Such outbreaks have a full duplex interface with the camera.
Among the basic functions – TTL-management, “avtozumirovanie” emitter, AF illuminator, information about the camera ready, to combine several outbreaks in the wireless system and so
System flash – this is very complex and often expensive devices, consideration of which is beyond the scope of this article.
However, it is quite possible that soon the situation with external flash units for low-cost compact cameras will vary.
For example, Canon’s recently introduced a new “soap-box” entry level (A520), which implies “of seat” to the left of the hull of the simplest external flash.
One of the main parameters of the flash is the guide number – a quantity equal to the product of the diaphragm of the distance (in meters) from the emitter flash to the subject.
This number characterizes the conditions of exposure when shooting with flash.
However, in practice, when reading the characteristics of amateur cameras, you rarely come across this term.
Most vendors reflect the technical characteristics of their effective range of flash devices in determining the sensitivity matrix.
This figure depends mainly on the power of the emitter and the size of the reflector.
So naturally, that super-compact cameras effective range is lower than the bulkier relatives.
In addition to combat “red-eye reduction, built-in flash cameras are sometimes provided, and some other functions.
One of the most interesting – the so-called “second curtain sync” (or slow synchronization).
This mode is designed for better images of moving objects in the dark, and the principle of its work the easiest way to illustrate the example.
Suppose we remove a vehicle that moves along a dark street on the left to right with headlights and marker lights.
In order to better explore the dark background, apply a long exposure (eg, 1,5 c), authorize the use of the outbreak and, as soon as the machine appears in the frame, press the shutter release button.
What happened?
The outbreak triggered the moment the shutter is opened (the first curtain “) and its short pulse (milliseconds) brightly lit our car, but after that continued exposure, and because the machine has also continued to move in the right side of the frame hit” plume “from her included lighting.
Thus, we got to the track with a well-lit car in the left side of the frame and its “light footprint” – in the right.
When viewing a snapshot impression that the car was moving backwards, which looks unnatural, and does not correspond to reality.
Therefore, to capture these scenes convenient synchronization “second curtain” when the flash is triggered not when you open the gate, and just before its closure (ie
not at the beginning and at the end of exposure).
In our example, slow sync leads to the fact that the “tail” remains in the left side of the frame, and an elaborate machine is on the right.
This picture looks more authentic, so if you plan to shoot a lot in the dark with a flash sync feature on the “second curtain” would be superfluous.
Another useful feature that is sometimes found in the “advanced” vehicles, a power regulation built-in flash.
For example, when shooting close-lying object, you can install only the power (to avoid flare), as when shooting from afar – on the contrary, make the flash work “full”.
Additional
High-speed photography.
Speed Sensing – a regime in which the camera takes pictures not alone, as usual, and the series – in the hope that at least one frame in the series were good.
In this setting focus, exposure and white balance for the entire series are produced, usually on the first frame.
Serial mode is indispensable during the shooting (eg, sports sorevnovny), shooting children, pets, etc.
, So most cameras have it in their arsenal.
However, the value of high-speed photography depends strongly on the actual maximum speed at which the device can shoot a series of photographs.