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Chapter 5 Operation 45
Imaging Field of View
When used for two-dimensional imaging applications, the MicroMAX camera closely
imitates a standard 35 mm camera. Since the CCD is not the same size as the film plane
of a 35 mm camera, the field of view at a given distance is somewhat different. The
imaging field of view is indicated in
Figure 15.
D
O
B
S
Object
Lens
CCD
Figure 15. Imaging Field of View
D = distance between the object and the CCD
B = 46.5 mm for F-mount; 17.5 mm for C-mount
F = focal length of lens
S = CCD horizontal or vertical dimension
O = horizontal or vertical field of view covered at a distance D
M = magnification
The field of view is:
RS-170 or CCIR Video
One of the limitations of scientific non-video rate cameras has been their difficulty in
focusing and locating fields of view. The MicroMAX solves this problem by its
combination of high speed operation with the implementation of true video output. The
high-speed image update on the video monitor (via the VIDEO BNC connector on the
rear of the Controller) makes focusing and field location as simple as with a video
camera. This video output also makes possible archiving an experiment on a VCR,
producing hardcopy data on a video printer, or even implementing autofocusing stages.
Note: If more than one device is connected to the video output, the last device is the one
that should to be terminated in 75Ω. For example, to connect the video output to a VCR
as well as to a monitor, the cable from the controller video output should be connected to
the video input connector of the VCR, and another 75 Ω cable should extend from the
video output connector of the VCR to the 75Ω input of the monitor. Do not use a BNC
TEE to connect the controller video output to multiple devices.
The video output is selected by the Application software. In the case of a WinX
application, this is done by
selecting Video from the Acquisition menu. There is also
provision in the WinX applications for intensity-scaling the video output, that is,
selecting the specific gray levels to be displayed on the 8-bit video output.