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Aperture

1. 3" & Under (15)
2. 3.1" - 4"  (29)
3. 4.1" - 5"  (18)
4. 5.1" - 6"  (27)
5. 6.1" - 7"  (6)
6. 7.1" - 8"  (35)
7. 8.1" - 10"  (24)
8. 10.1" - 12"  (23)
9. 12.1" - 14"  (10)
10. 14.1" - 16"  (8)
11. 16.1" & Up  (4)
12. Up To 70mm (4)
13. 71mm - 90mm (7)
14. 91mm - 115mm (2)
15. 116mm & Up (6)

Auto-Alignment, WiFi, GPS, and Bluetooth Adapters

1. WiFi Module  (1)

Barlow Magnification

1. 2.5x (2)
2. 2x (8)
3. 3x (5)
4. 4x (1)
5. 5x (2)

Barrel size for eyepieces and barlows

1. 1.25" (102)
2. 1.25"/2" (6)
3. 2" (41)
4. 3" (1)

Binocular Series

1. Celestron Nature DX (4)

Binocular Size Range

1. 36mm-42mm (2)
2. 43mm-50mm (2)

Binocular Type

1. Roof prism (4)

CCD and Photographic

1. Camera Adapters (5)
2. Focal Reducer and Field Flattener Combos (1)
3. Illuminated Reticle Eyepieces (2)
4. Misc. SBIG (1)
5. Off Axis Guiders (1)
6. Photographic Guide Scopes (1)
7. Piggyback Camera Mounts (1)
8. Prime Focus Photography (3)
9. Smart Phone Adapters (1)
10. T-Adapters (6)
11. T-Rings (2)
12.  Coma Correctors (1)

CCD Cameras

1. Celestron (3)
2. Meade (6)

Dovetails That Fit Or That Are Made By

1. Astro-Tech (2)
2. Celestron (8)
3. Losmandy (3)
4. Meade (1)

Dovetail Length

1. 13" and Longer (1)
2. 4.1" - 7.9" (1)

Dovetail Plate Type

1. Dovetails (Male)  (7)
2. Guidescope Rings (2)

Dovetail Width

1. 1.7" (V Series/Vixen)  (4)
2. 4" (D Series/Losmandy)  (7)
3. D & V Combo  (2)

Eyepiece Field of View Range

1. up to 50° (12)
2. 51°-60° (25)
3. 61°-70° (34)
4. 71°-82° (36)
5. 83°-100° (19)
6. 101° and Up (2)

Eyepiece Focal Length

1. up to 3mm (5)
2. 3.1mm-5mm (13)
3. 5.1mm-7mm (12)
4. 7.1mm-10mm (19)
5. 10.1mm-13mm (11)
6. 13.1mm-16mm (14)
7. 16.1mm-19mm (10)
8. 19.1mm-21mm (10)
9. 21.1mm-24mm (6)
10. 24.1mm-27mm (6)
11. 27.1mm and Up (17)
12. Zoom (3)
13. Eyepiece Sets and Kits (5)

Eyepiece Series

1. Celestron Luminos (7)
2. Celestron Omni Plössl (7)
3. Celestron X-Cel LX (9)
4. Celestron Zoom (1)
5. Coronado Solar Cemax (2)
6. Explore Scientific 100° (7)
7. Explore Scientific 120° (1)
8. Explore Scientific 52° (9)
9. Explore Scientific 62° (7)
10. Explore Scientific 68° (7)
11. Explore Scientific 82° (9)
12. Explore Scientific 92° (2)
13. Meade Series 5000 Mega Wide Angle 100° (4)
14. Meade Series 5000 Ultra Wide Angle 82° (4)
15. Pentax XL (1)
16. Pentax XW (6)
17. Pentax Zoom (1)
18. Tele Vue DeLites (9)
19. Tele Vue Delos (8)
20. Tele Vue Ethos (7)
21. Tele Vue Naglers (9)
22. Tele Vue Panoptics (5)
23. Tele Vue Paracorr (1)
24. Tele Vue Plössls (8)
25. Tele Vue Zooms (1)

