Orion 8958 Care and Cleaning of the Optics, SpecificationsSpecifications, 6 f/9 Ritchey-Chrétien

Care and Cleaning of the Optics

Do not disassemble the Ritchey-Chrétien for any reason, including to clean the mirror. A small amount of dust and par- ticulates on the mirror’s surface will not affect performance. In

the event internal cleaning is necessary the telescope should be shipped to Orion Telescopes and Binoculars for service. This telescope does not contain user-servicable parts and disassembly of the components will void the warranty. When not in use, please use the supplied dust cap(s) to keep dust and particulates out of the tube and off the optics.

SpecificationsSpecifications:

6" f/9 Ritchey-Chrétien		8" f/8 Ritchey-Chrétien
Optical configuration	Ritchey-Chrétien	Optical configuration	Ritchey-Chrétien
Figure	Hyperbolic	Figure	Hyperbolic
Mirror material	BK-7	Mirror material	BK-7
Mirror Coating	Enhanced, no less than	Mirror Coating	Enhanced, no less than
	94% with SiO2 Overcoat		94% with SiO2 Overcoat
Focuser	Machined Aluminum	Focuser	Machined Aluminum
	Dual‑Speed (10:1) Linear		Dual‑Speed (10:1) Linear
	Bearing Crayford		Bearing Crayford
Accessories	Accepts 2" & 1.25"	Accessories	Accepts 2" & 1.25"
Baffles	8 knife-edge baffles	Baffles	10 knife-edge baffles
Optical Tube	Steel	Optical Tube	Steel
Aperture	150mm (6”)	Aperture	200mm (8")
Focal Length	1370 mm	Focal Length	1600mm
Focal Ratio	f/9	Focal Ratio	f/8
Secondary Mirror Minor Axis	67mm	Secondary Mirror Minor Axis	90mm
Length	406mm	Length	476mm
Diameter	193mm	Diameter	230mm
Weight	12.4 lbs.	Weight	15.9 lbs

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