About this product
Part Number: AT16RC
Replacement collimation knobs for iOptron / Astro-Tech / GSO / Orion / TPO 16" RC Series telescopes.
Bob's Knobs are the BEST option for tool-free collimation.
Simple to fit and easy to use.
Collimate your telescope without an Allen key or screwdriver!
Instructions are supplied but can also be found online as well as useful FAQ.
Images are representative and may not show the exact knob size / threads.
IMPORTANT: Please ensure the Bob's knobs threads and factory screw threads match before installation.
Knobs for iOptron / Astro-Tech / GSO / Orion / TPO 16" f/8 Ritchey-Crétien Truss-Tube SecondaryPart:
Astro-Tech, GSO, Orion (US), and TPO 16" f/8 RCT truss-tube secondaryKnobs:
Black plastic, 16 mm (5/8”) diameterThreads:
Please fill in the form below to ask a question or request a price match.