https://www.counteruavradar.com/en/tags/focal-length/ Recent content in Focal Length on Counter UAV Radar — Low-Altitude Surveillance Radar Hugo en-US Sat, 28 Mar 2026 22:30:00 +0800 https://www.counteruavradar.com/en/knowledge-base/how-to-choose-focal-length-for-long-range-surveillance/ Tue, 22 Sep 2026 00:00:00 +0000 https://www.counteruavradar.com/en/knowledge-base/how-to-choose-focal-length-for-long-range-surveillance/ <p>Choosing focal length for long-range surveillance is often framed as a simple zoom decision. In practice, it is a geometry decision. A longer focal length narrows the field of view, enlarges the target in the image, and changes how much of the scene one camera can own. That helps some surveillance tasks and hurts others.</p> <p>This is why the right question is not &ldquo;How much zoom do we want?&rdquo; The right question is &ldquo;What task must the camera perform at that distance, across what scene width, on what sensor, and under what stability conditions?&rdquo; Once those variables are stated clearly, focal length becomes much easier to choose.</p>