Computar Lenses
An extension ring attaches between the lens and the camera. The 0.5mm extension adapts C-mount lens to CS-mount cameras. Combinations of extension tubes can be used to reduce the minimum focusing distance. The kit contains 1 each: 0.5 mm, 1.0 mm, 5.0 mm, 10.0 mm, 20.0 mm, 40.0 mm spacers.
$10.00, 10 for $99.00 Spacer Thickness code
EXT
Computar 55mm Telecentric Lens Specification
Telecentric lenses provide constant magnification over a wide range of working distances making them ideal for doing the critical measurements often found in machine vision applications. These lenses can be provided with multipiliers installed. C-mount.
$355.00 Multiplier code

 TEC-M55-XXX
Computar Lens Accessories

Extension rings, View Finder, and Polarizing Filters.
Computar Mega-Pixel Lenses  Computar mega-pixel lenses are specifically
designed for mega-pixel cameras. The higher quality optics allows full imaging use of
the higher resolution cameras. Recommended for cameras with greater than 1
mega-pixel.resolution.
Computar Monofocal Lenses
SensorSmart Technologies, Inc.