The VISUO ZEN K1 drone offers a 4K camera and 50x zoom at 60km/h with half-hour flight time, at a bargain price (currently around $170). One can say that it is an average folding black drone. It also comes with a remote control that serves as a phone display, so if you want to watch the camera image, you will need a phone.
4K camera comes with 50x zoom and camera image can be viewed on the phone in real time. Video Resolution: Video Resolution: 2048 X 1088 pixels. Image Resolution: 4096 X 3072 pixels. At the bottom there is also a secondary camera (“optical flow”), which not only aids in navigation, but also the image of that camera.