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. 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 to choose a camera lens
When choosing a camera lens, you can consider the following aspects: ** 1. Choose according to the shooting content ** 1. ** Street photography **: 35mm focal length is more suitable. Because the focal length was not too wide, there would be no obvious distortion at the edge of the picture, and more environmental elements could be brought in to tell the story. 2. ** Professional portrait photography **: 85mm focal length is more suitable. The key to taking a portrait was to highlight the subject, and this focal length helped to create a shallow depth of field, thereby separating the subject from the background. 3. ** Landscape photography **: You can choose the "Big Three-Yuan" lens (16 - 35mm, 24 - 70mm, 70 - 200mm focal length, different brands of wide-angle focal length may vary). ** 2. Choose according to your photography level ** 1. ** Newbie or newbie photographer **: If you are a newbie with insufficient financial resources, you can consider a "small three-yuan" lens (the same focal length as the "big three-yuan", a constant zoom lens with an aperture of F4). Its price was affordable, cost-effective, and smaller. However, for lenses with a focal length of 70 - 200mm, photography novices and novices should use them with caution in the early stages of shooting, because this focal length is difficult to control in terms of perspective and spatial sense, and it is easy to affect the basic skills such as the use of the focal length and cognition. However, this focal length also had a unique advantage when shooting busts and photos that focused on compressing the spatial atmosphere (such as oil paintings), and it was closely related to the subject. ** 3. Choose based on budget ** 1. ** Enough budget **: If you have a large budget, you can choose a higher-end lens, such as the "Big Three Yuan" lens (F2.8 constant aperture zoom lens). Its aperture is larger and the image quality is better, but the price of a single lens is often more than ten thousand yuan. 2. ** Limited budget **: You can choose entry-level lenses that are affordable to the public, such as the "Small Three Yuan" lens or some domestic lenses. However, when choosing domestic lenses or sub-factory lenses, you must pay attention to the bayonet fitting problem. ** 4. Choose according to the camera mount ** Cameras of different brands, different types (single-lens reflex or micro-camera), and different frames (APS-C frame or full-frame) had different bayonet systems, such as the Canon full-frame single-lens reflex camera's EF-bayonet, the full-frame micro-camera's RF-bayonet, and so on. When choosing a lens, make sure that the bayonet matches the camera. Even if there is an adapting ring that can be used to adapt different systems of lenses, there may be flaws in the image. Long-term use is not recommended. <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>
Streaming media lens out of focus
As for the problem of the streaming media lens not focusing, there was a problem with the focus of the Sena Platinum version of the streaming media rearview mirror. The focus was about 2 meters away from the back of the car instead of infinitely far away, causing the distant view to be blurred and the close-up view to be clear. Because it was not a wide-angle lens, the value of the close-up view was not great. In addition, there was a focus problem in the rearview mirror in the streaming media of some models (focusing again could easily cause visual fatigue), but no clear universal solution was found. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Chengdu lens can't focus
The lens could not focus in the following situations: 1. The focus distance was less than the closest focus distance of the lens. It was necessary to ensure that the position from the focal plane to the subject was not lower than the closest focus distance marked by the lens. 2. If the camera or lens is set to the MV manual focus mode, you need to check if the focus control button is in the manual focus mode. If you are in the manual focus mode, you can focus by rotating the focus ring. If you press the shutter halfway or change the camera's focus distance, you will not be able to focus. 3. There was no obvious boundary between light and dark near the focus point. For example, when shooting a subject with a single color, the camera was not easy to focus. You could find a more obvious reference object in the same plane in the picture to focus. If there was no reference object in the picture, you could change the autofocus to manual focus. 4. The light was too weak to focus. When shooting in a low-light environment, it was best to choose a scene with light and use the light as the focus point to focus. If there was no light in the scene, you could turn on the focus auxiliary light on the camera to assist in focusing (if the camera had this function). You could also use the flashlight of the phone to illuminate the scene to assist in focusing. If the lens of a Nikon micro-camera cannot be focused, you can seek professional repair services in Chengdu. Chengdu has a professional digital maintenance service team that specializes in the maintenance of Nikon micro-cameras. They can accurately repair problems such as unfocused lenses, inaccurate focusing, or slow focusing speed. They can also deal with scratches, mold, fogging, and other situations that affect the image quality of the lens. They can also repair mechanical faults such as loosening and distortion of the lens bayonet. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>