Telescope – Leisure Time LX20 User Manual

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Telescope

Ophcai Design

8" LX200I/10

an-Schmidt-Cassegrain
Catadioptric

10" LX200f/10

Schmidt-Cassegrain Catadioptric

200 f/10

Schmidt-Cassegrain Catadioptric

Clear Aperture

203mm (8")

254mm (10")

305mm (12")

Primary Mirror Diameter

209.6mm (8.25)

263.5mm (10.375)

314.3mm (12.375")

Focal Length

2000mm (80")

2500mm (100")

3048mm (120")

Focal Ratio

f/10

Resolution

.56 arc sec

.45 arc sec

.375 arc sec

Super Multi-Coatings

Standard

Limiting Visual Magnitude (approx)

14.0

14.5

15.0

Limiting Photographic Magnitude (approx)

16.5

17.0

17.5

Image Scale (°/inch)

0.72°/inch

0.57°/inch

0.48°/inch

Maximum Practical Visual Power

500X

625X

750X

Near Focus

25'

50'

75'

Optical Tube Size

9.1" Dia. x 16" Long

11.75" Dia. x 22" Long

13.6" Dia. X25" Long

Secondary Mirror Obstruction

3.0" (14.1%)

3.7" (13.7%)

4.0" (11.1%)

Telescope Mounting

Heavy-Duty Fork-Type Double
Tine

Heavy-Duty Fork-Type Double Tine

Setting Circle Diameters

Dec.: 6"; R.A.: 8.75"

RA Motor Drive System

9-speed, microprocessor

controlled 12v. DC servo motor;
5.75" worm gear with Smart Drive

9-speed, microprocessor controlled

12v. DC servo motor; 5.75" worm
gear with Smart Drive

9-Speed, microprocessor controlled

12v. DC servo motor; 5.75" worm
gear with Smart Drive

Hemispheres of Operation

North and South -switchable

Declination Control System

9-speed, DC servo controlled
5.75" worm gear with Dec drift
software

9-speed, DC servo controlled 5.75"
worm gear with Dec drift software

9-speed, DC servo controlled 5.75"

worm gear with Dec drift software

Motor Drive Gear Diameter

5-3/4" Worm Gear

Manual Slow-Motion Controls

Dec. and R.A.

Hand Controller

Motorola 68HC05 microcontroller;
2 line x 16 alphanumeric character
display; 19 button keypad, red LED
backlit

Motorola 68HC05 microcontroller; 2
line x 16 alphanumeric character
display; 19 button keypad, red LED
backlit

Main Controller

16 MHz 68000 microprocessor; 1
Meg program memory 16KRAM;
512 byte non-volatile memory
(EEROM)

16 MHz 68000 microprocessor; 1 Meg
program memory 16K RAM; 512 byte
non-volatile memory (EEROM)

16 MHz 68000 microprocessor; 1 Meg
program memory 16K RAM; 51 2 byte
non-volatile memory (EEROM)

Telescope Size, Swung Down

9.25" x 16"x25"

12" x 19" x 31"

15"x20"x37"

35mm Angular Film Coverage

0.97° x 0.68°

0.78° x 0.54°

0.65° x 0.45°

35mm Linear Film Coverage @:
50"

6.2" x 8.7"

5.0" x 7.0"

4.1" x 5.8"

500"

6.0

x 8.5'

4.8' x 6.8'

4.0' x 5.7'

3000"

36.0' X 51.0'

28.8' x 40.8'

24.0' x 34.0'

Tele-Extender Used Without Eyepiece @:
50'

6.8" X 8.5"

4.6" x 6.8"

3.5" x 5.7"

500'

4.9' x 7.2'

4.0' x 5.8'

3.3' x 4.8'

3000'

3 1 ' x 4 5 '

25' X 36'

2 1 ' x 3 0 '

Net Telescope Weights (approx)
Telescope

37#

61#

70#

Optional Equatorial Wedge

N/A

Optional Super Wedge

N/A

26#

Field Tripod

20#

50#

Accessories

Shipping Weights (approx)
Telescope

64# (w/ case)

69#

95# (w/ case)

Equatorial Wedge (optional)

N/A

Super Wedge (optional)

N/A

38#

Field Tripod

26#

57#

Case (for 1 0" models)

30#

N/A

Accessories

10#