Lenses Selection and Setup - Part 4

Published on June 20, 2008

Please Note: This blog post is part of a series of five posts altogether.
The posts include: Part 1, Part 2, Part 3, Part 4 and Part 5.

Step 4: Setup

In the field of digital image processing, we have a standardized lens mount with two variants: C mount and CS mount. This leads to four combinations (see image on the right), one of which does not work: CS mount lenses can not be used with C mount cameras.

If you, on the other hand, would like to attach a C mount lens to a CS mount camera previously simply screw a 5 mm extension ring into the camera.

If Step 3 (How to deal with very small working distances) should have turned out to require an additional extension ring, simply put it between the camera and the lens (like a grommet).

Please note: The Imaging Source exclusively manufactures CS mount cameras. Each of the cameras is shipped with a 5 mm extension ring.

Special case: Wide-Angle Lenses

Very large objects and/or small working distances often force us to use lenses with very small focal lengths. The following example depicts the selection of such wide-angle lenses:

Waste sorting:

  • Object width = 700 mm
  • Working distance = 500 mm
  • CCD format = 1/4" (CCD width = 3.2 mm)

In this case the focal length is 2.3 mm and thus one of the lowest commercially available. Therefore, we use the Computar T 2314 FICS-3 (see table below).

Computar wide-angle lenses are used for applications which require the lowest focal lengths.

Please note: These lenses are only available as CS mount versions and therefore can not be used with C mount cameras.

Please note: The optical quality of wide-angle lenses falls short of the quality of "normal" lenses. This may be a crucial point in the context of visualization purposes and/or customer presentations since a bad image quality often rubs off on the complete system.

To be continued...

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Post published by TIS Marketing on June 20, 2008.

About The Imaging Source

Established in 1990, The Imaging Source is one of the leading manufacturers of industrial cameras, frame grabbers and video converters for production automation, quality assurance, logistics, medicine, science and security.

Our comprehensive range of cameras with USB 3.1, USB 3.0, USB 2.0, GigE interfaces and other innovative machine vision products are renowned for their high quality and ability to meet the performance requirements of demanding applications.

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