What does the aperture F 2 8 4mm 1 2179s iso 51 mean in G3, solve!!

I hope the upstairs is not so professional, so I don't talk nonsense. After all, you don't use your mobile phone to take pictures, do you look at your mobile phone to see the data of your mobile phone? For a camera, you will never understand just a few pieces of data, and hanging will always be hanging.

It's not that the wider the aperture, the better, to open up your shooting environment and lighting. Shooting must pay attention to the aperture, shutter, focal length, the landlord provided ** is obviously a focal length of 4mm, the aperture means one tenth of the maximum clear aperture, the shutter speed is 1 2179s, and the sensitivity is iso-51. A wide aperture can have a good background blur effect, and there will be a sense of layering, but it will lose sharpness and clarity.

Generally used in portrait shooting, 4mm is the actual focal length, because the image sensor is relatively small, so the scale factor will also be large, and the focal length of the equivalent 135 film is unknown. So you can't see the specific perspective. In fact, the most important thing for mobile phone photography is the image sensor, not the aperture and lens, because that thing is relatively small and has no comparison with the SLR.

Aperture F, focal length 4mm, shutter speed 1 2179s, sensitivity ISO-51. The difference with the meter is the aperture, and the difference with the lens View the original post

The smaller the aperture value of the Xiaomi Mi 2nd generation, the better. The larger the value of the 28mm super wide angle, the better View the original post

Aperture: The amount of light transmitted by the lens has the control effect of the aperture, usually the larger the aperture of the lens (the smaller the f-number), the more light will pass, the characteristic of the large aperture is that it can obtain a very shallow depth of field, that is, the effect that the subject is clear, the front and rear scenes are blurred, this means is often used in portrait photography, can highlight the subject. Of course, the focus under the wide aperture must be accurate, otherwise the shallow depth of field can easily cause the focus to deviate.

The smaller the aperture (the larger the f-number), the less light passes through, and a longer depth of field can be obtained under the small aperture, which is more suitable for expressing a wide range of scenery or environments, and the clarity range is large.

Depth of field: It is to adjust the focus to make the image clear, and the area within a certain distance before and after the focus can be clearly displayed, and this range is called depth of field, the longer the depth of field, the larger the range that can be clearly presented; Conversely, the lower the depth of field, the foreground or background will become blurred, and blurring is a hazy phenomenon caused by loose focus. From the perspective of optical theory, under the focal length of the lens, the only thing that can be clearly imaged is the plane at the distance of an object, and the scene outside this plane will be blurred.

ISO: This setting is available in both conventional and digital cameras, and it's the size of the film or CCD light sensitivity. The ISO value of ordinary household film is generally 100, which is like a standard value, under this value, we can basically achieve the correct in various occasions, and it is recommended that beginners can use this value to operate.

If it is lower than 100, such as 50 or lower, then the image quality will be improved, the picture will be more detailed, and it is suitable for shooting scenes such as portraits or landscape still lifes, and the layers are very rich. The image caused by low sensitivity is illuminated for a longer time, and it has to be supplemented by enlarging the aperture or slowing down the shutter speed** to achieve the correct picture requirements. If the sensitivity value is higher than 100, such as 200, 400 or higher, then the graininess of the film image will increase, and the CCD image will have noise, and it has the advantage of choosing a faster shutter speed or a smaller aperture, so that the amount of light entering can be reduced to achieve the correct **.

This method is more suitable for capturing sports scenes or dynamic scenes, and reasonable use can produce special effects. In darker environments, it is also a good idea to increase the sensitivity value.

It's to describe the aperture. is a coefficient that represents the aperture.

f 16 f 11 f 8 f That's what describes the size of the aperture. The higher the number, the smaller the aperture.

Here are some terms, let's get to know them.

