BAUSCH & LOMB (CRITERION) 4000, 6000, and 8000 SERIES SCT

We offer knobs for the B&L Criterion 4000, 6000, and 8000 Schmidt-Cassegrain secondary. Select knobs for your telescope from the list below. Price is for a complete set of knobs.

A. Knobs for B&L (Criterion) 4000 Secondary
4k

Part: B&L4k
Fits: Bausch & Lomb 4000 series

Knobs: Black plastic, 9.5 mm (3/8”) diameter
Threads: Stainless steel

Notes:
  1. The factory dust cover will fit properly with Bob’s Knobs installed.
  2. This secondary has a central screw. It is not a collimation screw so it should not be adjusted.

$20.95

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B. Knobs for B&L (Criterion) 6000 Secondary
6k

Part: B&L6k
Fits: Bausch & Lomb 6000 series

Knobs: Black plastic, 9.5 mm (3/8”) diameter
Threads: Stainless steel

Notes:
  1. The factory dust cover will fit properly with Bob’s Knobs installed.
  2. This secondary does not have a central screw.

$20.95

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C. Knobs for B&L (Criterion) 8000 Secondary
8k

Part: B&L8k
Fits: Bausch & Lomb 8000 series (includes 8001)

Knobs: Black plastic, 15 mm (5/8”) diameter
Threads: Stainless steel

Notes:
  1. The factory dust cover will fit properly with Bob’s Knobs installed.
  2. This secondary does not have a central screw.

$22.95