What are the functions of the M A S P mode on a SLR camera?

P mode is program automatic exposure mode.

P mode is similar to fully automatic mode when no adjustments are made to the camera. When taking photos using this mode, the camera will automatically adjust the aperture and shutter according to the lighting conditions on site to obtain a reasonable exposure. P mode is mostly used by beginners or when taking snapshots.

2. A mode is aperture priority mode.

In this mode, you can freely change the aperture size without adjusting the shutter speed. The shutter speed automatically adjusts as the aperture changes to ensure reasonable exposure.

Aperture is the main condition that determines the blur and clarity of the scene in the picture. It even determines the exposure to a certain extent, that is, the light and dark effects of the picture. Therefore, the camera's aperture priority mode is the most important shooting mode. Photographers with a certain foundation often use aperture priority mode to shoot, and it is widely used when shooting portraits, landscapes, flowers, macro and other photos.

3. S mode is shutter priority mode.

In this mode, the photographer can freely adjust the shutter time. At this time, the aperture will change with the change of the shutter, thus ensuring reasonable Exposure. You can use shutter priority mode to shoot some creative effects. For example, when shooting waterfalls, using a slow shutter speed can make the water flow like silk threads.

When shooting some sports scenes using a high-speed shutter, you can also condense the instantaneous movements of the subject without making the photo look blurry.

4. M mode is a manual mode. In this mode, both aperture and shutter need to be adjusted manually, making shooting more difficult.

Reference materials

Script House. Script House [Citation time 2017-12-28]