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Updated
The DJI Mavic Air is one of the cheapest drones that captures 4K video. The flight time of 20 minutes is around average for this budget. The Mavic Air is also quite portable and light, at only 0.95lbs of weight which makes it easy to carry around and transport it to and from the place you want to fly it.
SpecsUpdate
Pros
Pro Extremely portable
The Air has several features that make it easy to carry around. It folds into a very compact size ( 83 × 49 x 168 mm ) and can be conveniently carried inside an included case. During transportation, the gimbal is covered with a protective plastic part. The remote control is also small enough to be handy to carry in a backpack, without its sticks getting in the way, since they can be unscrewed and stored inside the remote.
Cons
Comments
Flagged Pros + Cons
Pro No image issues due to high stability
The Mavic Air's camera is attached to a 3-axis gimbal that ensures high stability when filming/photographing. This means that the pilot doesn't need to worry too much about being careful while maneuvering or ensuring a smooth flight route to attain good results.
Pro Very fast
This drone is capable of a maximum speed of 68.4 kph, which is faster than the Mavic Pro or Mavic Pro Platinum.