Bob's Knobs for GSO made 12" Ritchey-Chretien Secondary (Astro-Tech, TPO, Apertura...
Ships by Next Business Day
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
Collimate your Catadioptric or Newtonian reflector style telescopes without tools!
It's easy...just grab a Bob's Knob collimation thumbscrew and turn. You can even do it while looking through the eyepiece on most scopes. These thumbscrews are also much easier to use with gloves on. And perhaps most importantly, you'll never drop that pesky little Allen wrench or screwdriver into the grass again. Installation is a snap with the included instructions, and you can undo the modification at any time.
Part: AT12RC
Fits: Astro-Tech, GSO, iOptron, MallinCam, Orion (US), and TPO 12" f/8 RCT secondary (solid or truss-tube).
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- The factory dust cover will fit normally with Bob's Knobs installed.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Collimate your Catadioptric or Newtonian reflector style telescopes without tools!
It's easy...just grab a Bob's Knob collimation thumbscrew and turn. You can even do it while looking through the eyepiece on most scopes. These thumbscrews are also much easier to use with gloves on. And perhaps most importantly, you'll never drop that pesky little Allen wrench or screwdriver into the grass again. Installation is a snap with the included instructions, and you can undo the modification at any time.
Part: AT12RC
Fits: Astro-Tech, GSO, iOptron, MallinCam, Orion (US), and TPO 12" f/8 RCT secondary (solid or truss-tube).
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- The factory dust cover will fit normally with Bob's Knobs installed.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Bob's Knobs for GSO made 12" Ritchey-Chretien Secondary (Astro-Tech, TPO, Apertura, Orion, iOptron) # AT12RC