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  1. On Sale
    Lumicon 2" Multiple Filter Selector # LF5015
    Lumicon 2" Multiple Filter Selector # LF5015
    Sale Price: $188.96 Our Price: $251.95
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  2. Closeout
    Lumicon Infrared Blocking Filter - 1.25" # LF3140
    Lumicon Infrared Blocking Filter - 1.25" # LF3140
    Sale Price: $151.96 Our Price: $189.95
    Out of Stock
    Free US Shipping
  3. On Sale
    QHY 5-III 462M Monochrome Astronomy Camera with USB 3.0 # QHY5-III-462-M
    QHY 5-III 462M Monochrome Astronomy Camera with USB 3.0 # QHY5-III-462-M
    Sale Price: $224.10 Our Price: $249.00
    In Stock
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  4. On Sale
    ZWO FF107 Apo 107mm f/7 Petzval Refractor Telescope # FF107-APO
    ZWO FF107 Apo 107mm f/7 Petzval Refractor Telescope # FF107-APO
    Sale Price: $1,999.00 Our Price: $2,499.00
    Out of Stock
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  5. On Sale
    QHY 600M-PH SBFL Cooled Monochrome Astronomy Camera Kit with L-Pro OAG & Large 3XL Filter Wheel
    QHY 600M-PH (Standard BFL Version) Cooled Monochrome Astronomy Camera Kit with L-Pro OAG & L...
    Our Price: $4,700.50
    In Stock
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  6. On Sale
    QHY Off-Axis Guider - Large # OAG-L
    QHY Off-Axis Guider - Large # OAG-L
    Sale Price: $224.10 Our Price: $249.00
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  7. Celestron UpClose G2 10x25 Roof Binoculars # 71232
    Celestron UpClose G2 10x25 Roof Binoculars # 71232
    Our Price: $24.95
    Out of Stock
    Free US Shipping Over $25
  8. Baader Mark II 2" Cool-Ceramic Safety Herschel Prism (Visual) # HERSCH-VII 2956510V
    Baader Mark II 2" Cool-Ceramic Safety Herschel Prism (Visual) # HERSCH-VII 2956510V
    Our Price: $589.00
    In Stock
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  9. Discontinued
    William Optics RedCat 51 II "U" 51mm f/4.9 Petzval Apo Imaging Refractor Telescope (do not delete)
    William Optics RedCat 51 II "U" 51mm f/4.9 Petzval Apo Imaging Refractor Telescope (do not d...
    Our Price: $865.00
    Out of Stock
    Free Contiguous US Shipping
  10. Discontinued
    William Optics RedCat 51 II "U" 51mm f/4.9 Petzval Apo Imaging Refractor Telescope (Discontinued)
    William Optics RedCat 51 II "U" 51mm f/4.9 Petzval Apo Imaging Refractor Telescope (Disconti...
    Our Price: $865.00
    Out of Stock
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  11. On Sale
    QHY 600M-PH (Standard BFL Version) Full Frame Monochrome Cooled Astronomy Camera # QHY600M-PH
    QHY 600M-PH (Standard BFL Version) Full Frame Monochrome Cooled Astronomy Camera # QHY600M-PH
    Sale Price: $3,909.15 Our Price: $4,599.00
    In Stock
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  12. On Sale
    Sky-Watcher Esprit 80mm ED Triplet Apo Refractor OTA # S11400
    Sky-Watcher Esprit 80mm ED Triplet Apo Refractor OTA # S11400
    Sale Price: $1,699.00 Our Price: $2,230.00
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  13. On Sale
    Celestron Labs S10-60 Stereo Microscope # 44208
    Celestron Labs S10-60 Stereo Microscope # 44208
    Sale Price: $189.99 Our Price: $219.95
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  14. On Sale
    Long Perng 1.25" 55º Long Eye Relief Eyepiece -12.5mm # E12.5LE
    Long Perng 1.25" 55º Long Eye Relief Eyepiece -12.5mm # E12.5LE
    Sale Price: $85.50 Our Price: $95.00
