Orion 9791 instruction manual Specifications, Optical Tube Assembly OTA, Mount, Accessories

Page 33

7. Specifications

Optical Tube Assembly (OTA)

Primary mirror:

356mm (14.0") diameter

 

reflective surface, low thermal

 

expansion optical glass,

 

parabolic, center marked

Focal length:

1650mm

Focal ratio:

f/4.6

Primary mirror cell:

18-point flotation, 3 spring-

 

loaded collimation knobs

Secondary mirror:

80mm minor axis, low thermal

 

expansion optical glass

Secondary mirror holder:

4-vane spider assembly, 0.7mm

 

thick spider vanes, 3 SHCS for

 

tilt adjustment

Mirror coatings:

Enhanced reflectivity (94%)

 

aluminum with SiO2 overcoat

Focuser:

Dual speed Crayford, 11:1

 

fine focus knob, accepts 2"

 

and 1.25" eyepieces, all metal

 

construction

Optical tube design:

Truss tube

Truss poles:

8 total (4 truss pole assembles

 

with 2 poles each), 1.0" outer

 

diameter, aluminum black

 

anodized, captive assembly

 

hardware

Navigation knob:

Included

Optical tube material:

Rolled steel, 1.0mm thick

Tube outer diameter:

412mm (16.2")

OTA weight, assembled:

69.25 lbs.

OTA weight, disassembled: Lower tube section, 52.9 lbs. Upper tube section, 9.4 lbs. Truss pole assemblies, 6.9 lbs.

OTA length, assembled:

61"

OTA length, disassembled: Lower tube section, 21.75" long; Upper tube section, 8.1" long; Truss pole assemblies, 33.75" long

Mount

 

Dobsonian base:

Collapsible design,

 

CorrecTension altitude

 

tensioning, side brace supports,

 

carry handle

Azimuth bearing material:

Virgin Teflon on Ebony Star

 

laminate

Altitude bearing material:

Ultra-high molecular weight

 

(UHMW) polyethylene on ABS

 

plastic

Altitude bearing diameter:

8.0"

IntelliScope functionality:

Computerized Object Locator

 

system included, 14,000+

 

object database

Base weight:

45 lbs., assembled

Approximate base

 

dimensions:

29" diameter x 27" tall

Accessories

 

2" Eyepiece:

35mm Deep View, 2", multi-

 

coated, threaded for Orion filters

1.25" Eyepiece:

10mm Sirius Plössl, 1.25",

 

multi-coated, threaded for Orion

 

filters

Eyepiece magnifications:

47.1x and 165x

Finder scope:

9x power, 50mm aperture,

 

achromatic, crosshairs, 5° field

 

of view

Finder scope bracket:

Spring-loaded X-Y adjustment,

 

dovetail base

Eyepiece rack:

Holds three 1.25" eyepieces

 

and one 2" eyepiece

Cooling accelerator fan:

Included, runs off of 12V DC

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Contents #9791 Orion SkyQuest IntelliScope Truss Tube DobsonianSkyQuest XX14i IntelliScope Truss Tube Dobsonian Unpacking Table ContentsNavigation Knob Counterweights Box #1A IntelliScope Object Locator Kit refer to Figure Parts ListBox #3 Dobsonian Base refer to Qty. Description Box #2 Primary Mirror and Cell refer to FigureTop baseplate Assembly Assembly of the Dobsonian BaseBox #4 Truss poles refer to Figure Exploded view of the XX14i base Azimuth encoder board Brass azimuth Bushing Nylon spacer Assembly of the Optical Tube Page Ring Connector Truss poles Mounting the Optical Tube on Dobsonian Base Installing the Finder Scope and Eyepieces Adapter Thumb screws Coarse Focus Collimation Cap Aligning Collimating the Optical SystemPrimary Mirror Center Mark Preparing the Telescope for CollimatingAdjusting the Secondary Mirror’s Axial Position Adjusting the Secondary Mirror’s Radial PositionAligning the Secondary Mirror Adjusting the Secondary Mirror’s Tilt Adjusting the Secondary Mirror’s Rotational PositionStar-Testing the Telescope Aligning the Primary MirrorUsing Your Telescope Setting the Altitude TensionAltitude and Azimuth Motion Focusing the Telescope Viewing with EyeglassesAligning the Finder Scope Aiming/Pointing the Telescope Focusing the Finder ScopeMagnification 1650mmDisassembly of the Base Disassembly of the Optical TubeTube Balance Disassembling the Telescope for TransportIntelliScope Computerized Object Locator Astronomical ObservingSelecting an Observing Site Use of the Optional Light ShroudSeeing and Transparency Cooling the Telescope Let Your Eyes Dark-AdaptEyepiece Selection Moon Astronomical ObjectsCare and Maintenance Cleaning Eyepiece LensesCleaning Mirrors Page Optical Tube Assembly OTA SpecificationsAccessories MountOne-Year Limited Warranty
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