How does the camera shoot the depth of field

Question 1: How does a SLR camera control the depth of field? The so-called depth of field means that the subject presents a clear range in the shooting scene. The depth of field can be long, short or shallow. We can adjust the photography mode as needed to control the depth of field. There are usually three reasons that affect the depth of field:

1. The larger the aperture, the shallower the depth of field, and the smaller the aperture, the longer the depth of field.

Under the condition that the shooting distance is constant, when shooting with a large aperture, the scenery before and after the subject will become blurred because the depth of field becomes shallow. When using a small aperture, the distance between the front and back of the subject will become longer.

2. The longer the focal length, the shallower the depth of field, the shorter the focal length and the longer the depth of field.

When the aperture and shutter are unchanged, shooting the same scene and using a telephoto lens will make the depth of field shallow. When using a wide-angle lens, the depth of field will be longer.

3. The closer to the subject, the shallower the depth of field, and the farther away from the subject, the longer the depth of field.

With the aperture, shutter and lens focal length unchanged, the closer you are to the subject, the shallower the depth of field will be. The farther away from the subject, the longer the depth of field.

Question 2: How does a SLR achieve a great degree of depth of field? The depth of field is the clear distance of the focus area. Not the degree of background blur.

The factors that affect the depth of field are aperture, lens focal length and shooting distance. Are all regular.

The smaller the aperture, the greater the depth of field, the smaller the lens focal length, the greater the depth of field, and the farther the shooting distance, the greater the depth of field.

So conversely, the larger the aperture, the farther the focal length of the lens, the closer the shooting distance and the more virtual the background.

For the head of 18- 135, just pull it to 135mm, use a large aperture, and shoot the whole body for about 5-10m, which will have blur effect.

But your lens is still limited, the imaging is average, the aperture is too small, the blur quality is poor, and you are still a little reluctant to take a full-body blur effect.

Question 3: How to adjust the depth of field of SLR! The depth of field of digital SLR need not be adjusted, because it can be observed directly. There are two factors that affect the depth of field: aperture and lens focal length.

Theoretically, the depth of field is a clear range. The larger the aperture, the smaller the depth of field (shallow bones, smaller the aperture and larger the depth of field). The longer the lens, the smaller the depth of field, the shorter the lens (small focal length) and the longer the depth of field.

When adjusting, try to use the maximum aperture and the longest lens on the existing lens to take photos with relatively small depth of field.

Question 4: How to shoot works with small depth of field, small depth of field and large aperture!

The depth of field depends on three factors: the focal length of the lens, the distance between the camera and the subject, and the aperture used. Depth of field and

The relationship between the above three factors is: the longer the focal length, the shorter the depth of field; The shorter the focal length, the longer the depth of field (for example, under the same light)

In the case of circle and distance, the scene depth of 28mm lens is greater than that of 70mm lens); (2) The closer the distance, the better the scene.

The shorter the depth, the farther the distance, and the longer the depth of field (for example, under the same focal length and aperture, when the subject 10 meter,

The scene depth is greater than the depth of the subject at 1 m); (3) The larger the aperture, the shorter the depth of field, and the smaller the aperture, the larger the scene.

The longer the depth of field (for example, under the same focal length and distance, the scene of F 16 aperture is far greater than the depth of field of F4 aperture.

Depth of field).

However, when shooting small depth of field, it is usually better to use large aperture than long focal length, because too long focal length often leads to image distortion.

Question 5: How do digital cameras take photos with shallow depth of field/deep depth of field? 1, adjust the aperture size

From the imaging principle, the scene with large aperture is deep, and the scene with small aperture is deep, that is, the depth of field of F2.0 is shallower than that of F8 with the same focal length. The CCD size of ordinary digital cameras is much smaller than that of film, that is, the large aperture of F 1.8 is used, and the depth of field is also very deep, so this rule is only applicable to traditional cameras and digital SLR cameras with CCD size close to film (relatively speaking).

