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Telescope Aperture

1. 3.1" - 4" (1)

Telescope Focal Ratio

1. f/4.1 - f/6 (2)
2. f/6.1 - f/8 (1)

Telescope Focal Length

1. 101mm - 400mm (1)
2. 401mm - 800mm (2)

Load Capacity

1. 0-15 lbs. (1)
2. 31-45 lbs. (1)
3. 91+ lbs. (2)

Mount Electronics

1. Manual - No Electronics (1)
2. Fully Computerized GoTo (3)

Mount Design

1. Tripod (9)
2. Alt Azimuth (AZ) (3)
3. Equatorial (EQ) (2)
4. Pier (1)

Includes GPS?

1. No (3)

Features

1. Night Vision (2)
2. Water Proof/ Resistant (2)

Best Used For

1. Night Vision (2)

Material

1. Film (81)
2. Glass (107)

On or Off Axis?

1. Off Axis (11)
2. On Axis (174)

Aperture

1. 50mm (2)
2. 60mm (2)
3. 90mm (1)
4. Film Sheet (1)
5. 2" - 4" (41)
6. 4.1" - 6" (31)
7. 6.1" - 8" (22)
8. 8.1" - 10" (25)
9. 10.1" - 12" (17)
10. 12" & Larger (27)

Filter Type

1. Blue (for UBVRI) (4)
2. Clear/Luminance (24)
3. Color Correcting/ Violet Reduction (1)
4. Energy Rejection (18)
5. Infrared (for UBVRI) (22)
6. Methane (1)
7. Nitrogen II (4)
8. Red (for UBVRI) (4)
9. Red Continuum (1)
10. Solar Continuum (3)
11. UBVRI Filter Set (8)
12. UHC (19)
13. Ultra Violet (for UBVRI) (21)
14. Visual (for UBVRI) (4)
15. Solar - Calcium (1)
16. Color (9)
17. Comet (2)
18. H-Alpha (Non-Solar) (49)
19. H-Beta (14)
20. Moon/ Neutral Density (24)
21. Nebula (14)
22. Oxygen III (71)
23. Sky Glow/ City Light Suppression (68)
24. Sulfur II (32)
25. Variable Polarizer (10)

Non-Solar Filter Size & Mounting

1. 1.25" - Mounted (170)
2. 2" - Mounted (90)
3. 2" - Unmounted (1)
4. 28mm - Unmounted (17)
5. 31mm - Mounted (1)
6. 31mm - Unmounted (31)
7. 36mm - Mounted (1)
8. 36mm - Unmounted (28)
9. 49mm - Round (Unmounted) (2)
10. 50mm - Round (Mounted) (6)
11. 50mm - Round (Unmounted) (52)
12. 50mm - Square (Unmounted) (48)
13. 65mm - Square (Unmounted) (26)
14. 72mm - Round (Mounted) (6)
15. 77mm - Round (Mounted) (3)
16. 82mm - Round (Mounted) (6)
17. Canon Clip (34)
18. Nikon Clip (25)

Adapter Length

1. 0mm - 10mm (2)

Adapter Side A

1. 3.5" Male (1)
2. EOS Mount (2)
3. Nikon F Mount (1)

1. 3.5" Male (1)
2. T-Thread Female (2)

What Type of Focus Accessory?

1. Digital Focuser (2)
2. Focus Mask (29)
3. Focus Motor (39)
4. Focuser (89)

Focusing Mask Size

1. 9.1" - 12" (2)

Focuser Size

1. 1.25" (7)
2. 2" (33)
3. 2.5" (2)
4. 3" (19)
5. 3.5" (3)

Focuser Speed Ratio

1. 1:10 (3)

Focuser Design

1. Crayford (41)
2. FeatherTouch (29)
3. Rack and Pinion (9)

Filter Slots Available

1. 10 (2)
2. 5 (9)
3. 6 (1)
4. 7 (2)
5. 8 (5)

For Filters Of What Size?