[Photography Basics]4 minutes to give you a comprehensive understanding of the three elements, shutter speed, aperture, and the relationship between ISO The three elements of photography refer to**, focus and composition, today we will talk about it**,**It also contains three elements, namely shutter speed, aperture and ISO

The shutter speed is suitable for expressing the movement of the picture, which is simply to shoot moving objects. High-speed shutter to capture the instantaneous action posture of the sports subject, such as water splash, sports competition, etc. Slow shutter, record the trajectory of light points to express the dynamics of the picture, such as star tracks, car tracks, light paintings, etc.

The higher the sensitivity, the more the picture**, but it will cause noise to affect the image quality. The higher the ISO, the more noise increases, and the image quality suffers. The lower the ISO, the less noticeable the noise, and the best image quality.

Shutter speed, aperture, and iso** amount are correlated. The combination of aperture and shutter speed is called the ** value. Together with the sensitivity, they determine the brightness of the **. In short, the brightness of the amount of sensitivity.

The brightness of the light is proportional to the amount and sensitivity: when the sensitivity is unchanged, the larger the amount, the brighter it is; When the amount is constant, the higher the sensitivity, the brighter it is.

When constant, the combination of aperture and shutter speed is not unique. Different combinations can achieve the same ** effect, but the ** effect of shooting is different.

If the shutter speed is 30, the aperture is maximum, and the indicator light flashes, it is insufficient; If the shutter speed is 8000 and the aperture is minimal, it is excessive. The brightness of ** is basically determined by the total amount of light received by the image sensor, and the aperture and shutter act as a regulating valve to adjust the amount of light.

In order to get the right brightness, it is necessary to adjust the linkage between the two. A certain amount of brightness can be achieved with a high-speed shutter and a large aperture, and the same brightness can be obtained with a low-speed shutter and a small aperture.

Usually aperture and shutter speed constitute the required ** combination ISO is generally only used when you need to use a faster shutter speed.

ISO is the nominal unit of photosensitivity of an image sensor.

The aperture and shutter are used to control the total amount of ** when shooting. The amount of ** required decreases as the ISO increases, and decreases as the brightness of the subject increases.

The ISO value is X2 (doubled), the sensitivity of the sensor is doubled, and the amount of ** required is reduced to 1 2

The aperture value is x2, and the amount of ** is reduced to the original 1 4 (the reciprocal relationship of squares). So the aperture is 2 times different from the root number.

The shutter speed is x2, and the amount of ** is reduced to 1 2.

For example, if ISO 200, aperture 4, and shutter 1 30 are used in a scene** is normal. Then, the following combinations are also normal.

ISO 200, aperture 8, shutter 1 8

ISO does not change, **sensitivity does not change. The aperture is two stops smaller, and the shutter speed is also reduced by two stops).

ISO 200, aperture, shutter 1 15

ISO does not change, **sensitivity does not change. The aperture is one stop smaller, and the shutter is also one stop down).

ISO 200, aperture, shutter 1 60

ISO does not change, **sensitivity does not change. The aperture is one stop larger, and the shutter should also be increased by one stop).

ISO 200, aperture, shutter 1 125

ISO does not change, **sensitivity does not change. The aperture is two stops larger, and the shutter should be increased by two stops).

The following principle is similar, you can analyze it yourself.

ISO 100, aperture, shutter 1 8

ISO 100, aperture 4, shutter 1 15

ISO 100, aperture 2, shutter 1 60

ISO 100, aperture, shutter 1 125

ISO 400, aperture 11, shutter 1 8

ISO 400, aperture 8, shutter 1 15

ISO 400, aperture 4, shutter 1 60

ISO 400, aperture, shutter 1 125

The aperture is mainly used to control the depth of field, if the background blur is required, use a large aperture, if the landscape requires a small aperture, the larger the number after f means the smaller the aperture, and the smaller the number behind f means the larger the aperture.

The shutter is about the first time, for example, to shoot moving objects at high speed (i.e., short time).

The sensitivity is the sensitivity of the film to light, simply put: the higher the ISO (for example, 800) in the case of the same aperture, the shorter the ** time, and vice versa. For example, you can use ISO100 in sunlight, ISO200 in shade, and ISO400 or 800 for shooting on stage.

