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OGS Classical Cassegrain 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/15 f/16 f/16 f/14.25 f/16 f/16 f/10
Secondary Dia. 3.00" 3.50" 4.00" 4.25" 5.00" 6.00" 8.50"
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 Overall Length 40" 45" 54" 54" 72" 84" 82"
Weight 35 lbs. 55 lbs. 85 lbs. 95 lbs. 160 lbs. 230 lbs. 350 lbs.
Focuser Tube I.D. 2.5" 2.5" 2.5" 2.5" 4.2" *** 4.2" *** 4.2" ***
OGS** Mounting HP50 HP75 HP75 HP75 OGS75 OGS140 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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