The auto-focus of the lens does not stop
The non-stop autofocus action of the lens may be caused by the following reasons: 1. ** Problem with camera settings ** - ** Wrong lens mode setting **: Check whether the mode switch on the lens is set to autofocus mode (AF.) This problem may occur if it is set to manual focus mode (MT) by mistake. - ** Inappropriate focus mode setting **: It is important to choose the appropriate focus mode according to the shooting scene. For example, for a still subject, you should choose single autofocus; for a moving subject, you should choose continuous autofocus, otherwise it may cause autofocus abnormalities. - ** Wrong focus point selection **: Make sure the focus point is selected correctly and corresponds to the subject. The wrong focus point selection may cause the autofocus to malfunction, causing the focusing action to stop. - ** Problem with the camera and lens's firmwares or software version **: Try to update the camera and lens 'firmwares or software to the latest version. The old version may have loopholes or unstable factors in focusing. 2. ** environmental factors ** - ** Main body in low-light environment **: In low-light environment, autofocus may have a "bellows" situation, where the lens moves back and forth to capture the focused object but never catches it, causing the autofocus to not stop. - ** Single color subject **: When the subject is in a single color, the autofocus system may have difficulty accurately identifying the focus position, causing the focus action to not stop. - ** When the camera is very close to the subject **: In this case, the autofocus may not be able to focus properly, causing the focusing action to continue but not be able to focus accurately. 3. ** Equipment Failure ** - ** Sand or dust enters the lens **: If sand or dust enters the lens, it may affect the autofocus mechanism of the lens and cause the focusing action to stop. Fine sand particles entering the lens may adhere to the lens and affect the focus, or enter the mechanical parts of the lens (such as the focus drive system), causing mechanical failure and operational problems. - ** Focus motor malfunction **: For example, if the focus motor of the 2S lens of the D.J.I. drone is stuck, it will cause the focus to be unable to be switched, and the AF-TF cannot be switched. The camera lens may also have a similar focus motor malfunction, causing the autofocus to not stop. - ** Dirty or poor contact point between lens and camera **: If the contact point between lens and camera is dirty, dusty, or poor, the autofocus function may be affected, resulting in non-stop focusing. The solution was as follows: 1. ** Check and adjust camera settings **: Make sure all settings are correct, including focus mode and focus point selection. 2. ** Clean the contact point between the lens and the camera **: Make sure that the contact point between the lens and the camera is clean and dust-free to avoid problems caused by poor contact. 3. ** Clean the inside of the lens (if necessary)**: If you suspect that there are foreign objects inside the lens that affect the focus, you can seek professional maintenance personnel to clean it. 4. ** Try manual focus **: If the autofocus fails, you can try to use the manual focus function to shoot. 5. ** Seek professional help **: If the above methods cannot solve the problem, it is recommended to contact the camera manufacturer or professional repair service for further inspection and repair. Read more exciting novels for free
Focus the lens
Theoretically speaking, lens focusing was to change the image distance (v), which was the distance between the lens 'optical center and the film plane. For a microscope, it was the process of adjusting the distance between the objective lens and the object to obtain a clear image of the object. In a camera, focusing (focusing, focusing) was to adjust the focus of the lens to the exact position of the subject to take a clear picture. Whether the subject was still or moving, accurate focusing could ensure that the subject was clear. Except for some low-end camera lenses that could not change the image distance because they did not have a focusing mechanism, other lenses, whether fixed-focus or zooming lenses, could change the image distance to get a clear image. In lens imaging, the image has the clearest position on the screen (camera film or sensor). Countless such points form the focal plane. Focusing is to change the front and back position of the focal point to satisfy the imaging formula 1/u + 1/v = 1/f (u is the object distance, v is the image distance, and f is the focal length), so as to form a clear image on the film. When shooting distant objects, the object distance was far greater than the focal length, and the image distance was close to the focal length and almost unchanged. At this time, the concept of "depth of field" was also involved to ensure the imaging effect. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Nikon 7200 manual focus lens
There were some key points when using a manual focus lens on the Nikon D7200. Some manual focus lenses may not have the integrated Nikon manual lens focus prompt function. On the Nikon D7200, although the 50mmF1.8D lens did not have a body focusing motor, it could use the D7200's body motor to drive the lens focusing component to achieve autofocus. When the D7200 could not autofocus, the possible reasons included the focus distance exceeding the closest focus distance of the lens, the camera was set to manual focus mode, the focus point of the telephoto lens was not suitable, there was no obvious light and dark boundary near the focus point, the light was too weak, the focus screen was shifted, the focus screen was blocked by dust, the camera was seriously out of focus, the focus unit was damaged, and so on. In terms of manual focus, for example, when shooting star trajectories, the focus mode can choose single-point focus.(landscape, portrait, or building, etc.), adjust the camera shooting mode, choose the lighting angle, use the raw format to balance the light sense to achieve the best effect, and pay attention to the image quality. During the focusing process, gently press the shutter and wait for the focus to be completed before completely pressing the shutter to shoot; You can also turn the mode dial to M, turn the main command dial to select the shutter speed B (bulb), turn the auxiliary command dial to select the aperture, press the shutter button to start the exposure after focusing, and press the shutter button again to end the exposure. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Soft focus artistic lens
Soft focus artistic lens was a kind of lens that could produce soft focus effects. For example, the Daguerretype Achromat 2.9/64 Daguerretype soft-focus art lens had a focal length of 64mm and an aperture of f/2.9 - f/16. It used the Waterhouse aperture system, with Canon EF mount, Nikon F mount, etc., which could be used with a variety of cameras. It could shoot different effects through different apertures. For example, if you used the f/2.9 aperture, you could shoot a transparent soft focus image. If you switched to the f/5.6 aperture, you could get a sharp and clear image. In addition, there were also special aperture films, such as the Lumière aperture film, which allowed the image to be surrounded by natural soft light, and the Aquarele aperture film, which could produce the effect of oil painting strokes. Soft focus artistic lens could be used for portraits, scenery, and other photography. It could make the subject's focus clear, soft, and beautiful, and take photos with unique artistic effects, such as increasing the softness and haziness of the image, adjusting the tone, and reducing the contrast. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How does the lens focus?
