Orion #8297 8" F/3.9 - Manual (Page 12)

4. Specifications
Orion 8" f/3.9 Newtonian Astrograph
Optical configuration: Newtonian reflector
Aperture: 203mm
Focal length:
800mm
Focal ratio: f/3.9
Primary mirror: Low thermal expansion optical glass,
parabolic figure
Mirror coatings: Enhanced aluminum (94%
reflectivity) with SiO
2
overcoat
Secondary mirror
minor axis:
70mm
Focuser: Dual-speed (11:1) 2" Crayford,
accepts 2" accessories
Drawtube travel: 38mm
Optical tube: Rolled steel, gloss enamel exterior
finish
Tube baffles: 9
Weight: 17.5 lbs. – without tube rings, fan,
finder scope, 1.25" eyepiece holder
21.6 lbs. – with tube rings, finder
scope, 1.25" eyepiece holder
Length: 30.25"
Tube rings:
Included, hinged, felt-lined
Finder Scope: 9x50, with spring-loaded X-Y
dovetail bracket
2" Extension adapters: 30mm and 36mm extension length
Orion 10" f/3.9 Newtonian Astrograph
Optical configuration: Newtonian reflector
Aperture: 254mm
Focal length:
1000mm
Focal ratio: f/3.9
Primary mirror: Low thermal expansion optical glass,
parabolic figure
Mirror coatings: Enhanced aluminum (94%
reflectivity) with SiO2 overcoat
Secondary
mirror minor axis:
82mm
Focuser: Dual-speed (11:1) 2" Crayford,
accepts 2" accessories
Drawtube travel: 38mm
Optical tube: Rolled steel, gloss enamel exterior
finish
Tube baffles: 13
Weight: 25.5 lbs. – without tube rings, fan,
finder scope, 1.25" eyepiece holder
30.2 lbs. – with tube rings, finder
scope, 1.25" eyepiece holder
Length: 38.6"
Tube rings:
Included, hinged, felt-lined
Finder Scope: 9x50, with spring-loaded X-Y
dovetail bracket
2" Extension adapters: 30mm and 36mm extension length
Orion Telescopes & Binoculars
OrionTelescopes.com
89 Hangar Way, Watsonville CA 95076
Customer Support Help Line (800) 676-1343
© 2011 Orion Telescopes & Binoculars
One-Year Limited Warranty
The Orion 8" and 10" f/3.9 Newtonian Astrographs are warranted against defects in materials or workmanship for a period of one
year from the date of purchase. This warranty is for the benefit of the original retail purchaser only. During this warranty period Orion
Telescopes & Binoculars will repair or replace, at Orion’s option, any warranted instrument that proves to be defective, provided it is
returned postage paid to: Orion Warranty Repair, 89 Hangar Way, Watsonville, CA 95076. Proof of purchase (such as a copy of the
original receipt) is required.
This warranty does not apply if, in Orion’s judgment, the instrument has been abused, mishandled, or modified, nor does it apply
to normal wear and tear. This warranty gives you specific legal rights, and you may also have other rights, which vary from state to
state. For further warranty service information, contact: Orion Customer Service (800) 676-1343; [email protected].