Eye Relief

1. 10mm - 12mm  (18)
2. 13mm - 15mm  (28)
3. 16mm - 18mm  (19)
4. 19mm & Up  (49)
5. 9mm or Less  (9)
6. Variable - Zoom Eyepiece  (3)

Filter Sizes

1. 1.25"  (5)
2. 2"  (3)
3. 48mm  (2)

Finderscope Types

1. Illuminated (1)
2. Image Erecting (1)
3. Red Dot Finders  (1)
4. Right Angle Optical Finders  (1)
5. Straight-Through Optical Finders  (1)

Focal Ratio

1. f/10.1 - f/14.0 (15)
2. f/14.1 - f/15.0  (7)
3. f/2.1 - f/4.0  (10)
4. f/4.1 - f/6.0  (46)
5. f/6.1 - f/8.0  (50)
6. f/8.1 - f/10.0  (70)

Focusing Controls, Adapters, and Accessories

1. Focuser Adapter (1)
2. Motorized  (1)

Microscopes

1. Microscopes (1)

Observing Aids

1. Flashlights (1)

Optical Tube Rings and Tube Holders

1. 115mm-150mm (2)
2. 4.1" - 6" (3)
3. 91mm to 114mm (1)
4. Up to 4" (1)

Payload Capacity

1. 15 lbs. or less (5)
2. 16lbs. To 30 lbs (5)
3. 31lbs - 45lbs (3)
4. 76lbs - 90lbs (2)

Power of Binoculars

1. 10x (2)
2. 12x (1)
3. 8x (1)

Power Supplies and Accessories

1. AC Adapter (2)
2. Battery/Battery Pack  (4)

Solar Binoculars, Viewers, and Accessories

1. Solar Mounts (1)

Spotting Scope Accessories

1. Eyepieces (7)

Spotting Scope Aperture

1. 50mm-60mm (1)
2. 81mm & Up (1)

Spotting Scope Body Style

1. Angled (1)
2. Straight Through (1)

Spotting Scope Manufacturers

1. Bushnell & Konus (1)
2. Celestron (1)
3. Pentax (7)

Spotting Scope Optical Design

1. Refractor (1)
2. Schmidt-Cassegrain (1)

Spotting Scope Series

1. Bushnell (1)
2. Celestron C5 (1)

Star Diagonal/Image Erecting Diagonal Size

1. 1.25" (2)
2. 2" (4)

Telescopes

1. Auto Alignment Included (1)
2. Computer Go-To (95)
3. GPS Included (32)
4. GPS Optional (35)
5. Manual (11)
6. Motor Drive Available (1)
7. Motor Drive Included (1)
8. Non-Computerized (14)
9. Optical Tube (86)
10. Smart Device Control Enabled (6)
11. Smart Device Control Optional (67)
12. StarSense Auto Alignment Available (32)
13. WiFi Enabled (6)
14. WiFi Optional (62)

Telescope and Mount Counterweights

1. Counterweight  (3)

Telescope Covers, Light Shrouds, and Cases

1. Telescope Cases (3)

Telescope Mounts

1. Alt-Azimuth (8)
2. Camera Tracking System (1)
3. Computer GOTO (12)
4. Dual Alt-Az/Equatorial (1)
5. Equatorial (10)
6. GPS Included (2)
7. GPS Optional (2)
8. Motor Driven (1)
9. Single Arm (2)
10. Smart Device Control Included (2)
11. Smart Device Control Optional (4)
12. WiFi Included (1)
13. WiFi Optional (4)

Telescope Mount Type

1. Alt-Azimuth (40)
2. Dobsonian (20)
3. Equatorial (32)
4. Equatorial Optional (23)
5. Fork mount (26)
6. No Mount Optical Tube Only (55)
7. Single Arm (9)

