Household camera lens detailed parameters
The following are the detailed parameters of some home camera lenses: ** 1. Pieces and resolution ** 1. ** Pieces affect image quality **: Pieces are an important factor in determining the image quality of the camera. The higher the number of pixels, the higher the resolution. Theoretically, the better the image quality, but the cost and practical requirements must also be considered. The mainstream home camera's resolution was above 1080p (2 million resolution). Generally, 2 million resolution indoors could meet the demand, and 4 million resolution outdoors was more suitable. 2. ** resolution and network transmission **: The basic parameters of resolution are the number of pixels.For home cameras that transmit images through the network, the balance between image clarity and network speed is very important. It is not that the higher the resolution is, the better it is because the higher the resolution, the larger the storage space required and the higher the requirements for home network bandwith. The resolution of mainstream home cameras on the market is generally between 2 million and 4 million. This range can meet the daily needs of observing details such as faces and movements. ** 2. Perspective ** 1. ** Small room option **: If the room is small, you can choose a wide-angle 2.8mm card machine. 2. ** General situation **: Most household products support the rotation of the lens. When the camera is installed in the corner of the wall, you can see the front at a 90-degree angle. The indoor camera can be rotated horizontally (left and right) at about 340 - 360 degrees, and vertically (up and down) at 90 - 120 degrees. It can basically achieve 360-degree surveillance without blind spots. 3. ** Focus of the lens **: The focal length of the lens is the core parameters, which determines the range and distance of the monitoring angle. The home camera had a wide angle of view. The focal length range was usually between 2.8mm and 12mm. It could monitor the environment within a range of 3 - 20m. The zooming lens could adjust the focal length according to the distance of the observed object. ** 3. Radio band ** Pay attention to matching the frequency band of the home router. It supports 2.4G or 5G (not 5G/4G for mobile phone signals), and it is best to support dual-band. ** 4. Night Vision Function ** 1. ** infrared night vision **: Most home cameras support infrared night vision. They illuminate objects with infrared fill light and use the infrared light reflected by the object to form an image. When the light is dim, the image can be clearly formed, but the image has no color, and details such as faces are difficult to see clearly. 2. ** Full Color Night Vision **: Able to display a colorful image at night. The details are better than infrared night vision. However, the fill light may be switched on and off frequently when moving objects are detected at night (mosquitoes are easy to attract in summer). You need to choose according to your needs. ** 5. Storage Method ** 1. ** Local Storage **: Save the video in the built-in memory card of the camera. The advantage is that you don't have to pay. The disadvantage is that the storage capacity is limited. If the card is damaged, the video will be lost. If the camera is damaged, the video will also be lost. 2. ** Cloud Storage **: The video is stored in the cloud server of the product manufacturer. The recording is safe unless the platform fails, but it requires payment. ** 6. Intelligent Function ** 1. ** Movement Tracking **: automatically tracks moving objects and sends real-time alarm messages to mobile phones and other devices. 2. ** Alarm function **: When an abnormal situation is detected, an alarm sound will be immediately emitted and uploaded to the mobile app. 3. ** Voice intercom **: Similar to a walkie-talkie, it can achieve two-way voice communication. Read more exciting novels for free
Details of the camera lens parameters
The main parameters of the camera lens include focal length and aperture. The following is a detailed introduction: ** 1. Focus ** 1. ** Fixed focus lens ** - "definition: A lens with a fixed focal length. The common focal lengths are 10mm, 24mm, 35mm, 50mm, 85mm, 100mm, 135mm, etc. - Special traits: - The optical design and mechanical structure are simple, and the high image quality can be achieved at a low manufacturing cost. - It had a larger aperture and a lighter lens. - Because the focal length could not be changed, the adaptability was poor in scenes that required a quick change in the field of view. When shooting, one often had to move their position to change the framing range. 