1. 1.25" Mounted (3)
2. 2" (50.8mm) Round Unmounted (1)
3. 2" (50.8mm) Square Unmounted (2)
4. 25mm Unmounted (2)
5. 28mm Unmounted (1)
6. 31mm Unmounted (2)
7. 36mm Unmounted (2)
8. 65mm Squared Unmounted (3)

Design

1. Coma Corrector (7)
2. Extender (14)
3. Extender/ Flattener (2)
4. Field Flattener (11)
5. Flattener/ Reducer (6)
6. Reducer (21)
7. Reducer/ Corrector (13)
8. Telecompressor (14)

Barrel Or Connection Size

1. 1.25" Barrel (168)
2. 1.25" Threaded (6)
3. 1.25"/ 2" Variable (33)
4. 2" Barrel (48)
5. 3" Barrel (1)
6. SCT Standard Thread (1)

Eyepiece Focal Length

1. 0mm - 5mm (29)
2. 10.1mm - 20mm (85)
3. 20.1mm - 30mm (35)
4. 30.1mm - 40mm (25)
5. 40.1mm - 50mm (2)
6. 5.1mm - 10mm (64)
7. 50.1mm - 60mm (2)
8. Zoom Eyepiece (9)

Eyepiece Design

1. Delos (8)
2. Ethos (8)
3. Nagler (13)
4. Panoptic (5)
5. Plossl (9)
6. Wide Angle (24)

Eyepiece Special Feature

1. Argon Purged (24)
2. Fog Proof (10)
3. Nitrogen Purged (1)
4. Waterproof (23)

Eyepiece Eye Relief

1. Long: 16mm or More (132)
2. Moderate: 11mm - 15mm (53)
3. Short: Less than 10mm (27)
4. Variable (5)

Wratten Number

1. 8 (Yellow) (2)
2. 12 (Deep Yellow) (1)
3. 21 (Orange) (2)
4. 23A (Light Red) (1)
5. 25 (Red Tricolor) (1)
6. 29 (Deep Red) (1)
7. 47B (Deep Blue Tricolor) (1)
8. 56 (Light Green) (1)
9. 58 (Green Tricolor) (1)
10. 80A (Blue) (2)

Eyepiece Field of View

1. 100-120° FOV (26)
2. 80-99° FOV (39)
3. 60-79° FOV (78)
4. 40-59° FOV (82)
5. Variable (7)

Product Type

1. Bag / Case (221)
2. Tripod / Mount (15)

Counterweight Weight

1. 0 - 2 Ibs (6)
2. 2.1 - 5 Ibs (16)
3. 5.1 - 8 Ibs (5)
4. 8.1 - 12 Ibs (18)
5. 12 -15 Ibs (1)
6. 15.1 Ibs and higher (21)

Dovetail Type

1. D Standard (60)
2. V Standard (13)
3. Dual (4)
4. Male to Male (1)
5. Piggyback (4)
6. D and V Series (1)

Saddle Plate Type

1. V Standard (13)
2. D Standard (21)
3. Dual (35)

Ring Inner Diameter

1. 50mm and smaller (1)
2. 51mm - 100mm (17)
3. 101mm - 150mm (40)
4. 151mm - 200mm (21)
5. 201mm - 250mm (11)
6. 251mm - 300mm (9)
7. 301mm - 350mm (7)
8. 351mm - 400mm (6)
9. 401mm - 450mm (5)
10. 451mm - 500mm (1)
11. 501mm - 550mm (1)
12. 551mm - 600mm (1)
13. 651mm - 700mm (1)

Warranty Type

1. 3 Years Diamond (28)
2. 3 Years Regular (7)
3. 5 Years Diamond (21)

Price

1. $0.00 - $299.99 (4548)
2. $300.00 - $599.99 (636)
3. $600.00 - $899.99 (202)
4. $900.00 - $1,199.99 (113)
5. $1,200.00 - $1,499.99 (50)
6. $1,500.00 - $1,799.99 (31)
7. $1,800.00 - $2,099.99 (29)
8. $2,100.00 - $2,399.99 (15)
9. $2,400.00 - $2,699.99 (23)
10. $2,700.00 - $2,999.99 (17)
11. $3,000.00 - $3,299.99 (11)
12. $3,300.00 and above (59)