Exposure compensation is the introduction of manual corrections to the camera's exposure settings.
What is exposure compensation
The value of the shooting exposure in foreign-made cameras is marked as EV (Exposure Value), and can be adjusted in steps of 1/3, 2/3 or 1 stop both in the positive and in the negative direction. With a change in the value of the shooting exposure, the exposure setting changes by 1/3, 2/3 or 1 stop, respectively. Such adjustments are necessary if you are shooting objects in “non-standard” conditions for electronics.
The exposure can be corrected manually by shifting the exposure parameters - aperture, speed shutter... In digital cameras, also by changing the light sensitivity of the matrix. To introduce exposure compensation for parameters, in addition to manual editing directly in the camera, light filters and special tools can be used, such as fixing the exposure on a card with 18% gray (the electronics itself will correct everything according to the sample). During post processing, for example, you can also make a correction - for this you need to take a test shot of the object next to the same card.
As an example - in order to make snow white, you need to increase the exposure value by one stop (since snow has aоmore reflective), etc.
Photography with exposure compensation +1 2/3 EV. Without correcting, details were not visible at the bottom of the image.
The exposure compensation button can be located both on the camera body, and be software-bound to the settings control dial, or be bound to a key combination. On the camera body, the button looks like this
and is denoted as "+ -".
Flash Exposure Compensation
The ability to adjust the exposure of the flash up or down relative to the level obtained using the automatic.
It can be used in the case when the automation is not able to accurately set the correct exposure, as well as to obtain artistic effects.
Applying Exposure Compensation
- If you shoot in aperture priority mode (A, Av, Aperture Priority) - pressing the button and then changing the parameters on the light scale to the left / right changes the speed shutter camera and sensor sensitivity when Auto is selected ISO.
- If you shoot in priority mode shutter (S, Tv, Shutter Priority) - to compensate for the exposure, the aperture value and the sensor's sensitivity will change (if the Auto ISO).
- If you shoot in manual mode (M, Manual Exposure), you will have to change the settings manually to compensate for the exposure. The camera's exposure meter will indicate the EV value based on lighting conditions.
- In semi-program mode (P, Program Mode), you can set separately the parameters of exposure and exposure compensation. When introducing exposure compensation excerpt и diaphragm will change at the same time.
The specific implementation of the exposure compensation control mechanism practically does not differ from the model and manufacturer of the camera, but just in case, I would advise you to look into the manual of your camera. Exposure compensation is usually unavailable in the “green” zone of the command dial and in scene modes.
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