P – Program Mode
A – Aperture Priority Mode
S – Shutter Priority Mode
M – Manual Mode
Programme mode –
In programme mode the camera automatically chooses the aperture and the shutter speed for the user. This mode can be used when one wants to quickly snap a picture. The mode is not usually considered as it does not give much control over the exposure.
Aperture Priority Mode –
In Aperture Priority mode the camera allows the user to manually set the lens aperture, while the camera automatically picks the right shutter speed for the image. The user has full control over subject isolation and the depth of field, because you can increase or decrease the lens aperture.
Shutter Priority Mode –
In Shutter Priority mode the camera allows the user to manually set the shutter speed, while the camera automatically picks the right aperture, based on the amount of light that passes through the lens.
This mode is used when motion needs to be frozen or intentionally blurred. If there is too much light, the camera will increase the lens aperture to a higher number, which decreases the amount of light that passes through the lens. If there is not enough light, the camera will decrease the aperture to the lowest number, so that more light passes through the lens.
Manual Mode –
Manual mode stands for a full manual control of Aperture and Shutter Speed. In this mode the user can manually set both the aperture and the shutter speed to any value they want – the camera lets the user to fully take over the exposure controls.This mode is generally used in situations, where the camera has a hard time figuring out thecorrect exposure in extreme lighting situations.
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