Step 2 change the focal length

When you go to the lotus pond in fine weather, you will see some photographers busy there with long lenses. The lotus flowers are as clear as before and the background is very hazy. If the lotus is backlit, spot metering can be used to capture the feeling that the background is completely black and the mud is not stained. This is why a long focal length produces a shallow depth of field. However, the effect of obtaining shallow depth of field with long focal length is not as good as that with large aperture, because the range of background will become very small, and if the background is too far away, the stereoscopic impression will be greatly reduced. In addition, a long focal length will easily make the picture shake obviously, so it is recommended to use a shutter with a focal length of more than twice (for example, when shooting with a focal length of 200mm, the shutter should be about 1/350 or 1/500 to ensure a clear picture).

Nowadays, popular digital cameras generally have triple optical zoom, and the focal length is about11x mm (the conversion value of 35mm cameras). Taking some flowers and grass can get a good shallow depth of field effect, but for the bust, the focal length should be at least 200 mm.

3. Shooting distance and shooting background

Digital cameras should take pictures with obvious background blur, and the subject should be close to the lens, so that the effect of background blur is obvious. But after all, people are so big that they can't compete with flower worms. Only telephoto digital cameras can barely do it. Therefore, telephoto digital cameras are relatively large in size, but there are also many fans (of course, some of them are for shooting long-distance scenery and * * *). Therefore, the long focal length is suitable for taking portraits, and the short focal length is suitable for taking buildings, because taking buildings generally requires overall clarity and a wide shooting range.

In addition to the effect that the depth of field is shallow when the subject is close to the lens, the farther the subject is from the background, the more obvious the effect is. If you encounter a situation where the characters are far away from the background and the background is simple (such as Woods and lakes), don't hesitate to try two at once!

The above is the method of creating the depth of field in the back. Whether the foreground is deep or clear depends on the distance between the scene and the foreground. The farther the scene is from the foreground, the shallower the foreground, and vice versa.

Question 6: How does Canon digital camera take photos with small depth of field and large depth of field? You can choose portrait mode, landscape mode with small depth of field and landscape mode with large depth of field. Generally speaking, large aperture and small depth of field, small aperture and large depth of field.

Question 7: What is the depth of field? The explanation upstairs is very clear.

For example:

For example, if you take a picture of a kitten 3 meters away from you, then:

If you have a great depth of field, the scenery within 2 meters around the kitten can be clearly displayed, and the scenery beyond 2 meters away from the kitten is gradually blurred.

If your depth of field is very small, the scenery within 50 cm before and after may be very clear, and things beyond 50 cm will gradually blur.

Depth of field mainly depends on

1 Aperture used when shooting. The larger the aperture, the shallower the depth of field (which is the second case in the above example).

2 The focal length used, the longer the focal length, the shallower the depth of field.

The closer you are to the subject, the shallower the depth of field.

To sum up, if you are close to the kitten and shoot with a large aperture (for example, F 1.8) and a long focal length (for example, 200), then you may take this kitten as the center, and the scenery within the range of 10 cm before and after will be clear, while others will gradually blur.

If you are far away from the kitten and shoot with a small aperture (such as F 1 1) and a short focal length (such as 24), then you may take this kitten as the center, and the scenery within 5 meters before and after is relatively clear, and the others are gradually blurred.

Take a few more pictures and you'll feel it.

Question 8: How to get the depth of field for mobile phone photography depends on whether your mobile phone has the function of adjusting the aperture. Just raise the value (lower the aperture).

Question 9: Where is the aperture and depth of field of SLR adjusted? First of all, you should read more instructions. If shooting with AV files, just dial the wheel at the top right to adjust the aperture. If shooting in M range, directly dial the wheel to adjust the shutter speed, press and hold the key below * and then dial the wheel to adjust the aperture. No camera has the function of adjusting depth of field, only depth of field prediction. The larger the aperture, the longer the focal length and the smaller the depth of field. On the contrary, the bigger.