I don't know how much you know about aperture, shutter, and sensitivity, but if you are not sure about these concepts, I suggest you take a look at the introduction of these concepts

Aperture: f refers to the size of the light inlet of the lens that is larger than smaller.

Shutter: 1 25 refers to 1 25 per second.

Sensitivity ISO: 160 The brighter the sensitivity.

It is recommended that the landlord look at a 6 basic concepts called Introduction to Photography. You can see it at a glance, a few minutes.

These are the basic knowledge of photography, and the first floor is just that.

It seems that the landlord's supplementary photography knowledge.

Aperture: is the parameter that controls the entry of light into the camera.

The larger the aperture coefficient, the smaller the aperture enters.

On the contrary, the shutter: It is also a parameter that controls the entry of light into the camera, which is generally used with the aperture, and is divided into a gate, a gate

Using the shutter to create a dynamic effect.

Sensitivity: The sensitivity of the film to light.

Aperture is a device used on the lens to control the amount of light entering the camera, ISO refers to the sensitivity of the film, the higher the sensitivity, the darker the day can also leave a perfect image on the film, the shutter speed refers to the time it takes for you to click all the way from click to click when you press the shutter...The faster the click, the faster your shutter speed....You will be able to photograph that moment, and if you photograph the creek, you will be able to photograph the splashing droplets very clearly...Slow shutter speed....The movement of what you shoot stays on the film....For example, if you shoot a stream, the water you shoot will be like a white satin from top to bottom...In addition, the shutter speed and aperture are adjusted accordingly....The shutter speed is fast....The aperture is about to open wide...In this way, there is enough light flow on the negative, and the image that comes out is normal....Children, what the big brother said is not popular enough...The eldest brother has passed the national senior photographer exam....

Aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface in the body, which is usually in the lens. What we usually call the aperture value is the aperture "coefficient", which is relative to the aperture, not the physical aperture of the aperture, and is related to the physical aperture of the aperture and the distance from the lens to the photosensitive device (film, CCD or CMOS).

To express the aperture size, we use the f-number. Aperture f-number = focal length of the lens The diameter of the lens aperture From the above formula, it can be seen that to achieve the same aperture f-number, the aperture of a long focal length lens is larger than that of a short focal length lens.

When the physical aperture of the aperture is unchanged, the f-number will be smaller the f-number will be the f-number as the distance between the lens center and the photoreceptor is the same, and the f-number will be larger the f-number will be the closer the distance between the lens center and the photoreceptor. The complete aperture values are as follows: f1, f2, f4, f8, f11, f16, f22, f32, f44, f64.

It is worth mentioning here that the smaller the aperture f-value, the more light will enter in the same unit time, and the amount of light entering the upper stage is just twice that of the next stage, for example, the aperture is adjusted from f8 to, the amount of light entering is doubled, and we also say that the aperture is opened one step wider. Most non-professional digital camera lenses have a short focal length and a small physical aperture, and the physical aperture of the F8 time circle is already very small, and if it continues to shrink, optical phenomena such as diffraction will occur, which will affect imaging. Therefore, the minimum aperture of non-professional digital cameras is generally from f8 to f11, while professional digital cameras have a large area of sensors, and the lens is far away from the sensors, and the aperture value can be very small.

For consumer digital cameras, the f-number of the aperture is often between -f16. In addition, many digital cameras can make 1 or 3 levels of adjustment when adjusting the aperture.

[Photography Basics]4 minutes to give you a comprehensive understanding of the three elements, shutter speed, aperture, and the relationship between ISO The three elements of photography refer to**, focus and composition, today we will talk about it**,**It also contains three elements, namely shutter speed, aperture and ISO

The shutter is opened, and the light shines on the CCD CMOS through the lens, so that the shooting is too dark and insufficient, and too bright is excessive.

The aperture is a mechanism in the lens that controls the amount of light transmitted.

ISO is the sensitivity, the higher the light, the more sensitive to light, the brighter the shot, but the more noise, the smaller the aperture index, the slower the shutter speed, the higher the ISO, and the more ** in the end, the brighter it is.