Telescope Series

1. Astro-Tech ED Refractors (1)
2. Astro-Tech EDT Refractors (2)
3. Astro-Tech Imaging Newtonians (1)
4. Astro-Tech Ritchey-Chretiens (3)
5. Celestron Advanced VX (11)
6. Celestron AstroMaster (1)
7. Celestron CGEM DX (1)
8. Celestron CGEM II (8)
9. Celestron CGX (5)
10. Celestron CGX-L (4)
11. Celestron CPC (6)
12. Celestron EdgeHD Optical Tubes (5)
13. Celestron NexStar Evolution (4)
14. Celestron NexStar SE (4)
15. Celestron Optical Tube Assemblies (4)
16. Celestron RASA (2)
17. Celestron RASA Optical Tubes (1)
18. Coronado Solar Telescopes (12)
19. Explore Scientific APO Triplet Carbon Fiber (4)
20. Explore Scientific APO Triplet FCD100 Carbon Fiber (2)
21. Explore Scientific APO Triplet FCD100 Series (3)
22. Explore Scientific APO Triplets Essential Series (3)
23. Explore Scientific AR Doublet (3)
24. Explore Scientific Newtonian Reflectors (2)
25. Explore Scientific Truss Dobsonians (3)
26. Lunt Solar Telescopes (2)
27. Meade ETX (3)
28. Meade LX200 (10)
29. Meade LX600 (9)
30. Meade LX65 (5)
31. Meade LX85 (9)
32. Meade LX850 (6)
33. Meade LX90 (3)
34. Meade Optical Tube Assemblies (19)
35. Meade Series 6000 Refractor (4)
36. Sky-Watcher Esprit (4)
37. Sky-Watcher GoTo Collapsible Dobsonians (5)
38. Sky-Watcher Maksutov Telescopes (8)
39. Sky-Watcher Pro ED APO (8)
40. Sky-Watcher Quattro Imaging Newtonians (3)
41. Sky-Watcher Traditional Dobsonians (3)
42. Sky-Watcher Truss Tube Collapsible Dobsonian (7)
43. Sky-Watcher Virtuoso (1)
44. Tele Vue Doublet APO (5)
45. Tele Vue Nagler-Petzval APO (2)

Telescope Type

1. Advanced Coma Free (41)
2. Astrograph Telescopes (22)
3. Cassegrain Telescopes  (72)
4. Dobsonian Reflector Telescopes  (20)
5. EdgeHD Telescopes (21)
6. Hydrogen-Alpha Solar Telescopes (12)
7. Imaging Newtonian (4)
8. Maksutov Telescopes (21)
9. Optical Tube Assemblies (42)
10. Reflector Telescopes  (11)
11. Refractor Telescopes (49)
12. Ritchey-Chretien Telescopes (3)
13. Rowe-Ackermann RASA (4)

Tripod, Pier, and Mount Accessories

1. Dual-Axis Drives (1)
2. Equatorial Wedges (4)
3. GPS, Time & Data Modules & Hubs  (1)
4. RA Drives (1)
5. WiFi Accessories (1)

Types Of Barlows

1. Barlow (9)
2. Focal Extender (5)
3. Powermate (4)

Types Of Filters

1. Color  (1)
2. Imaging Filter Kits/Sets (3)
3. Imaging Filters (2)
4. Light Pollution Reduction  (1)
5. LRGB  (3)
6. Oxygen III  (2)
7. UHC (2)
8. Visual Filters (5)

Visual Accessories

1. Binoviewers & Accessories  (1)
2. Cleaning & Maintenance (1)
3. Coma Corrector (1)
4. Diagonals (6)
5. Finders & Accessories  (3)
6. Visual Backs  (1)

Weight Of A Counterweight

1. 10.1 lbs. - 20 lbs. (3)
2. 20.1 lbs. and Over (1)

Manufacturer

1. Astro-Tech (16)
2. Bushnell (1)
3. Celestron (145)
4. Coronado (16)
5. Explore Scientific (72)
6. Losmandy (1)
7. Lunt Solar Systems (2)
8. Meade (91)
9. Pentax (7)
10. SBIG (1)
11. Sky-Watcher (43)
12. TeleVue (62)
13. Various Manufacturers (2)

Price

Range : $  -  $