Before you “solve” the camera motion, you need to tell Blender your camera parameters. Knowing the lens you used as well as other camera settings makes it easier for Blender to calculate perspective. In the Properties Region, you have the Camera and Lens panels where you can input information about the focal length you used to film the footage, as well as the camera sensor.
If you don’t know this information, no problem, Blender has a tool called Refine that will estimate that information for those situations; you’ll use it in the next section that covers solving the camera’s motion.
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