Chapter 4 Obtaining the Best Image
The Importance of Focusing
The focusing ability of the imager is similar to the one found on regular photographic cameras, and it is defined as the ability to adjust the optical system to capture the highest amount of infrared energy from the target, thus allowing the sharpest thermal image of the target to be displayed. Properly focusing the unit is of paramount importance for obtaining a crisp clear image. There is no way to compensate for an improperly focused thermal image afterwards.
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Focus Wheel
Figure 28. Locating the Focus Wheel
Focusing is accomplished by rotating the Focus Wheel in either direction. The minimum focusing distance is 61cm (24 inches). That means you have to be at least 61cm (24 inches) away from your target to get it focused.
Rotating the Focus Wheel to the leftmost position (as viewed from operator’s perspective) will focus the optics to the minimum focus distance of 61cm (24 inches) away from the unit. Rotating the Focus Wheel to the right, the optical system will gradually focus to longer distances. Rotating the Focus Wheel to the furthest right position will focus the optics at infinity.
To make sure your target is in focus, try starting with the Focus Wheel in the leftmost position, rotate slowly to the right, and stop when the image is at its sharpest. You may need to go back and forth until reaching the best focus adjustment. Alternately, you may move in and out while viewing a subject to determine where focus is best.
July 1, 2003 | - 41 - | Version 1.0 |
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