stock
  1. In Stock 1850 items
  2. Out of Stock 667 items
Price
  1. $0.00 - $1,000.00 2464 items
  2. $1,000.00 - $2,000.00 24 items
  3. $2,000.00 - $3,000.00 13 items
  4. $3,000.00 - $4,000.00 1 item
  5. $4,000.00 - $5,000.00 8 items
  6. $5,000.00 - $6,000.00 3 items
  7. $7,000.00 - $8,000.00 3 items
  8. $8,000.00 - $9,000.00 1 item
$ - $