The wide-angle lens has a short focal length, a wide viewing angle, and a deep depth of field.
The distortion in the perspective of the portrait is smaller, and the portrait is more vivid. Therefore, people often call the telephoto lens a portrait lens, which is often used for professional photography.
Macro lens is a special lens used for macro photography. It is mainly used to shoot very fine objects, such as flowers and insects.
Shift lens is mainly used for architectural photography and advertising photography, etc., to correct perspective distortion, adjust the focal plane position, and avoid the large and small convergence effects.
A teleconverter is also called a teleconverter. It is an optical accessory installed between the lens and the camera body. It is a lens accessory that extends the focal length to 2 or 1.4 times.
Fixed focus lens
Especially refers to a lens with only a fixed focal length, only a focal length, or a field of view. The biggest benefit is the fast focusing speed and stable imaging quality.
A zoom lens is a camera lens that can change the focal length within a certain range to obtain different angles of view, different sizes of images, and different ranges of scenes.
APS format lenses are specially made for APS format SLR bodies. The area of the photosensitive elements covered is smaller. When used on a full-frame camera, a black circle around it is likely to appear. Full-frame lenses are generally available on APS and full-frame bodies.
The thread of the camera lens port is used to connect various filters and external lenses. The size of the filter depends on the size of the lens and has nothing to do with the camera model.
It is the relative value of the focal length of the lens / the clear diameter of the lens. The aperture value is represented by "F". The larger the "F" value, the smaller the aperture. On the contrary, the smaller the "F" value, the larger the aperture.
Aperture blade number
The number of aperture blades refers to the number of blades used to adjust the aperture in the lens. Generally, the larger the number, the higher accuracy can be achieved when the aperture is adjusted.
It means that the original imaging area of the subject can be changed by adjusting the lens. Although it is called magnification, some lenses may play a role in zooming out.