You should choose a drone that automatically returns when the battery is low, allowing you to avoid losing or crashing the device. This feature is called RTH for "return to home." Flight time can be as short as five minutes. It depends on the model. Most people will want at least 10 minutes of flight time. You can find models with a flight time as high as 35 minutes.
Video transmission is a vital aspect of aerial photography in that it transmits what the camera captures straight to your phone in real time. If video transmission is delayed or interfered with, you might find it difficult to control your drone’s HD camera, let alone store those carefully captured images. Advanced transmission systems support dual frequencies of both 2.4GHz and 5.8GHz for greater interference resistance, and have a long transmitting distance. 

The Anafi is a great drone for the price, but the biggest complaint I have by far is the lack of any sensors for obstacle avoidance. The only obstacle that this drone will stop you from hitting is the ground, that is, as long as you don’t hit a tree first. All of the other drones in this price range have some kind of obstacle avoidance, so why they couldn’t even add some IR sensors is beyond me.
With an average flight time of 34 minutes, you’ve got plenty of time to set up shots and capture epic video. The specs are impressive too, with the Mavic Air 2 delivering 4K/60fps video on a three-axis gimbal for stability. Photos are crisp and clear, at 48MP resolution. It’s also the first drone with 8K HyperLapse capabilities. Although the footage isn’t as great in low-light, most of us are flying in daylight hours anyway.

Unofficially, on my kitchen scale, this unit weighs in at about 1.5 pounds, without prop guards, compared to 4 to 5 ounces for the other two, making this a much more stable unit. The HS 100 has GPS capability added. This feature eliminates the issue of the drone drifting away in windy conditions and allows the drone to hold steady with regard to altitude and distance from the controller. This allows the pilot to concentrate more on taking photographs than on trying to control drone flight.
The Phantom 4 Pro V2.0 features a professional-grade 1-inch CMOS sensor that can record in 4K video resolution and 20 megapixel still photos. Its mechanical shutter makes this model a rarity and highly sought after for aerial inspections and mapping. Advanced omnidirectional obstacle sensing makes it even easier to capture that picture-perfect shot, without compromising the safety of the operation.
The Phantom 3 Pro shoots video at 4K, 3820 x 2160 pixels on a fully stabilized, 3-axis gimbal. You can shoot 4K videos of up to 30 fps and take 12 MP photos. Besides, it has a vision positioning system enabling a stable flight experience indoors as well, whereby you can fly it low to the ground in GPS free areas. Live viewing at 720 pixels is possible with Lightbridge digital streaming, along with full-resolution videos getting recorded in the microSD card. It also comes along with a flight battery and remote control that is rechargeable.
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