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ORION OPTICS (UK) OD-SERIES AND CT-SERIES
We offer knobs for the Orion Optics OD-series and CT-series secondary in two different screw lengths. (Orion Optics in the United Kingdom and Orion in the US are two different companies.) Use our guidelines to determine the correct screw length.
A. Knobs for Orion Optics OD and CT Secondary
Part: ODsec35 or ODsec45
Fits: Orion (UK) OD-series secondary
Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel (35 mm length); Zinc-plated steel (45 mm length)