Range of flight
The distance that a quadcopter can travel in the air on one full battery charge. Simply put, this is the drone's range in kilometers. Note that smaller, lighter drones tend to have a more limited flight range compared to larger, more powerful models. In the latter, it can reach 30 km or more. Also, the maximum flight distance is often influenced by weather factors and the load carried by the copter.
Maximum flight time
Maximum flight time of a quadcopter on one full battery charge. This indicator is quite approximate, since it is most often indicated for ideal conditions - in real use, the flight time may be less than stated. However, by this indicator it is quite possible to evaluate the general capabilities of the copter and compare it with other models - a longer declared flight time in practice usually means higher autonomy.
Note that for modern copters, a flight time
of 20 minutes or more is considered a good indicator, and in the most “long-lasting” models it can exceed 40 minutes.
Horizontal speed
The highest speed that a quadcopter can achieve in horizontal flight. It is worth considering that in most cases this parameter is indicated for optimal operating conditions: a fully charged battery, low air temperature, minimum weight, etc. However, it is quite possible to rely on it both when choosing and when comparing different models of copters with each other.
Note that quadcopters were originally designed as stable and maneuverable aerial platforms, and not as high-speed vehicles. Therefore, you should specifically look for
a fast quadcopter only in cases where the ability to quickly move from place to place is critical (for example, when the device is supposed to be used for video recording of fast-moving objects over large areas).
Ascent / descent speed
The speed at which the quadcopter rises up in the air or descends to the ground. Recreational, photo and video models tend to have more moderate climb/descent speeds, while professional or racing drones can rise and fall much faster. This indicator can be used to evaluate how quickly the copter can rise to a height for filming or, if necessary, avoid obstacles, and a high descent rate will be useful if the drone needs to be returned to the ground quickly and safely.
Wind impedance
The ability of a quadcopter to maintain and maintain stable flight parameters in windy weather. In this column, it is customary to indicate the wind force in meters per second, which ensures trouble-free takeoff and landing of the drone within the permissible wind speed. Directly in flight, copters can overcome the resistance of even faster winds. But takeoffs and landings with wind strength above the designated level are fraught with unpredictable movements of the drone, loss of control and an increased risk of emergency situations.
Full HD filming (1080p)
The maximum resolution and frame rate supported by the aircraft camera when shooting in
Full HD (1080p).
The traditional resolution of such a video is 1920x1080; this is what is most often used in drones, although occasionally there are more specific options — for example, 1280x1080. In general, this is far from the most advanced, but more than a decent high-definition video standard, such an image gives sufficient detail for most cases and looks good even on a large TV screen — 32 "and more. At the same time, achieve a high frame rate in Full HD It is relatively simple and takes up less space than higher resolution content, so Full HD shooting can be done even on aircraft that support more advanced video formats like 4K.
As for the actual frame rate, the higher it is, the smoother the video turns out, the less motion is blurred in the frame. On the other hand, the shooting speed directly affects the requirements for the power of the hardware and the volume of the finished files. In general, values up to 24 fps can be called minimal, from 24 to 30 fps — medium, from 30 to 60 fps — high, and speeds over 60 fps are used mainly for
slow motion Full HD.
Quad HD filming
The maximum resolution and frame rate supported by the aircraft camera (built-in or bundled) when shooting in
Quad HD.
This standard is intermediate between Full HD (see above) and UltraHD 4K (see below); in cameras of modern drones, the Quad HD frame size can be from 2560 to 2720 pixels horizontally and from 1440 to 1530 pixels vertically. In some situations, such a video turns out to be the best option: it gives better detail than Full HD, while it does not require such powerful “hardware” and capacious drives as 4K.
As for the actual frame rate, the higher it is, the smoother the video turns out, the less motion is blurred in the frame. On the other hand, the shooting speed directly affects the requirements for the power of the hardware and the volume of the finished files. In general, values up to 24 fps can be called minimal, from 24 to 30 fps — medium, from 30 to 60 fps — high. Speeds of more than 60 fps are mainly used for shooting slow-motion video, however, for a number of reasons, such a possibility is rarely provided for in the QuadHD standard: relatively simple devices would require too powerful and expensive hardware for this, and in advanced copters, where the cost of electronics not particularly important, manufacturers prefer to use slow motion at higher resolutions.
Viewing angles
The viewing angle provided by the standard quadcopter camera; for optics with adjustable zoom, usually, the maximum value is taken into account.
The viewing angle is the angle between the lines connecting the centre of the lens to the two opposite extreme points of the visible image. Usually measured along the diagonal of the frame, but there may be exceptions. As for the specific values of this parameter, in modern copters they can range from 55 – 60 ° to 180 ° and even more. At the same time, a wider angle (ceteris paribus) allows you to simultaneously fit more space into the frame; and a narrower one covers a smaller space, however, the objects that are in the frame look larger, it is easier to see individual small details on them. So when choosing by this parameter, you should consider what is more important for you: wide coverage or an additional zoom effect.
Time lapse
In
Time-Lapse mode, shooting is carried out at a very low frame rate (one frame every few seconds, or even minutes), due to which the effect of fast movement is achieved in the finished video (for example, a day from sunrise to sunset can fit in several minutes). This can be very convenient for fixing long-term events in which it is necessary to capture not so much the details as the general trend. For example, with the help of Time Lapse, you can shoot how the square before the concert was filled with people, or how the lighting of the landscape changed at sunrise / sunset, “stinging” these processes from a couple of hours to several minutes.
Note that the specific features of the implementation of Time Lapse in copters can be different, this point should be clarified separately.