Fixed-focus lens is a fixed-focus moment, which generally has a large aperture and is more expensive.
Telefocus refers to a lens with a long focal length, generally above 70, such as a lens with a focal length of 70-200, or a fixed-focus lens with a focal length of 135mm.
Micro-focus refers to a lens that can shoot objects at close range, such as insects or flowers. The common magnification is 1: 1 or 1: 2, 1: 1 means that the size of the object that can be projected onto the film or ccd is 1: 1.
Zoom in. The lens has a wide-angle end and a telephoto end, such as .ef24/7070/200f2.817/55f2.818/55f3.6-5.6. Its advantage is convenience.
The disadvantage is that a good zoom is not cheap.
Fixed focus. Fixed focal length. Entry 50 1.8 85. The advantage is clear imaging. The disadvantage is limited and inconvenient.
There is no standard for telephoto. Generally, the telephoto is greater than 200 mm, which is basically unnecessary in daily life and inconvenient to hold.
Macro hence the name, which means close-up.
In fact, SLR lenses have no contrast.
Wide angle lens:
Refers to the lens whose focal length is shorter than the "head" and whose viewing angle is larger than the "head". For Quan Huafu 135 SLR cameras, the lens with a focal length of about 30mm and a viewing angle of about 70 degrees is called a "wide-angle lens", and the lens with a focal length of less than 22 mm and a viewing angle of more than 90 degrees is called a "super-wide-angle lens".
Features of wide-angle lens: A. The depth of field is large, which is conducive to obtaining all clear images. Widely used in the shooting of scenery films. B. The viewing angle is large, and a wider range of framing can be obtained in a limited range, especially the shooting of indoor buildings, which is widely used in the real estate industry. C. strong perspective can create a picture with strong visual impact. D. Distortion is large, especially at the edge of the picture.
Telephoto lens (telephoto):
Refers to a lens whose focal length is longer than the "head" and whose viewing angle is smaller than the "head". For Quan Huafu 135 SLR cameras, a lens with a focal length of 200mm and a viewing angle of about 12 degrees is called a telephoto lens, and a lens with a focal length of over 300mm and a viewing angle of about 8 degrees is called a super telephoto lens.
Features of telephoto lens: A. The depth of field is small, and it is easy to obtain the picture effect with clear subject and blurred background. B. The viewing angle is small, so that a larger picture of the distant subject can be obtained without disturbing the subject. Widely used in outdoor wildlife shooting. C. It compresses the feeling of jumping in perspective and shortens the distance between foreground and background. D. the image distortion is small, and it is widely used in portrait photography.