Can I use a camera to take clear pictures from a distance?

The camera itself has a telephoto lens that can be used to shoot directly. If your camera can change the lens, you can use a long focal length lens to shoot. Of course, there are also experts who use ordinary cameras with telescope lenses to achieve this. Long-distance shooting requires certain conditions. First of all, you need an ordinary camera (not a point-and-shoot), and secondly, you need a suitable photography interface. Then remove the eyepiece of the telescope and the lens tube of the camera, connect the interface to the camera, and then connect it to the focusing tube of the telescope. This way you can take pictures. However, to find the target, it is recommended to use the eyepiece to find the target before connecting the camera. The next step is to twist the focusing barrel and keep staring at the camera's viewfinder until the focus is accurate and the image is the clearest. Then fine-tune it and move the image to the viewfinder. middle position. The specific exposure time is based on the brightness of the arranged object!

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Long focal length lens - introduction

The standard lens for 35mm film photography, its focal length is equivalent to 50mm, anything longer than 50mm is Long focal length lens; the standard lens for 16mm film photography, its focal length is equivalent to 25mm, anything longer than 25mm is a long focal length lens. For feature film photography, use a 75mm or 100mm long focal length objective lens to shoot close-ups or extreme close-ups. Because the camera is far away from the subject, the actor can avoid being nervous, and the Sony 70-200mm f/2.8 G - Sony's top telephoto lens is convenient for Lighting. Photographic objectives with particularly long focal lengths (such as 400, 800, 1000 mm or even longer) are called "telephoto lenses", which can capture a detail of a distant scene as a close-up, creating a screen effect in which the distant scene is moved closer. However, the pictures it took lacked a sense of space, depth and perspective. In scientific and educational films, telephoto lenses can be used to capture wild animals from a hidden distance to prevent the animals from being disturbed, thus making the pictures appear natural and real.

Edit this section Telephoto Lens - Features

Etsumi telephoto lens holder E-6247 has a small viewing angle. Therefore, the spatial range of the scene being photographed is also small. At the same shooting distance, the image captured is larger than that of a standard lens. It is suitable for photographing details of distant scenery and photographing inaccessible subjects.

The second is the short depth of field. Therefore, the subject in a cluttered environment can be highlighted. However, it brings certain difficulties to precise focusing. If the focus is slightly inaccurate when shooting, the subject will be blurred.

Third, the perspective effect is poor. This kind of lens has the characteristics of obviously compressing the depth of space and exaggerating the background.

Edit this section Long focal length lens - purpose

When a long focal length lens is used, it is generally used to shoot distant scenery. Due to the influence of air absorption and diffuse scattering of light. Therefore, the contrast of the captured image is small, and the extinction of dust particles is serious, so it is not easy to achieve very precise focusing. When shooting with a super telephoto lens of over 300 mm, it is difficult to focus light of various colors on one point, thus causing subspectral problems. Based on the above situation, sometimes the imaging quality of the captured works is not high.

Edit this section Long focal length lens-Advantages

Nikon telephoto lens AF-S NIKKOR Although the use of long focal length lenses is affected by many factors, its advantages are the main ones . When shooting scenery and people, travel photography, and portrait photography from a long distance (when taking standard photos for ID cards, use an ordinary telephoto lens of about 100 mm to reduce image distortion. If you use a 105 mm lens, the effect will be best. ), take photos of stages, sports games, etc. in the stands, take photos of animals in zoos, take photos of animals in the wild, add an auxiliary lens for close-up shots...etc., in these many fields, it is used everywhere.

When shooting with a long focal length lens, generally use fast photosensitive film and a fast shutter. If you use a 200 mm long focal length lens to shoot, the shutter speed should be above 1/250 seconds to prevent the camera from being damaged when shooting with a handheld camera. Vibration causes blurry images. When shooting under normal circumstances, in order to keep the camera stable, it is best to fix the camera on a tripod. When there is no fixed tripod, you can take pictures in several postures as shown in Figure 1-2.

Super telephoto lenses are generally used only under special circumstances. Do not use an ordinary tripod to fix the camera. Otherwise, the overweight lens will damage the camera base fixed on the tripod. Therefore, you must use a tripod that can support the lens bracket to fix the camera. If there is no such special tripod, you can use two tripods to fix it, one to fix the camera body, and the other to fix and support the super telephoto lens. It is best to use film faster than ISO400/27 degrees to ensure sufficient shutter speed. [1]

Precautions for editing this paragraph

When using a long focal length lens, you need to pay attention to the following points: ⒈Use a high-speed shutter. Because the telephoto lens is large and heavy, it is difficult to hold it firmly when shooting. In addition, the telephoto lens has a large imaging magnification. If the subject moves or the camera shakes slightly, the degree of image blur will also increase accordingly, so a higher shutter speed must be used.

The shutter speed used for telephoto lenses with different focal lengths should be higher than the reciprocal of the focal length of the lens, so as to avoid image blur caused by camera shake. For example, if the focal length of a telephoto lens used is 200 mm, the shutter speed must be within 1/ More than 250 seconds.

⒉Choose high-speed photosensitive film. Since the maximum aperture of the telephoto lens is small, in order to prevent the camera from being unstable, it is often necessary to use a higher shutter speed for shooting. It is difficult to use a medium-speed photosensitive film of ISO100 to meet the exposure requirements under high-speed shutter, so it is best to shoot with a hand-held telephoto lens. It is best to use high-speed film.

⒊ Increase exposure appropriately. This mainly refers to telephoto lenses above 200mm. Because of its long focal length, long lens body, and large number of lenses, the intensity of light reaching the film is weakened. The exposure should be increased to compensate for the loss of light. Lenses with focal lengths between 200 and 400mm should increase exposure by half a stop, and super telephoto lenses with focal lengths above 400mm should increase exposure by one step. Cameras with TTL metering are not included in this list.

⒋Add a filter. When taking long-range shots with a telephoto lens, it is easy to produce a gray phenomenon, and the scenery is not clear and translucent. This is due to the interference of ultraviolet rays and the reflection of dust and air media, which results in low image contrast, blurred boundaries, and poor clarity. Therefore, when using a telephoto lens to shoot distant scenes, it is recommended to install a polarizer and ultraviolet filter to eliminate the effects of ultraviolet rays and reflections and improve the quality of the image. Photo contrast and sharpness.

⒌Use the tripod’s stable function. There are three advantages to using a tripod when taking photos with a telephoto lens: first, using a stable tripod and then releasing the shutter with the help of a shutter cable can effectively prevent the camera from weak vibrations and ensure clear film images; second, it is beneficial to use the camera slower The shutter speed and the aperture are narrowed to overcome the disadvantage of the small depth of field of the telephoto lens; the third is to focus and frame the view more accurately. The depth of field of a long focal length lens is extremely small, especially when shooting at close range. The depth of field is often only a few millimeters. In a very short moment, it is not easy to compose the scene, focus, and hold the camera steady. A tripod can provide you with an effective help.