Why do skilled photographers generally like to use A or AV mode?

Nikon's A file and Canon's av file are aperture priority files.

The advantage of using aperture priority file is that it is convenient to adjust aperture size and reduce the adjustment time of other parameters. For example, under aperture priority, the shutter speed is matched by the camera according to the exposure and aperture value you set. Therefore, using the aperture priority file can adjust the parameters and shoot faster.

Aperture not only determines exposure, but also has a great influence on depth of field. The depth of the large aperture is used to highlight the main body; Small aperture and large depth of field are used to shoot scenery.

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In addition, the so-called M-speed full manual gear, if only the built-in metering system of the camera is used as a reference for exposure prediction, is actually no different from the semi-automatic gear with aperture priority, except that the parameters automatically set by the camera are changed to manual adjustment.

If you want to get better results, you should use the M manual gear with an external exposure instrument, but because of the budget and carrying reasons, non-professional photographers rarely use it.

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Because the depth of field can reflect your creativity when shooting, it is a very important consideration. Based on this, the aperture priority file is a very important semi-automatic file.