How to choose the focus of the lens
There were two main methods of lens selection: autofocus (AFF) and manual focus (MT). ##1. Automatic Focus (AF.) 1. ** Single Point Focus **: This is a common autofocus mode. The camera automatically detected and locked onto this point to focus. It was suitable for situations where one wanted to accurately focus on a subject. 2. ** Continuous Focus (AI Servo / Continuous AF.)**: It is suitable for shooting fast-moving subjects, such as athletes or running animals. The camera would continuously focus on the moving subject to ensure that the subject remained clear during the movement. 3. ** Area autofocus **: - There were also square, vertical, and horizontal focusing methods. When shooting, the selection can be made according to the characteristics of the captured scene. For example, when shooting a scene with a regular shape distribution, the corresponding area focusing method can be selected according to the shape layout of the scene to better focus on the main body in the picture. - Some cameras had different types of AFs depending on the characteristics of the subject. For example, Canon's Eos70D had three types: ONE SHOT (Single Flash AFs), AI Focus (Artificial Intelligence Focus AFs), and AI Servo (Artificial Intelligence Servo AFs). - ONE SHOT: Once the shutter button is pressed halfway, the camera will start autofocus. Once it is in focus, the focus position will not change. It is suitable for shooting still objects. - AI Servo (Artificial Intelligence Servo-auto Drive): When the shutter button is half-pressed, the focus will move with the object even if the object is moving. ##2. Manual Focus (MV) 1. ** Operation method **: Switch the focus mode of the lens to MV, then look at the viewfinder or LCD monitor while rolling the focus ring of the lens to focus. 2. ** Usage **: - In some special shooting scenes, manual focus was more advantageous. For example, in macro photography and night photography, autofocus might not be able to accurately focus on the desired subject. Manual focus allowed the photographer to accurately adjust the focus position according to his own creative intentions. - In complex environments with low contrast, low light, or interference, autofocus may have difficulty finding the focus or focus errors. Manual focus can rely on the photographer's experience and skills to complete the focus. - If you want to create a special artistic effect, such as deliberately focusing on an element in the background to create a unique layering and artistic conception, you can use manual focus. In actual shooting, such as shooting a large scene (wide field of view, large depth), you can use a small aperture with "hyperfocal focus" to make most of the picture as clear as possible. When operating, you can first twist the focusing ring to the "infinite distance" position, then find the clear scene closest to the lens (hyperfocal point) and focus on this point. When taking portraits, if the proportion of the face in the picture was not large, consider focusing on the face first; when taking headshots and close-ups of the face, focus on the eyes. Focus on still objects when shooting long exposure shots such as flowing water and traffic trails. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Selection of camera lens for auto show photography
The choice of camera lens for an auto show required a comprehensive consideration of many factors. In terms of telephoto lenses, for example, 85mm lenses had many applications in auto show photography. Large aperture (such as F1.4, etc.) telephoto lens could blur the background, remove the elements unrelated to the theme, and focus on the details of the vehicle. For example, when shooting Cadillac CT6, the large aperture telephoto lens could blur the lights on the booth and create a special atmosphere. At the same time, when shooting, the telephoto lens could be used to control the focal length and find the appropriate shooting distance to shoot the desired effect. For example, when shooting the bokeh effect, the telephoto lens could be used. If you choose a full-frame camera with a zoom lens (such as the Tenglong 28 - 75mm f2.8), this lens is easy to zoom and can adapt to the size of different shooting venues at the auto show. When the venue was small or the camera needed to be shot in a crowd, the 28mm wide-angle end could play a role; when shooting people on the catwalk, the 75mm end could also meet the needs, but its aperture was relatively small. If you were pursuing a better background blurring effect (such as shooting a sugar film atmosphere), the f2.8 aperture would be slightly insufficient. For some mobile phone photography, if the quality of the mobile phone lens was good, such as the Vivo X100 Pro, which could support up to 100mm optical focal length lens, it could also meet the needs of auto show shooting. The different focal length lenses (such as 15mm wide-angle lens) could cope with different shooting scenes in the auto show. For example, the 15mm wide-angle lens could include more people in the picture and control the edge distortion. In addition, if you want to shoot a close-up of a car model or the local details of the car, the large aperture lens can highlight the main body by blurring the background. If you want to shoot a full-body image of the car model or show the overall scene of the car show, you have to choose a suitable focal length lens according to the venue situation and shooting distance to avoid being unable to shoot the ideal picture due to the size of the venue, the shooting distance, and the lens focal length. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is a fixed-focus lens suitable for?
