Meade ETX125 Instruction Manual - Page 47

Specifications

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SPECIFICATIONS Specifications: ETX-90PE Astro Telescope Optical design Maksutov-Cassegrain Primary mirror diameter 96mm (3.78") Clear aperture 90mm (3.5") Focal length 1250mm Focal ratio (photographic speed f/13.8 Near focus (approx 11.5 ft (3.5m) Resolving power 1.3 arc secs Super multi-coatings (EMC standard Limiting visual stellar magnitude (approx 11.7 Image scale 1.16°/inch Maximum practical visual power 325X Optical tube dimensions (dia. x length 10.4cm x 27.9cm (4.1" x 11") Secondary mirror obstruction (dia.; %) . . 27.9mm (1.1"); 9.6% Telescope mounting fork type; double tine Setting circle diameters Dec.: 3.5"; R.A.: 7" SmartFinder Red dot projected onto finder's lens LNT Module High accuracy, temperature-compensated oscillator, updatable using Meade's optional ATUM accessory Input voltage 12 volts DC Motor Drive System DC servo motors with encoders, both axes Bearings: Altitude UHMW polyethylene Azimuth PTFE Materials: Tube body aluminum Mounting high-impact ABS, aluminum-reinforced Correcting lens BK7 optical glass, Grade-A Telescope dimensions 38cm x 18cm x 22cm (15" x 7" x 9") Telescope net weight: (incl. AutoStar & batteries 3.5kg (7.8 lbs) Telescope shipping weight 5.8kg (12.8 lbs) Battery Life (approx.): with AutoStar 20 hrs 47

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47
SPECIFICATIONS
Specifications:
ETX-90PE Astro Telescope
Optical design
. . . . . . . . . . . . . . . . . . . . Maksutov-Cassegrain
Primary mirror diameter
. . . . . . . . . . . . . . . . . . . 96mm (3.78”)
Clear aperture. . . . . . . . . . . . . . . . . . . . . . . . . . . . 90mm (3.5”)
Focal length
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250mm
Focal ratio (photographic speed). . . . . . . . . . . . . . . . . . . f/13.8
Near focus (approx)
. . . . . . . . . . . . . . . . . . . . . . 11.5 ft (3.5m)
Resolving power . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 arc secs
Super multi-coatings (EMC) . . . . . . . . . . . . . . . . . . . . standard
Limiting visual stellar magnitude (approx.)
. . . . . . . . . . . . 11.7
Image scale
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.16°/inch
Maximum practical visual power
. . . . . . . . . . . . . . . . . . . 325X
Optical tube dimensions
(dia. x length) . . . . . . . . . . . 10.4cm x 27.9cm (4.1” x 11”)
Secondary mirror obstruction (dia.; %) . . 27.9mm (1.1”); 9.6%
Telescope mounting . . . . . . . . . . . . . . . . fork type; double tine
Setting circle diameters
. . . . . . . . . . . . . . . Dec.: 3.5”; R.A.: 7”
SmartFinder. . . . . . . . . . . Red dot projected onto finder’s lens
LNT Module . . . . . . High accuracy, temperature-compensated
. . . . . . . . . . . . . . . . . oscillator, updatable using Meade’s
. . . . . . . . . . . . . . . . . . . . . . . . optional ATUM accessory
Input voltage
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 volts DC
Motor Drive System
DC servo motors
with encoders, both axes
Bearings:
Altitude . . . . . . . . . . . . . . . . . . . . . . . UHMW polyethylene
Azimuth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PTFE
Materials:
Tube body. . . . . . . . . . . . . . . . . . . . . . . . . . . . . aluminum
Mounting
. . . . . . high-impact ABS, aluminum-reinforced
Correcting lens . . . . . . . . . . . BK7 optical glass, Grade-A
Telescope dimensions:
. . . . . . . . . . . . . . . . 38cm x 18cm x 22cm (15” x 7” x 9”)
Telescope net weight:
(incl. AutoStar & batteries) . . . . . . . . . . . . 3.5kg (7.8 lbs)
Telescope shipping weight. . . . . . . . . . . . . . . . 5.8kg (12.8 lbs)
Battery Life (approx.):
with AutoStar
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 hrs