Bobs Knobs - KNOBS FOR CELESTRON 8 inch (20 cm) f/10 SCT WITH STANDARD COLLIMATION SCREW THREADS

COLLIMATE YOUR SCHMIDT-CASSEGRAIN STYLE OR NEWTONIAN STYLE TELESCOPE WITHOUT TOOLS

It′s easy . . . just grab a Bob′s Knob and turn. You can even do it while looking
through the eyepiece on most scopes. And 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.

Fits: Celestron 8 inch (20 cm) f/10 SCT with factory Allen,  silver Phillips, or headless
set-style 6-32 collimation screws, with or without Fastar compatible secondary (C8 orange, black,
or gray; Ultima 2000; NexStar 8). Will not fit scopes with black Phillips factory collimation
screws.

Knobs: Black plastic, 13 mm (1/2 inch) diameter

Threads: Black anodized aluminum alloy

Note1: These knobs will fit all C8 models made prior to 2005, and all 2005 and later
models EXCEPT those with black Phillips factory collimation screws. The black-screw model
requires C8 metric knobs. Check that our screw threads match the factory screw threads before
installing.

Note2: The factory dust cover will fit normally with Bob′s Knobs installed.


b>Note3: Some telescope versions have a small plastic cover over the factory collimation
screws. This cover must be removed and set aside when Bob′s Knobs are installed. The cover
is cosmetic only and will not affect operation of the scope.

Note4: We provide spacers for knobs installed on the Fastar compatible secondary to raise
the knobs slightly for easier use. These spacers can be optionally used on other models with
Allen or Phillips factory collimation screws to raise the knobs for easier access, but check that
the full-aperture dust cover fits without contacting the knobs. Spacers should not be used on
telescopes with set-style factory collimation screws.