Bob's Knobs for Celestron SCT 8” Pre-1980 Orange Tube: Enhance Your Classic Telescope Tailored for Classic Celestron SCT 8" f/10: Specifically designed for pre-1980 Celestron 8” (20 cm) f/10 SCTs with the iconic orange optical tube and factory set-style (Allen or slotted) collimation screws. Part Information - Part: C8org: Telescope Suitability: Perfectly compatible with pre-1980 orange tube C8 models. Knob Design: Constructed from black plastic, each knob measures 13 mm (1/2”) in diameter, facilitating easy and precise adjustments. Thread Material: Features black anodized aluminum alloy threads for a secure and long-lasting fit. Special Features for Classic Models: Fits Pre-1980 Models: These knobs are tailored for the unique secondary setup of early orange tube C8 models. Secondary with Central Screw: The secondary housing includes a fourth central pivot screw (do not adjust this screw). Two Sets of Knobs Included: Varied Screw Lengths: Each order includes two sets of knobs with different screw lengths. Choose the length that best fits your telescope. Optimal Screw Length: Aim for two or three screw thread turns above the secondary housing, ensuring the dust cover fits without touching the knobs. Preserving Your Classic Telescope: Avoid Adjusting Pivot Screw: The central screw in the secondary is for pivoting purposes only and should not be adjusted. User-Friendly Collimation Solution: Ideal for owners of the classic Celestron SCT 8” orange tube, seeking an effortless, tool-free method for accurate collimation adjustments.
