Why do digital cameras take pictures slowly and it takes a long time to take pictures by pressing the shutter?

Digital cameras respond slowly when taking pictures, generally because the shutter speed is slow. There are several solutions:

1, the most direct way is to set the camera to full automatic mode (fool), and the camera will guarantee the shutter speed;

2. Manually set the shutter speed and use a large aperture to ensure normal exposure;

3. Shutter priority mode, which allows the camera to automatically adjust the aperture suitable for setting the shutter;

4. When the light is insufficient, the shutter speed will slow down and you can turn on the flash;

5. When the light is insufficient, you can choose to increase the ISO sensitivity appropriately.

10 optimal focusing technology

One of the first rules of photography is to have a clear theme. Most modern digital cameras provide many ways to get clear photos. In this article, we will look at the most important digital camera focusing technology and the best settings to use. We will look at how to choose the autofocus point and which focusing mode to use.

Prompt 1. Manual focus

Although almost all modern digital cameras can focus the lens automatically (except Leica M9, Leica M9-P and Leica Monochrom), they can also let you focus manually.

Manual focusing is a particularly good choice for macro shooting, because it is difficult for many cameras to lock very close objects, and every time the shutter button is pressed, the lens will end its search (move in and out of focus).

It is not frustrating to switch the camera (or lens) to manual focus and finish the work by yourself.

More importantly, live view technology makes manual focusing very easy, because you can usually enlarge the image on the big screen to see the exact point you are interested in, and then adjust the focus until it is completely clear.

Tip 2. Single autofocus

Usually abbreviated as single autofocus or single autofocus, this camera focusing option can set the camera to focus when the shutter release button is half pressed, and aim the lens at the selected subject until shooting is completed and the button is released.

If you need to refocus, you must take your finger off the shutter button and press it again.

Monofocal mode is very useful for static themes, such as still life and scenery.

Tip 3. Continuous autofocus

When this camera focusing option is selected, the camera will continue to focus as long as the shutter button is half pressed or the AF button is pressed.

This is a very good choice when shooting moving objects, because the camera will constantly adjust the focal length as the object moves in the picture.

Advanced cameras, such as Canon EOS 7D Mark II and Nikon D500, have options that allow you to specify which autofocus points the camera will use to track objects.

Some even allow you to specify the response speed of the camera to the change of object distance, so as to prevent the camera from focusing when the stadium column temporarily blocks the line of sight.

When using continuous autofocus, it is usually best to manually set the start autofocus point so that the camera knows what the target is before starting tracking.

If you like shooting sports or moving fast, make sure to check the continuous autofocus option of the camera.

Tip 4. Automatic focus selection

When you autofocus, you need to put an effective autofocus point on the main body of the viewfinder to make it clear.

Generally speaking, there are two ways to choose the autofocus point by using this camera focusing technology.

The easiest way is to let your camera decide for you and use the autofocus selection point option.

In many cases, the camera will do well, which is a useful choice when you don't have much time to shoot.

However, your camera usually tries to focus on the nearest object near the center of the picture, and usually does not point out the smaller objects or details well. To this end, it is best to set your own autofocus point, just like the one we shot above.

Tip 5. Manual autofocus point selection

Setting your own autofocus point allows you to control the focus position of the camera to the greatest extent. When you have time to operate the necessary camera control, it is a good choice for landscape, still life and portrait shooting.

Setting the camera focus option is usually done by pressing the autofocus point selection button, and then using the navigation control button to select the desired autofocus point, while watching through the viewfinder. If you have a touch screen, you can simply click on the area you want to pay attention to.

Once you reach the autofocus point of the theme, you are ready to take a focused photo.

In some cases, you can set the navigation control to directly select the autofocus point without pressing the button in advance, but this may sacrifice the usual shortcut function.

Tip 6. Face detection autofocus

This popular camera focusing option is a way to automatically select the autofocus point, which can be found in the most compact and compact system cameras, even some digital SLR cameras in live view mode (when images are synthesized on the screen).

Its working principle is to recognize faces in the scene and then pay attention to their priorities.

Improvements to the camera's focusing system include smiling face shutter, which will trigger the shutter to start when the camera detects that the subject is smiling (it doesn't apply to every smile, but it may be very effective), while more advanced systems can focus on specific eyes that are really in precise focus.

Some cameras can also be set to recognize and focus on specific faces in the crowd. This is a very useful choice. You can take pictures of your children when they are surrounded by other children at parties or activities.

When face detection autofocus is activated, you will notice that the box around people's faces on the camera LCD screen shows that they have been recognized. Press the shutter half way to focus on the face to shoot.

As you can imagine, face detection autofocus is very useful in parties and social gatherings when you want to get photos of many people.

Tip 7. Key points and recombination technology

Although most digital cameras provide a series of autofocus points so that you can choose the autofocus point located on the main body, it may not always be the only position you need.

In these cases, the camera's "focusing and regrouping" technology is very convenient-even for the subject, it can be faster than selecting the autofocus point.

For example, imagine that the central autofocus point is selected, but the subject deviates from one side of the screen. You just need to move the camera so that the autofocus point is above the subject and press the shutter button halfway to focus the lens.

Now, half press the shutter button to keep the focus locked, re-compose the picture, so that the subject is in the required position in the picture, and then press the shutter release button to shoot.

This is also a useful focusing technique used in low light conditions, because the external autofocus point is often more sensitive to focusing than the center.

When using this camera focusing technology, the camera must be set to single autofocus mode. If it is set to continuous autofocus, when you re-compose, the camera will refocus the lens on anything below the effective autofocus point.

Tip 8. Back button focus.

Usually, the way to focus the lens is to press the shutter half-way, but many cameras also have an autofocus button to press, so there is no risk of half-pressing, and some photos are taken accidentally.

If the exposure setting is not locked until you want to take an image and press the shutter release button, this function is particularly useful when shooting a moving object using this back button focusing technology.

This focusing technology allows you to see the subject clearly in the picture, and only shoot when the composition or lighting is just right.

This also means that if something moves into the picture, another player can stop focusing by turning off his thumb from the AF button while shooting sports, but continue to take pictures.

The back button is also useful when shooting objects such as plants and flowers that move slightly in the breeze.

If the shutter button does not control autofocus, the camera will not waste time trying to focus every time the shutter release button is pressed, and can wait for the subject to be in the correct position to shoot.

Tip 9. Hyperfocal distance focuses.

This is a popular camera focusing technology, which aims to get the maximum scene clarity at any given aperture.

The traditional use method is to focus on the theme, and then use the depth of field scale of the lens (or tape measure and Jing Shenbiao) to find the nearest acceptable cusp position.

At this time, the depth of field starts from the front of the focus, which is called hyperfocus.

Once the hyperfocus is found/calculated, the lens will be refocused to keep the subject clear and make better use of the depth of field.

Due to the popularity of zoom lenses and the consequent decrease in depth of field, it is difficult to accurately apply this technology, but you can still measure or estimate the focal length and tell you about hyperfocal distance by using smart phone applications such as DOF Master.

Alternatively, you can rely on the principle of depth of field, that is, the depth of field extends about twice behind the focus and focuses about one-third of the focus on the scene.

Hyperfocal distance long-distance focusing is very popular in landscape photography and any occasion that requires a lot of depth of field.

Tip 10. Key stack

Focus superposition is a digital technology, which combines multiple images taken with different focal lengths from foreground to background into a clear image.