|
|
| TELESCOPE: |
8"
LX90 |
7"
LX200GPS |
8"
and 10" LX200GPS |
|
|
| Optical
Design |
Schmidt-Cassegrain |
Maksutov-Cassegrain |
Schmidt-Cassegrain |
| Clear
Aperture |
203mm
(8") |
178mm
(7") |
203mm
(8"); 254mm (10") |
| Primary
Mirror Diameter |
209.6mm
(8.25") |
209.6mm
(8.25") |
209.6mm
(8.25"); 263.5mm (10.38") |
| Focal
Length, Focal Ratio |
2000mm
f/10 |
2670mm
f/15 |
2000mm
f/10 (8"); 2500mm f/10 (10") |
|
| Near
Focus (approx.) |
25 ft. |
50 ft. |
25 ft.
(8"); 50 ft. (10") |
| Resolving
Power (arc secs.) |
0.56 |
0.64 |
0.56
(8"); 0.45 (10") |
| Optical
Coatings |
MgF2
on correcting plate (2-sides); standard aluminum on primary
& secondary mirrors |
MgF2
on correcting plate (2-sides); standard aluminum on primary
& secondary mirrors |
MgF2
on correcting plate (2-sides); standard aluminum on primary
& secondary mirrors |
| Ultra-High
Transmission Coatings |
optional
at time of purchase |
optional
at time of purchase |
optional
at time of purchase |
| Limiting
Visual Magnitude (approx.) |
14.0 |
13.5 |
14.0
(8"); 14.5 (10") |
| Limiting
Photographic Magnitude (approx.) |
16.5 |
16.0 |
16.5
(8"); 17.0 (10") |
| Image
Scale (degs./inch) |
0.72 |
0.54 |
0.72
(8" f/10); 0.57 (10" f/10) |
|
| Maximum
Practical Visual Power |
600X |
550X |
600X
(8"); 650X (10") |
| 35mm
Angular Film Coverage |
0.68°
x 0.97° |
0.52°
x 0.74° |
0.68°
x 0.97° (8"); 0.54° x 0.78° (10") |
|
| Optical
Tube Dimensions (dia. x length) |
9.1"
x 16.75" |
9.1"
x 20.5" |
9.1"
x 16.75" (8"); 11.75" x 22" (10") |
| Secondary
Mirror Obstruction (dia.; %) |
3.0"-14.1% |
1.9"-7.4% |
3.0"-14.1%
(8"); 3.7"-13.7% (10") |
|
| Telescope
Mounting |
fork
type; double tine |
heavy-duty
fork type; double tine |
heavy-duty
fork type; double tine |
| Setting
Circle Diameters |
Dec:
5"; RA: 8" |
Dec:
5"; RA: 8.75" |
Dec:
5"; RA: 8.75" |
| RA
Motor Drive Systems |
9-speed,
microprocessor-controlled, 12v DC servo motor; 4.9" LX
worm gear |
185-speed,
microprocessor-controlled, 12v DC servo motor; 5.75"
LX worm gear with Smart Drive software |
185-speed,
microprocessor-controlled, 12v DC servo motor; 5.75"
LX worm gear with Smart Drive software |
|
| Hemispheres
of Operation |
North
and South, switchable |
North
and South, automatically selected by GPS input or by user
override |
North
and South, automatically selected by GPS input or by user
override |
| Declination
Control System |
9-speed,
microprocessor-controlled, 12v DC servo motor; 4.9" LX
worm gear |
185-speed,
microprocessor-controlled, 12v DC servo motor; 5.75"
LX worm gear with Smart Drive software |
185-speed,
microprocessor-controlled, 12v DC servo motor; 5.75"
LX worm gear with Smart Drive software |
|
| Primary
Mirror Lock |
no |
included
(progressive tension) |
included
(progressive tension) |
| GPS
Alignment |
no |
included
(16-channel GPS receiver, electronic sensors for true-level
and North, with magnetic declination compensation) |
included
(16-channel GPS receiver, electronic sensors for true-level
and North, with magnetic declination compensation) |
| GO
TO Pointing Precision (approx.) |
5-arc
mins. |
2-arc
mins. |
2-arc
mins. |
| Pointing
Precision, High-Precision Mode |
3-arc
mins. |
1-arc
min. |
1-arc
min. |
|
| Slow-Motion
Controls |
electric,