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  15. Closeout
    Antlia 2.8nm Narrowband Oxygen III (OIII) Ultra Imaging Filter - 36mm Round Unmounted
    Antlia 2.8nm Narrowband Oxygen III (OIII) Ultra Imaging Filter - 36mm Round Unmounted
    Sale Price: $344.00 Our Price: $430.00
    Out of Stock
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  16. On Sale
    QHY 5-III 678C (Ver. 2) 8.4 MP Color Astronomy Camera with USB 3.2 # QHY5-III-678-C
    QHY 5-III 678C (Ver. 2) 8.4 MP Color Astronomy Camera with USB 3.2 # QHY5-III-678-C
    Sale Price: $269.10 Our Price: $299.00
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  17. Discontinued
    Meade LPI-G Camera - Lunar, Planetary Imager and Guider (Monochrome) # 645002
    Meade LPI-G Camera - Lunar, Planetary Imager and Guider (Monochrome) # 645002
    Sale Price: $59.99 Our Price: $219.99
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  18. On Sale
    Sky-Watcher 10" Flextube Dobsonian Telescope # S11720
    Sky-Watcher 10" Flextube Dobsonian Telescope # S11720
    Sale Price: $799.00 Our Price: $1,020.00
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  19. Celestron Nature 10x25 Monocular # 71210
    Celestron Nature 10x25 Monocular # 71210
    Our Price: $49.95
    In Stock
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  20. Closeout
    Long Perng 2" 80º Wide Angle Lanthanum Eyepiece - 14mm # E14W-CU01
    Long Perng 2" 80º Wide Angle Lanthanum Eyepiece - 14mm # E14W-CU01
    Sale Price: $220.00 Our Price: $269.00
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  21. Celestron AstroMaster 70AZ Telescope # 21061
    Celestron AstroMaster 70AZ Telescope # 21061
    Our Price: $189.95
    Out of Stock
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  22. Closeout
    Long Perng 1.25" 55º Long Eye Relief Eyepiece - 3mm # E3LE
    Long Perng 1.25" 55º Long Eye Relief Eyepiece - 3mm # E3LE
    Sale Price: $83.60 Our Price: $95.00
    In Stock
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  23. Closeout
    Antlia 2.8nm Narrowband H-Alpha (Ha) Ultra Imaging Filter - 36mm Round Unmounted
    Antlia 2.8nm Narrowband H-Alpha (Ha) Ultra Imaging Filter - 36mm Round Unmounted
    Sale Price: $344.00 Our Price: $430.00
    Out of Stock
    Free US Shipping
  24. On Sale
    ZWO FF130 Apo 130mm f/7.7 Petzval Refractor Telescope # FF130-APO
    ZWO FF130 Apo 130mm f/7.7 Petzval Refractor Telescope # FF130-APO
    Sale Price: $2,999.00 Our Price: $3,499.00
    In Stock
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  1. clearance 142 items
  2. closeout 37 items
  3. discontinued 6 items
  4. new 60 items
  5. sale 30 items
  6. special 10 items
Adapter Specifications
  1. T / T2 Filter Thread - Female 1 item
  2. SCT Thread - Male 4 items
  3. SCT Thread - Female 3 items
  4. Miscellaneous Thread - Male 1 item
Accessory Size
  1. 1.25 inch 14 items
  2. 2 inch 8 items
  3. 36mm Round Unmounted 3 items
Color
Eyepiece Field of View
  1. 51 - 60 degrees 8 items
  2. 71 - 80 degrees 4 items
Telescope Mount Type
  1. No Mount (OTA Only) 27 items
  2. Alt-Azimuth (AZ) 3 items
  3. Equatorial (EQ) 4 items
  4. Fork (Dual Arm) 7 items
  5. Fork (Single Arm) 3 items
  6. Dobsonian 10 items
Binocular Prism Type
  1. Porro Prism 1 item
  2. Roof Prism 8 items
Manufacturer
  1. Agena Astro 2 items
  2. Antlia Filters 3 items
  3. Askar 6 items
  4. Baader Planetarium 25 items
  5. Berlebach 1 item
  6. Blue Fireball 3 items
  7. Celestron 67 items
  8. Coronado 1 item
  9. Explore Scientific 7 items
  10. Founder Optics 2 items
