We offer knobs for the Sharpstar 15028HNT Hyperbolic Newtonian primary and secondary. Please read the notes for important information. Select the type of knobs for your telescope from the list below. Price is for a complete set of knobs.
A. Knobs for Sharpstar 15028HNT Primary
Part: SPSTpri
Fits: Sharpstar 15028HNT telescopes.
Primary collimation
- Knobs: Black plastic, 16 mm (5/8”) diameter
- Threads: Stainless steel
- Knobs: Red plastic, 16 mm (5/8”) diameter
- Threads: Stainless steel
- Black knobs with spacers replace the factory collimation adjust screws with larger heads. Red knobs replace the factory set-style (grub) lock screws.
- Each factory collimation adjust screw passes through a spring. Keep the telescope vertical (pointed at the zenith) during knob installation so the spring doesn't move out of position, and exchange screws with knobs one at a time. If necessary, remove the mirror cell to reposition the spring.
$27.95
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B. Knobs for Sharpstar 15028HNT Secondary
Part: SPSTsec
Fits: Sharpstar 15028HNT telescopes.
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- The factory dust cover will no longer fit onto the OTA after secondary knobs are installed due to lack of clearance. A shower cap can be substituted if desired, or the dust cover can be omitted altogether if the telescope is stored in an enclosed case