RA and Dec |
manual
and electric, RA and Dec. |
manual
and electric, RA and Dec. |
| Bearings |
Dec:
1 x 1.85" dia. ball bearing in each fork; RA: 1 x 2.25"
dia. and 1 x 2" dia. ball bearings |
Dec:
3 x 1.83" dia. ball bearings; RA: 1 x 4" dia. and
1 x 2.25" dia. ball bearings |
Dec:
3 x 1.83" dia. ball bearings; RA: 1 x 4" dia. and
1 x 2.25" dia. ball bearings |
|
| Autostar
Hand Controller |
PIC
16C57 microcontroller; 2 line x 16 alphanumeric character
display; 20-button keypad, red LED backlit |
Atmel
89C451 & PIC16C57 microcontrollers; 2 line x 16 alphanumeric
character display; 20-button keypad, red LED backlit |
Atmel
89C451 & PIC16C57 microcontrollers; 2 line x 16 alphanumeric
character display; 20-button keypad, red LED backlit |
|
| Main
Telescope Controller |
Motorola
68HC11 microprocessor; 1-Megabyte flash memory (field reprogrammable);
32K RAM |
distributed
intelligence architecture using 8 networked microcontrollers
(Motorola 68HC11, Atmel 89C451, 3 x PIC16C62, 2 x PIC16C54,
Sony digital signal processor); 3.5-Megabyte flash memory
(field reprogrammable), 32K RAM |
distributed
intelligence architecture using 8 networked microcontrollers
(Motorola 68HC11, Atmel 89C451, 3 x PIC16C62, 2 x PIC16C54,
Sony digital signal processor); 3.5-Megabyte flash memory
(field reprogrammable), 32K RAM |
|
| Batteries
(user-supplied) [Note 1] |
8 x
C-cells |
8 x
C-cells |
8 x
C-cells |
| Battery
Life (approx.) |
60 hrs. |
20 hrs. |
20 hrs. |
|
| Onboard
Celestial Object Database |
30,223
objects |
147,541
objects |
147,541
objects |
| Slew
Speeds |
RA and
Dec: 1x, 2x, 8x, 16x, 64x, 128x sidereal and 1.5°/sec.,
3°/sec., 6.5°/sec. |
RA and
Dec: 0.01x to 1.0x sidereal, variable in 0.01x increments;
2x, 8x, 16x, 64x, 128x sidereal; 1°/sec. to 8°/sec.,
variable in 0.1° increments |
RA and
Dec: 0.01x to 1.0x sidereal, variable in 0.01x increments;
2x, 8x, 16x, 64x, 128x sidereal; 1°/sec. to 8°/sec.,
variable in 0.1° increments |
| Tracking
Rates |
sidereal,
lunar, or custom-selected from 2000 incremental rates |
sidereal,
lunar, or custom-selected from 2000 incremental rates |
sidereal,
lunar, or custom-selected from 2000 incremental rates |
|
| Materials:
|
| Tube
Body |
aluminum |
aluminum
|
aluminum |
| Mount
Casting |
aluminum |
aluminum |
aluminum |
| Primary,
Secondary Mirror [Note 2] |
Pyrex®
glass |
Pyrex®
glass |
Pyrex®
glass |
| Correcting
Plate/Lens |
clear
float glass |
BK7
optical glass |
clear
float glass |
|
| Telescope
Dimensions, swung down |
9.25"
x 17" x 24.75" |
9.25"
x 17" x 34" |
9.25"
x 17" x 24.75" (8"); 12" x 20" x
31" (10") |
|
| Shipping
Carton Dimensions |
21"
x 30" x 14" |
38"
x 22" x 14" |
31"
x 22" x 14" (8"); 38" x 26" x 18"
(10") |
|
| Total
Net Telescope Weight |
53 lbs. |
84 lbs. |
73 lbs
(8"); 90 lbs.(10") |
|
| Heaviest
Sub-Section for Field Assembly |
33 lbs. |
56 lbs. |
45 lbs.
(8"); 62 lbs. (10") |
|
| Total
Shipping Weight (approx.) |
73 lbs. |
109
lbs. |
94 lbs.
(8"); 122 lbs. (10") |
|
| #1220
Field De-rotater |
— |
optional |
optional |
|
| Equatorial
Wedge Latitude Range |
23°
to 64° |
23°
to 64° |
23°
to 64° (8"); 24° to 65° Superwedge (10") |
|
| Field
Tripod Height [Note 3] |
30"
to 44" variable |
30"
to 44" variable |
30"
to 44" variable |