2. ** Zooming lens ** - "definition: A lens with a focal length that can be changed within a certain range, such as 12 - 24mm, 24 - 70mm, 70 - 200mm, etc. - Special traits: - The field of view could be changed, which was suitable for quick shots of active scenes. It was more convenient than carrying multiple fixed-focus lenses. - The structure was complicated, and the design of the optical path was difficult. Compared to the fixed-focus lens, the price was higher, the image quality was slightly worse, and the aperture was relatively small. - Different focal lengths: - Wide-angle range (usually <35mm): suitable for shooting culture, vlog, can highlight the sense of depth. - Medium focal length (usually 36mm-134mm): Often used for portraits or travel photography. - Telephoto end (usually> 136mm): suitable for shooting long-range shots, sports, flying birds, or expressing a sense of depth. ** 2. Aperture ** 1. ** Aperture expression and size relationship ** - The aperture value was marked with the letter f, such as 1:2.8, f/2.8, and F2.8. The smaller the f value, the larger the aperture, such as F1.4>F2.8>F4. The smaller the f value, the more blurred the background of the subject and the lighter the depth of field. At the same time, a large aperture also meant that the amount of light entering was larger. 2. ** Permanent Aperture and Non-Permanent Aperture (Floating Aperture)** - ** Permanent Aperture ** - For a zoom lens, the nominal maximum aperture can be used in all focal lengths, such as 24 - 70mmF2.8, 24 - 105mmF4, etc. - Special traits: - Generally, it can achieve better image quality (compared to a floating aperture lens). - Zooming when the aperture is set to the maximum will not affect the exposure. - If it was a wide-angle lens with a constant large aperture, it would be relatively expensive. - ** Non-constant Aperture (Floating Aperture)** - The aperture of the lens will change with the focal length, such as 18 - 300mmF3.5 - 5.6, 100 - 400mmF4.5 - 5.5, etc. - Special traits: - The lens was small in diameter, light in weight, and cheap. - The focusing speed was relatively slow. Due to the small aperture, it was not conducive to taking shallow depth of field photos. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Soviet camera lens parameters
The following are some of the parameters of the Soviet camera lens: - HELIOS44 58/2 lens ("Eight-feathered monster"). The specific parameters were not mentioned. - Mir - 1 2.8/37 lens: 37mm focal length (37.38mm), aperture ratio 1:2.8, field of view 60°, frame size 24x36mm, number of lenses/groups 6/5, front focal length-3.49mm, back focal length 37.17mm, distance from the first surface to the last surface 52.8mm, working distance (45.2mm for Mir - 1, 44.0mm for Mir - 1 -auto, 45.5mm for Mir - 1V), aperture ratio limit of 1:2.8 - 1:16, close-up focus limit of 0.7m, resolution of 45/23 lines/mm according to specifications (center/edge), light transmission rate of 0.78, connection (Lens-to-camera: Mir - 1 is M39×1, Mir - 1 -auto mount)(f/a Kiev - 10), Mir - 1V for M42×1; for screw attachment: Mir - 1 for Sp M49×0.5, Mir - 1V for M49×0.75; for snap-on attachment 51mm), overall size (The length of the lens with the lens cover: Mir - 1 is 62mm, Mir - 1V is 56mm, the largest frame diameter is 59mm), weight (Mir - 1 is 200g). - "JUPL- 9"("JUPL- 9" 2/85) lens: focal length 84.51MM, aperture 1:2 to 1:16, field of view 28 degrees 51 minutes, filter size M49*0.75MM, closest focusing 0.8M, seven pieces in three groups, the middle and back two parts are made of three lenses, the resolution is 32 lines/MM in the center, 23 lines/mm at the edge, volume 65(diameter)* 66mm, weight 0.36kg. - A particular camera had a focal length of 50mm and a clear aperture of 1:3.5. It was a three-piece, three-group orthoscope. The lens could be disassembled, and the shutter speed range was 1 - 1/1000. It also had a T-door and a B-door. There were ten levels of speed regulation, but the specific name of the lens was not mentioned. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The main parameters of the camera lens
The main parameters of the camera lens were as follows: ** 1. Focus related ** 1. ** Fixed focus lens ** - The focal length was fixed. The common focal lengths were 10mm, 24mm, 35mm, 50mm, 85mm, 100mm, 135mm, etc. - The optical design and mechanical structure of the fixed-focus lens were simple. It could achieve high image quality, large aperture, and lighter at a lower cost. However, because the focal length could not be changed, it was not suitable for scenes that required rapid changes in the field of view. For example, when shooting dynamic scenes, the photographer might need to move his position to adjust the viewing range. 