![]() Nevertheless, it is common to want to introduce deliberate motion blur into an image, to give the impression of movement. ![]() ![]() Each of these have side-effects on the image in other ways.īlender and other computer graphics software are, in principle, free of the problems of focus, exposure time, aperture, sensitivity and focal length. The brightness of the image can be affected by the exposure time, the aperture, the gain sensitivity and the focal length of the lens. It can be adjusted from a wide-angle mode to a telephoto mode.Īs you can see, many of these different factors interact with each other. You may also have heard of the zoom lens, i.e. A wide-angle lens also has a shorter focal length than a narrow-angle one (remember that aperture is expressed as a ratio of the focal length f), therefore the telephoto lens is going to capture less light than the wide-angle one with the same aperture width. At the other extreme, a telephoto lens gives a very narrow field of view, but can take pictures of things from much further away. A wide-angle lens gives a wider field of view, but you have to be closer to objects to be able to see them, and there is greater perspective distortion. ![]() the field of view - how much of the scene the camera can see at once.In a somewhat similar manner, high light-amplification in a digital camera is more likely to produce a noisy-looking image under low-light conditions. High-sensitivity film was more likely to produce a grainy image. Nowadays, with digital cameras we talk about the gain of the light-amplification system. In the days of film cameras, we talked about film sensitivity (“fast” film being more sensitive to light than “slow” film). the sensitivity of the image-capturing surface to light.The extreme case of a pinhole camera has a very tiny aperture with infinite depth of field (no need to focus at all), but captures very little light, so it needs a very well-lit scene, a long exposure, or a very sensitive image-capturing surface. A wider aperture increases the amount of light being captured without contributing to motion blur, but it reduces the depth of field. This is expressed, not as an actual distance measurement, but as a fraction of the focal length of the lens (loosely, distance between the lens and the image-capturing surface when the image is properly focused), written as f: thus, say, f/2.8 (“ f over 2.8”, not “ f 2.8”) is a larger number, hence representing a wider aperture, than f/8. the aperture - how wide the iris opening is.The longer this is, the more light is captured, but also the more likely the image is to pick up motion blur from moving objects. the exposure time - how long the shutter remains open.The narrower the range of in-focus distances (the shallower the depth of field), the more quickly this blurring happens with objects outside it. Objects outside this range will begin to appear noticeably blurred, the blur getting worse the farther they are outside the focus range. the focus - because of the way lenses work, only objects within a certain distance range from the camera (the depth of field) will appear sharp in the image.When taking a photo with a real camera, a number of important factors come into play: We have become accustomed to so many of their quirks and limitations when looking at real photographs, that 3D software like Blender often expends a lot of effort to mimic those quirks. Real-World Cameras īefore discussing the camera in Blender, it helps to understand something about how cameras work in real life. ![]()
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