  11. GSO 6 items
  12. iOptron 4 items
  13. Levenhuk 2 items
  14. Long Perng 13 items
  15. Lumicon 13 items
  16. Meade 18 items
  17. Optolong 5 items
  18. Pegasus Astro 1 item
  19. Pentax 1 item
  20. PrimaLuceLab 11 items
  21. QHYCCD 57 items
  22. Sharpstar 2 items
  23. Sky Watcher 22 items
  24. Spectrum Telescope 3 items
  25. Tele Vue 6 items
  26. Thousand Oaks Optical 1 item
  27. Vaonis 1 item
  28. Vixen Optics 2 items
  29. William Optics 20 items
  30. ZWO Astronomy Cameras 31 items
Binocular Series
  1. Celestron Nature DX 3 items
  2. Celestron Nature DX ED 2 items
  3. Celestron Outland X 1 item
  4. Celestron SkyMaster 1 item
  5. Celestron TrailSeeker 2 items
  6. Celestron UpClose 1 item
Telescope Series
  1. Askar PHQ 1 item
  2. Askar V 1 item
  3. Celestron Advanced VX 1 item
  4. Celestron AstroMaster 1 item
  5. Celestron CPC 4 items
  6. Celestron NexStar Evolution 2 items
  7. Celestron NexStar SE 1 item
  8. Celestron PowerSeeker 1 item
  9. Celestron RASA 1 item
  10. Celestron Spotting Scopes 3 items
  11. Celestron StarSense Explorer 6 items
  12. Founder Optics Draco Refractor 1 item
  13. GSO Ritchey-Chrétien 1 item
  14. Meade LX85 6 items
  15. Meade LX90 1 item
  16. Meade LX200-ACF 2 items
  17. Sharpstar Refractors 1 item
  18. Sky Watcher Flextube Dobsonian 2 items
  19. Sky Watcher Esprit APO 3 items
  20. Sky Watcher EvoStar 3 items
  21. Sky Watcher Flextube SynScan Dobsonian 1 item
  22. Sky Watcher ProEd 1 item
  23. Sky Watcher Traditional Dobsonian 2 items
  24. Vaonis Vespera 1 item
  25. William Optics GT 2 items
  26. William Optics RedCat 5 items
  27. William Optics Zenith Star 2 items
  28. ZWO Refractors 4 items
Telescope Aperture
  1. Up to 2" [51mm] 4 items
  2. 2.1 - 3" [76mm] 6 items
  3. 2.1 - 3" [76mm] 3 items
  4. 3.1 - 4" [102mm] 9 items
  5. 4.1 - 5" [127mm] 8 items
  6. 5.1 - 6" [153mm] 8 items
  7. 6.1 - 8" [203mm] 12 items
  8. 8.1 - 10" [254mm] 4 items
  9. 10.1 - 12" [305mm] 4 items
Telescope Optical Design
  1. Advanced Coma Free (ACF) 7 items
  2. Aplanatic Schmidt (EdgeHD) 3 items
  3. Astrograph 6 items
  4. Schmidt-Cassegrain 5 items
  5. Newtonian Reflector 12 items
  6. Ritchey-Chretien 1 item
  7. Doublet (Achromat) 2 items
  8. Doublet (Apochromat) 5 items
  9. Triplet (Apochromat) 6 items
  10. Petzval 6 items
  11. Other 1 item
Telescope Focal Length
  1. Up to 300mm 4 items
  2. 301 - 400mm 6 items
  3. 401 - 500mm 5 items
  4. 501 - 600mm 3 items
  5. 601 - 700mm 2 items
  6. 701 - 800mm 3 items
  7. 801 - 900mm 5 items
  8. 901 - 1000mm 2 items
  9. 1001 - 1250mm 7 items
  10. 1251 - 1500mm 3 items
  11. 1501 - 1750mm 2 items
  12. 1751 - 2000mm 1 item
  13. 2001 - 2500mm 9 items
  14. 2501 - 3000m 2 items
Telescope Focal Ratio
  1. Up to f/4 4 items
  2. f/4.1 - f/5 13 items
  3. f/5.1 - f/6 7 items
  4. f/6.1 - f/7 6 items
  5. f/7.1 - f/8 8 items
  6. f/8.1 - f/9 1 item
  7. f/9.1 - f/10 15 items
  8. f/12.1 - f/13 1 item
Eyepiece Focal Length
  1. 5mm and Under 4 items
  2. 5.1mm - 10mm 2 items
  3. 10.1mm - 15mm 5 items
  4. 15.1mm - 20mm 1 item
Experience Level
  1. Beginner 8 items
  2. Intermediate 26 items
  3. Advanced 11 items
Stock
  1. In Stock 262 items
  2. Out of Stock 75 items
Price
  1. $0.00 - $1,000.00 251 items
  2. $1,000.00 - $2,000.00 38 items
  3. $2,000.00 - $3,000.00 18 items
  4. $3,000.00 - $4,000.00 15 items
  5. $4,000.00 - $5,000.00 11 items
  6. $5,000.00 - $6,000.00 1 item
  7. $6,000.00 - $7,000.00 1 item
  8. $7,000.00 - $8,000.00 1 item
  9. $8,000.00 - $9,000.00 1 item
$ - $