Which statement correctly describes MFOV?

• A. It is the area covered by the entire image sensor
• B. It is the shortest distance to the target
• C. It is the smallest area that can be measured
• D. It is the distance to the target

Answer: (C)

MFOV represents the smallest footprint on the target that the system can reliably measure. It describes the tiniest area the optics and detector can resolve and assign a temperature to at a given distance. This matters because any target area smaller than MFOV will be averaged over the footprint, reducing spatial detail and measurement precision. It’s not the area of the entire sensor’s view, nor the distance to the target itself. For example, if MFOV is 5 mm at your working distance, you can’t reliably measure a feature smaller than about 5 mm without adjusting distance or magnification.