System information

Vicon MX Hardware System Reference C-1

CMX Camera Lens Focusing

MX and MX+ cameras are in focus when the images of markers seen

by the camera at a distance representative of the capture distance

(i.e. the distance between subject and camera) are clear and sharp.

The degree of focus of the lens on an MX camera can be controlled

by altering two characteristics of the lens:

• Front (or forward) focus

This is set by adjusting the focus ring at the front of the lens. This

procedure is described in section Adjusting Camera Lens Focus

with Front Focus Ring on page C-2.

•Back focus

This is set by adjusting the position of the entire lens closer to or

further away from the camera sensor along the axis of the lens.

This procedure is described in section Adjusting Camera Lens

Focus through Back Focus on page C-6.

All cameras supplied by Vicon Motion Systems are back focused as

part of system testing in the factory; this should not normally need

to be repeated in the field. If small adjustments (trimming) of focus

are necessary in the field, generally you should use the lens front

focus method. However, if a supplied camera lens has been loosened,

removed, or swapped for another lens, it may be necessary to

perform a back focus adjustment for maximum performance.

In Vicon MX systems, focusing is typically done while viewing

grayscale data for markers in the Vicon application software. If

desired, you can connect a VGA monitor to the VGA Monitor output

on the back of the MX camera and switch it to monitor mode to

provide a secondary visualization of the image seen by the camera.

For details on using a VGA Monitor, see Chapter 3 MX Cameras.

MXhardware_Reference.book Page 1 Thursday, September 7, 2006 11:36 AM