For a 19 mm lens, if the IFOV is 0.895 MRAD, is it telephoto or wide IFOV?

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Multiple Choice

For a 19 mm lens, if the IFOV is 0.895 MRAD, is it telephoto or wide IFOV?

Explanation:
The key idea is how IFOV describes how much of the scene each pixel sees. A smaller IFOV means more magnification and a narrower field captured per pixel, which is the telltale sign of telephoto optics. Here, the lens is 19 mm and the IFOV is 0.895 mrad, which is less than 1 mrad. In this course’s terms, that smaller-than-1 mrad value indicates a telephoto configuration, not a wide one. A wide IFOV would have an IFOV greater than about 1 mrad, meaning each pixel covers more of the scene but with less detail per pixel. So this setup is telephoto because the per-pixel view is a narrow angle, giving more magnification at distance.

The key idea is how IFOV describes how much of the scene each pixel sees. A smaller IFOV means more magnification and a narrower field captured per pixel, which is the telltale sign of telephoto optics. Here, the lens is 19 mm and the IFOV is 0.895 mrad, which is less than 1 mrad. In this course’s terms, that smaller-than-1 mrad value indicates a telephoto configuration, not a wide one. A wide IFOV would have an IFOV greater than about 1 mrad, meaning each pixel covers more of the scene but with less detail per pixel. So this setup is telephoto because the per-pixel view is a narrow angle, giving more magnification at distance.

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