2. ** Zooming lens ** - The focal length can be changed within a certain range, such as 12 - 24mm, 24 - 70mm, 70 - 200mm, etc. - The advantage was that the field of view could be changed, and there was no need to change the lens to take photos of different scenes. It was suitable for quick shots of active scenes. However, its structure was complicated and the design of the optical path was difficult. Compared to a fixed-focus lens, the price might be higher, the image quality might be slightly worse, and the aperture might be smaller. ** 2. Aperture related ** 1. ** Constant-aperture lens ** - For the zoom lens, the nominal maximum aperture can be used in all focal lengths, such as 24 - 70mmF2.8, 24 - 105mmF4, 50mmF1.2, 85mmF1.4, etc. - The constant aperture lens would not affect the exposure when zooming at the maximum aperture, and generally could achieve better shooting quality. However, if it was a wide-angle lens with a constant large aperture, it would be relatively expensive. 2. ** Non-constant aperture lens (Floating aperture lens)** - The aperture of the lens would change accordingly with the focal length, such as 18 - 300mmF3.5 - 5.6, 100 - 400mmF4.5 - 5.5, etc. In addition, the aperture value was marked with the letter f. The smaller the f, the more blurred the background of the subject and the lighter the depth of field. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Household Xiaomi surveillance camera lens
There were many models of Xiaomi home surveillance cameras, and the functions of different models were different. Some of Xiaomi's home surveillance cameras had higher resolution lenses. For example, the Xiaomi smart camera C500 dual camera version had four million resolution, and the angle of view was large and could be seen clearly when zoomed in. The Xiaomi smart camera C700 had eight million resolution and 4K image quality. The lens could be rotated 360 degrees horizontally and 110 degrees vertically, which could accurately identify the movement of people and prevent visual blind spots from appearing. There were also some models with multiple functions, such as infrared night vision, intelligent tracking, support for two-way voice intercom, etc., and played an important role in ensuring family safety, such as monitoring the situation at home through AI humanoid detection, AI Face Recognition, and other functions. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The parameters of a single-lens reflex camera
The following are some important settings for a DSLR camera: 1. ** Shooting Mode **: It is recommended to choose the manual mode (M). This way, you can control the shutter, aperture, sensitivity, and other parameters independently. 2. ** Video recording format and size **: If there are no special requirements, you can choose to record 1920*1080, 25 frames, MOV format of high-definition video. If there are special requirements for zooming in, you can choose 4K or other format. 3. ** Shutter Speed **: Generally, it is twice the frame rate of the video. For example, when the frame rate is 25 frames, the shutter speed is set to 50; when the frame rate is 60 frames, the shutter speed is set to 120. This way, the visual effect can be achieved. 4. ** Aperture **: The aperture size affects the depth of field of the picture. A large aperture (such as F2.8) made the picture brighter and the background blur stronger, while a small aperture (such as F11) made the picture darker and the background blur weaker. The larger the aperture value, the smaller the actual aperture. 5. ** Light sensitivity (USB)**: When there is sufficient light, the lower the USB, the better. It is not advisable to set it too high in a dark environment, otherwise it will produce noise. For example, Canon DSLR can be set to 100 during the day and 800 - 1000 at night. A high USB (greater than 2000) will produce obvious noise and it will be difficult to repair later. 6. ** Color temperature (white balance)**: adjust to manual mode. Generally, it is recommended to adjust the color temperature between 4900 and 5300. The higher the color temperature, the more yellow the screen will be, and the lower the color temperature, the more blue the screen will be. 7. ** Focus **: If you have good manual operation ability, you can try to manually focus and select the focus point. Novice or for convenience, you can use the automatic intelligent autofocus. However, it is recommended to practice manual focus more if possible. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
General settings of camera lens parameters
