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OGS Ritchey-Chrétien Optical Tube Assembly Specifications

Model RC-10 RC-12.5 RC-14.5 RC-16 RC-20 RC-24 RC-32
Clear Aperture 10.0" 12.5" 14.5" 16.0" 20.0" 24.0" 32.0"
f-No. f/8.5 f/9 f/7.9 f/8.4 f/8.1 f/8 f/7.6
Secondary Dia. 4.00" 4.50" 5.50" 6.00" 7.25" 8.50" 12.25"
Back Focus * 9.75 9.25 9.00 10.00 10.5 11.5 12.5
Tube Dia. 12" 15.5" 18" 19.5" 24.5" 29" 39"
Tube Length 27" 36" 40" 46" 54" 64" 78"
Weight 30 lbs. 50 lbs. 70 lbs. 85 lbs. 150 lbs. 210 lbs. 340 lbs.
Focuser Tube I.D. 2.5" 2.5" 2.5" 2.5" 4.2" *** 4.2" *** 4.2" ***
OGS** Mounting HP50 HP50 HP75 HP75 OGS75 OGS100 OGS140

* Back Focus as measured from the rear mounting plate of telescope.
** Minimum suggested mounting requirement.
*** Electronic secondary focus is included (optional on other models.)
(All specifications are nominal measurements and subject to change without notice.)

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