1. Back of the camera focus button (AF-ON)
The AF-ON button is usually located on the back of the camera in a convenient thumb position.
Focusing is also usually done by pressing the shutter halfway, but there is another way to achieve autofocus: by pressing the AF-ON button on the back of the camera. The following are two `examples' that I use frequently.
(1) Pressing AF-ON to pre-focus (trap focus) while waiting for some subject to enter the shooting range, and then pressing the shutter all the way once the subject is in;
(2) Press and hold the AF-ON button in AF-C mode to focus, and then press the shutter to shoot as soon as the composition is right;
When to use the AF-ON button depends on your needs and preferences, but its function is mainly to allow you to quickly press the shutter and shoot without having to go through the step of half-pressing the shutter to focus.
You can also use the AF-ON technique for shooting moving animals by setting the AF to AF-C (continuous AF) and then locking it with AF-ON to keep shooting.
2. Use different exposure modes for different situations
Novice photographers often use full auto, P, etc. These modes are not used by professional photographers, but rather aperture priority, shutter priority or full manual mode to give the photographer more control to get the desired shot. This list gives examples of situations where these modes are recommended (by situation, not necessarily always).
Ever noticed that one of these modes is used at all times? Yes, M-mode is the full manual mode, but in fact, a good use of aperture priority and shutter priority plus exposure compensation can be used in most situations.
Beginners should take advantage of the convenience of aperture priority and shutter priority, and with good composition, you can easily take good photos.
3. Use the "spot metering" function
Spot metering can be used to assist when shooting situations where there is a large difference in light, or where the subject must be accurately exposed.
Among the different exposure functions, balanced metering is the easiest to use, but one of the extreme, but sometimes very useful, metering modes is spot metering, which has a small metering range.
In spot metering mode, the camera will only meter at the focus point (some cameras will only meter at the middle focus point), which is a very small range. Light sources outside this range are not counted in the metering value, so it is ideal for use in situations where there is a wide range of light differences, such as concerts, backlit portraits, etc. Of course, if you are experienced, it is possible to use full-zone balanced metering and adjust it with exposure compensation, but spot metering is more straightforward.