The camera lens parameters generally included aperture, shutter speed, sensitivity, mode dial, and other settings: ** 1. Aperture ** 1. ** Relationship between values and light input and depth of field ** - Aperture is often expressed as F/x (or Fx). The smaller the x value, the larger the aperture, the more light entering, the smaller the depth of field, the clearer the focus subject, and the blurred background and background. It is suitable for taking close-up photos such as people and still objects. The larger the x value, the smaller the aperture, the less light entering, the larger the depth of field, and the clearer the picture elements. It is suitable for taking scenery, group photos, and so on. 2. ** Adjusts according to the brightness of the photo ** - When the photo is dark, you need to open a large aperture; when the photo is bright, you need to close the aperture. ** 2. Shutter Speed ** 1. ** Relationship with exposure time and photo brightness ** - The shutter speed was measured in seconds. The longer the exposure time, the brighter the photo. High-speed shutter (short exposure time), such as 1/500 seconds, can capture the instantaneous posture of high-speed moving objects; slow shutter (long exposure time), such as 4 seconds, can record the moving trajectory of light spots, used for shooting waterfalls, light paintings, car tracks and other subjects. 2. ** Choose according to the subject ** - When shooting people or moving objects, the shutter speed can be set to more than 1/200s to ensure that the moving objects are shot clearly. The slower the speed, the more likely it is to have a smear when shooting moving objects. ** 3. Light sensitivity (USB)** 1. ** Relationship with image quality and brightness ** - The higher the value, the brighter the photo, but the more noise, the more sensitive the camera was to light. The lower the value, the darker the photo, and the less noise, the less sensitive the camera was to light. Usually, it was manually set to a lower value, such as 100 - 400, to ensure the clarity of the image. 2. ** Adjusts according to lighting conditions ** - When the light is strong, the USB can be set to 100, and when the light is weak, the USB can be set to 400 or less, and try not to exceed 800. ** 4. Mode Wheel ** 1. ** Automatic exposure mode ** - The camera automatically selected the exposure parameters according to the brightness of the captured image. The photographer only needed to press the shutter to shoot. 2. ** Semi-auto exposure mode (P, Av, Tv)** - ** Program auto exposure mode (P)**: Control the brightness of the image through exposure compensation. If the image is dark, increase the exposure compensation. If the image is bright, decrease the exposure compensation. - ** Aperture priority mode (Av)**: Set the aperture manually. The USB can be set manually or automatically. The shutter speed will change automatically according to the light measurement results. The brightness of the image will be controlled by exposure compensation. It is suitable for shooting still objects. - ** Shutter priority mode (Tv)**: manually set the shutter speed, the USB can be set manually or automatically, the aperture is automatically adjusted according to the light measurement results, and the brightness of the image is controlled by exposure compensation. Different scenes had different settings for the camera lens. For example, when shooting scenery (M file), you can set the settings to around 100, F8, and 1/200 on a sunny day, and 400 on a cloudy day. For shooting still life, flowers, fish and insects (Grade A), aperture F5.6 and above should be as large as possible, focal length 50 and above, strong light source should be 100, weak light source should be 400 and below, try not to exceed 800. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Phone lens detailed technical parameters
The following are some of the detailed technical parameters of the phone lens: 1. ** Focus ** - The unit was in millimeters, which determined the field of view and the proportion of the scene in the picture. The smaller the focal length, the wider the field of view, the wider the viewing range, and the smaller the proportion of the scenery in the picture. The larger the focal length, the narrower the field of view, the narrower the viewing range, but the larger the proportion of the scenery in the picture. For example, the focal length of the main camera (wide-angle lens) was between 24mm and 35mm, and there were also 400mm telephoto fixed-focus lenses. 2. ** Aperture ** - The aperture size determined the amount of light that entered the lens. The smaller the aperture number, the larger the aperture. Under the same conditions, the larger the aperture, the more light reached the sensor. In low-light environments, the brightness of the screen would be higher. A large aperture could also increase the shutter speed and produce a better background blurring effect. At present, the aperture of a good mobile phone was generally above F/2.4, and the aperture of a common mobile phone lens was between f/1.4 and f/2.8. 