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.

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

Part: B&Lsec1
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

$20.95

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B. Knobs for B&L (Criterion) 6000 and 8000 Secondary

Part: B&Lsec2
Fits: Bausch & Lomb 6000 and 8000 series (includes 8001)

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