The fixed-focus lens was suitable for shooting various subjects, including portraits, scenery, indoors, and environments. Canon's 35mm fixed-focus lens was suitable for shooting culture and scenery. It was especially suitable for shooting small scenes of culture and scenery. It focused quickly and was often used to shoot landscape portraits and indoor portraits. Canon's 50mm fixed-focus lens was a standard lens. Its angle of view was similar to that of the human eye. It was suitable for shooting long-distance scenery and people. It had a bright and blurred effect. The quality of the image was excellent and practical. It was the first choice for group photos. Canon's 85mm fixed-focus lens was the golden focal length of portrait fixed-focus lenses. It was suitable for shooting portraits and had good image quality and practicality. As for the 135mm fixed-focus lens, some people called it a conscience lens. It was cheap and practical, so it was popular with everyone. In general, the fixed-focus lens was suitable for shooting various subjects, and the image quality was better than the zoom lens.
Nikon 200F2 fixed-focus lens
The Nikon 200mm f/2G ED VR II was a professional portrait fixed-focus lens, also known as the "air cutter." It could handle exciting moments in sports events, but it was best to use a tripod to shoot because the lens was heavy, about 2930g, and the camera weighed more than 4100g. The lens had excellent resolution and sharpness. It used a super ED lens to suppress the dispersion phenomenon, and with a nano-crystal coating, the dispersion control effect was especially good. In terms of performance, before the aperture of F4, the blurring was natural, and the sharpness reached its best when the aperture contracted to F4 - F5.6. The sharpness of F8 began to decline. The anti-shake feature was VR II, which could increase the shutter speed by about four stops. When the anti-shake function was turned on, a relatively clear and sharp image could be obtained regardless of whether it was in Normal mode or Active mode. Its parameters were: the lens weight was about 2930g, the diameter x length (extended from the lens mount) was about 124mm (maximum diameter) x 203.5mm (calculated from the lens mount), the closest focusing distance was 1.9m, and the filter size was 52mm. It was a fast telephoto lens with a shock absorption function of VR II. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The telephoto lens is sometimes out of focus
There were many reasons why a telephoto lens could not focus clearly. On the one hand, because telephoto lenses needed to shoot from a long distance and had a long focal length, the accuracy and speed of the lens focusing might be limited. In low-light environments, the performance of the autofocus system would be more limited. In this case, manual focus might be required, and manual focus required a certain amount of skill and experience. On the other hand, the telephoto lens could malfunction, such as internal structure problems, such as the focusing component being stuck, which would also cause the focus to be unclear. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon 600 ff fixed-focus lens
Canon had two types of 600mm fixed-focus lenses, the RF600mm F11IS, and the RF600mm F4. The RF600mm F11IS ATM lens has the following features: - The price was relatively affordable. For example, on the e-commerce platform, the time limit of the RF600mm F11IS ATM ultra-telephoto fixed-focus lens dropped from 5298 yuan to 4499 yuan. - The lens structure consisted of seven sets of 10 lenses, a filter diameter of 82mm, a closest focusing distance of 4.5 meters, a fixed F11 aperture, and a drive unit driven by an ATM step motor. It weighed 930 grams. - It has a DO lens. One piece of DO lens can achieve the compensation effect of fluorite lens and aspheric lens. It uses a set of seamless double-layer structure DO lens, which can cause more light to be refracted, suppress glare, and improve image quality. - When paired with the RF1.4x or RF2x, they could achieve an ultra-telephoto focal length of 840mm or 1200mm respectively. - The lightweight mirror body and the IS Image Stabilizer with a shutter speed of up to level 5 provided strong support for hand-held shooting. It was suitable for shooting wild birds, animals, airplanes, trains, scenery, outdoor sports, and many other subjects. The RF600mm F4 super telephoto fixed-focus lens weighed 3090 grams. It was an excellent bird-hunting lens that could be used with the Canon R series 'small and portable body to meet the needs of high quality and lightweight. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>