3. ** Shot Group ** - It was usually composed of multiple lenses. Now, the mobile phone lens group was usually 4, 5, or 6 pieces, of which 5 pieces were labeled as 5P, 6 pieces were labeled as 6P, and the flagship phone was generally 7P, 8P, and so on. Different manufacturers and products used different technologies. The quality of the lens could not be judged solely by the number of lenses and lens groups. 4. ** Material of lens ** - It was mainly divided into two types: glass and plastic. Glass had better light transmission, better optical performance, and better image quality, but its cost was higher and its molding ability was not as good as plastic. In addition to mid-to-high-end models or mobile phones with camera functions, many mobile phones used relatively low-cost plastic lens sets, while sapphire and gorilla glass lenses were mostly the "protective glass" of the lens, which did not improve the image quality. It only determined the lens 'wear resistance. 5. ** Pieces ** - It was one of the important indicators to measure the quality of the camera. 6. ** Anti shake ** - It was divided into optical image stabilization (OIS) and electronic image stabilization (EIS). The optical image stabilization could be understood as mechanical image stabilization. The AI would adjust the angle of the lens according to the feedback parameters of the pendulum (usually within 3°) so that the lens was always facing the center of the scene. The electronic image stabilization could be understood as the trimming image stabilization. The AI would cut off a part of the four sides of the picture according to different proportions according to the feedback parameters of the pendulum to form the effect of "the lens is always facing a point". <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Industrial lens parameters detailed explanation
The parameters of an industrial lens included the following important aspects: ##1. Focus (EFL) 1. ** definition and essence ** - The focal length is the distance from the main light point of the optical system to the focal point. The distance from the topmost lens to the back focal point is called the back focal length, and the distance from the bottommost lens to the front focal point is called the front focal length. It was an indicator of the ability of an optical system to converge or diverge light. 2. ** Relationship with field of view ** - For the same sensor, the longer the focal length of the lens, the smaller the field of view, and the smaller the field of view. Conversely, the smaller the focal length, the larger the field of view, and the larger the field of view. ##2. Field of View 1. ** Meaning ** - It refers to the range of the image that the lens can capture, usually expressed in terms of field of view. ##3. Magnification 1. ** Concepts ** - Magnification refers to the ratio of the size of the image to the size of the object. ##4. Chip size 1. ** Selection Principle ** - To choose a lens with a larger compatibility, if the target surface of the CCD-chip is 1 ", the lens should at least use a lens with a maximum compatibility of 1". A 2/3 "lens is not suitable. ##5. Numeric Aperture UA 1. ** Impact on the camera ** - It would affect the resolution and aperture of the lens. The larger the UA value, the better the lens resolution and aperture. The resolution calculation formula is: resolution = 0.61* Lambda/UA (Lambda is the light source's wavelength). At the same time, effective FNO = optical magnification/(2xUA). ##6. Aperture Number (F.No) 1. ** Concepts ** - The aperture number (F.No) was the ratio of focal length (EFL) to the entrance pupil (D, the image of the aperture in the object space), which was F.No = EFL/D. 2. ** Impact on the picture ** - The size of the F.No number would affect the brightness of the screen, the depth of field, and the sensitivity of the installation. ##7. Working Distance WD 1. ** Concepts ** - It refers to the distance between the bottom of the lens and the surface of the object. In the machine vision optical system, the required space had to consider the length of the camera lens group itself and the working distance of the lens. If the space could not satisfy the sum of the two, it was necessary to consider changing the working direction of the prism or re-designing the optical system. ##8. DOF 1. ** Relationship with focal length and working distance ** - The relationship between depth of field and focal length was that the longer the focal length, the smaller the depth of field, and the shorter the focal length, the greater the depth of field. The relationship between depth of field and working distance was that the shorter the working distance, the closer the lens was to the object, and the smaller the depth of field. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The parameters of a single-lens reflex camera in the studio
