Bob's Knobs

Collimation Thumbscrews

BOB'S KNOBS FOR CATADIOPTRIC TELESCOPES (Schmidt-Cassegrain, Maksutov-Cassegrain, and variants)

Astro-Tech

Ritchey-Crétien series

Bausch & Lomb (Criterion)

4000/6000/8000 series

Celestron SCT

5" (12.5 cm)
6" (15 cm)
8" (20 cm)
9.25" (23.5 cm)
11" (27.5 cm)
14" (35 cm)

GSO

Ritchey-Crétien series

Intes

MK series

Intes-Micro

IM series

Meade SCT

6" (15 cm)
8" (20 cm)
10" (25 cm)
12" (30 cm)
14" (35 cm)
16" (40 cm)

OPT TPO

Ritchey-Crétien series

Orion (US)

Argonaut 150
Ritchey-Crétien Series
8" by Celestron
9.25" by Celestron
11" by Celestron

Takahashi

TSC-225
Mewlon

Vixen

VC series
VMC series

SCT