We offer knobs for the GSO 6”, 8”, 10”, and 12” Ritchey-Crétien secondary. Select knobs for your telescope from the list below.
A. Knobs for GSO 6” and 8” Ritchey-Crétien Secondary
Part: AT8RC
Fits: GSO 6” RC and 8” RC secondary
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- The factory dust cover will fit normally with Bob’s Knobs installed.
$25.95
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B. Knobs for GSO 10” Ritchey-Crétien Secondary
Part: AT10RC
Fits: GSO 10” RC secondary
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- The factory dust cover may contact the knobs when installed, but the cover will remain in place. If desired, a shower cap can be used as a substitute cover.
$25.95
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C. Knobs for GSO 12” Ritchey-Crétien Secondary
Part: AT12RC
Fits: GSO 12” RC secondary
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- The factory dust cover will fit normally with Bob’s Knobs installed.
$25.95