When shooting in the studio, the parameters of the single-lens reflex camera were set as follows: 1. ** Light sensitivity (USB)**: Due to the strong lighting in the studio, the sensitivity does not need to be too high. It can be set to a lower value, such as USB 50 or USB 100. 2. ** Metering method **: You can choose according to the subject. Matrix Metering is suitable for shooting natural scenery; Center Metering focuses on the central area of the picture, suitable for shooting portraits; Spot Metering focuses on the small area in the center of the picture. 3. ** Aperture and Shutter **: If you use the M mode, you need to set the aperture and shutter according to the light intensity in the studio and the light measurement results. You can also try taking a gray or white card, customize the white balance, check the highest sync speed of the flash, and then set the photo format. After the adjustment was completed, he could take a test shot. Then, he would connect the card to the computer and open the picture for comparison analysis and adjustment. If you use a constant light source to shoot still objects, it is recommended to use aperture priority and spot measurement. First, choose the depth of field according to the desired shooting effect, and then choose the aperture according to the depth of field. The camera will automatically match the shutter speed according to the ambient light. 4. ** White Balance **: If you use a constant light source, in order to accurately control the color temperature, it is recommended to use a gray card to correct the color temperature of the camera before taking a photo. 5. ** Lenses Setting **: Turn on surrounding brightness correction to reduce dark corners, turn on distortion correction, and select criteria for digital lens optimization. 6. ** Focus Mode **: You can set AF-ON to switch between single-shot focus, autofocus, and servo-autofocus. The setting step is to click AF-ON, then click the menu key (Menu). In the pop-up menu, choose the second camera setting from the right in the first layer of the menu. In the second layer of the menu, choose 3, and choose the custom button. Find AF-ON, which is the autofocus start button. 7. ** Image confirmation **: Generally, 2 seconds is enough. You can check the rough effect of the photo after the shooting. 8. ** High Iso-noise reduction setting **: If you are in an extremely dark environment without a lamp or tripod, you can set a high Iso-noise reduction setting to adjust the brightness of the screen. However, this method is not a long-term solution. If the environment is not bright enough, it is best to use lighting equipment. 9. ** Release the shutter without a memory card installed **: Choose to close the shutter to avoid accidentally pressing the shutter when the memory card is not installed. 10. ** Gridline Setting **: You can set it to 3x3 gridlines for easy composition. 11. ** exposure simulation **: When exposure simulation is enabled, what you see is what you get. The image you see on the screen is basically the same as the photo. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Take the parameters of the single-lens reflex camera
The following are some parameters that can be used as a reference when shooting car tracks: 1. ** Shutter Speed **: You can choose the shutter priority mode, and the shutter speed can be adjusted to 3 - 10 seconds. When shooting the tracks on the mountain road, due to the small number of vehicles, you can use Door B to manually control the shutter speed when you see the car to record the track of the car. You can also set the shutter speed to 3 - 30 seconds. The longer the exposure time, the more obvious the effect of the tracks. 2. ** Light sensitivity (USB)**: It is recommended to set it to 100 to reduce noise and ensure image quality. In the case of insufficient light, try not to exceed 6400. If it is too dark, consider using a fill light. 3. ** Aperture **: You can use automatic adjustment first. If you use the aperture priority mode for experimental photos, you can also refer to this setting if you choose f/8 aperture to achieve a suitable exposure combination. If you are taking a group photo with a similar scene, you can also set a small aperture of about f8 to ensure the picture is clear. In addition, a tripod, shutter release, and other equipment were needed to assist in the shooting. Under long exposure, noise reduction and lens anti-shake needed to be turned off for a long time. During the shooting process, a few more photos were taken to select satisfactory photos. Later, the color temperature was adjusted appropriately to achieve a satisfactory effect of the environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>