For example, OPTI has a built-in Optiflow Sensor (a downward facing sensor), which functions by picking out the patterns on the ground to ensure that the drone maintains a straight position.  ATTI, conversely, works a bit differently. With the ATTI, the drone employs other techniques apart from the external sensors to keep the drone in the right orientation and altitude. Thus, the drone can hover in place, or drift slightly around with the wind serving as a push. You will also find a GPS in some drones, and they help the drone to maintain coordinated and precise flights and landings.
For both DJI drones, it's not necessary to go into depth about the basic functions, like take off, landing and navigating. You pay a premium, but these are definitely the top drones in the sky both because of their ease of use and extra features. On one battery, the Mavic flew for 21 minutes, in many different modes, speeds, and altitudes. The Tap to Fly feature on the Mavic was the biggest disappointment. The remote screen is too vague to simply place your finger where you want to go.
Tello has a range of just over 300 feet, and despite its size, it produces stable and clear videos, courtesy of its dual antenna transmission. You can get a 720p HD quality video with 30 frames per second, and conveniently capture stills of up to five megapixels. Unfortunately, users can only save the recorded videos on the smartphone and not on a memory card. While you can access these clips almost instantly, it takes up all the space on your phone.
It can take aerial shots with the altitude hold function, accessed by releasing the throttle. The drone hovers in place to get the shot. If you’re first starting out, you can operate it in headless mode to get a better idea of what it can do. It has a one-key return, and you can even perform aerial tricks and flips once you’ve mastered necessary controls.
If you’re looking for quality, the Inspire 2 is the best camera drone you can buy that comes ready to fly out of the box. The next best option is the Phantom 4 Pro and after that, the Mavic Pro. If you’re concerned about video quality, just pick one of the three drones mentioned above (which ever one matches your price point) and you’ll be more than satisfied. There are really no other drones that come close to what these three can do. Some people who shoot videos for a living will buy the Mavic Pro, Phantom 4 Pro, and the Inspire 2, because each of them can be useful for different situations.
Many manufacturers mount cameras inside the body of the drone. This is acceptable for casual photography, but if you want more professional results, consider adding an external camera mount, or gimbal. Gimbals allow you to place your video or still camera in front of the drone body, away from the vibrating motor and rotors. Gimbals can swivel and pivot, providing you with additional control over your imagery.

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