Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC)

Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary

Fits: Astro-Tech, GSO, iOptron, MallinCam, Orion (US), and TPO 6" f/9 RCT secondary (solid or truss-tube)

Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel

• If the dust cover cannot be installed because of knob height, you can use a shower cap in its place.

In the Box

Bob's Knobs for Astro-Tech 6" f/9 Ritchey-Crétien Secondary