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24 NTE/CCD Detector Manual Version 2.A
Imaging Field of View
When used for two-dimensional imaging applications, PI CCD detectors closely imitate a
standard 35 mm detector. Since the CCD is not the same size as the film plane of a 35 mm
detector, the field of view at a given distance is somewhat different.
Princeton Instruments, Inc
D
O
B
S
Object
Lens
CCD
Figure 10. Imaging Field of View
D = distance between the object and the CCD (the CCD is 46.5 mm behind the front edge of
the Nikon lens adapter, 17.5 mm for the C-mount adapter)
B = 46.5 mm for the Nikon adapter, 17.5 mm for the C-mount adapter
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:
F-Mount Adapter Focusing Procedure
Note:
This procedure sets the focus for the F-mount adapter, not the lens. Once set, it
should not need to be disturbed again.
1.
The lens should be mounted to the detector as described in Chapter 2.
2.
Mount a suitable target at a known distance in front of the lens. Typically, a
photo resolution chart is used. However, even a page of small print will
generally serve quite well for this purpose.
3.
Try rotating the detector lens mount. If it doesn’t rotate, it will be necessary to
loosen the securing setscrews. The lens mount adjustment is secured by
setscrews. To change the focus setting, proceed as follows.
Remove the lens from the lens mount.
Loosen the two setscrews with a 0.050 Allen wrench
*
. Do not remove the
screws; loosen them just enough to allow the lens mount to be adjusted.
*
The screws are #4-40 setscrews. A 0.050 hex key is required to loosen or tighten them.