Here is a tiny camera designed to be mounted to your drone. The RunCam Thumb Pro 4K has a 150-degree field of view. It also weighs 16g, which makes it ideal for quadcopters. It has gyroflow stabilization for silky smooth video.
This camera lets you change resolution, saturation, and exposure through the RunCam app by scanning a QR code. It supports horizontal and vertical viewing. This camera has a replaceable ND filter.