Lens are not unfamiliar to us. As an indispensable and important role in the SLR system, lenses allow light to enter the camera and focus light, and form a clear image on the photosensitive element.
Understanding camera lenses
Understanding camera lenses - from types, structures to digital identification
Lens are not unfamiliar to us. As an indispensable and important role in the SLR system, camera lenses allow light to enter the camera and focus light, and form a clear image on the photosensitive element.
It not only controls the shooting angle, but also determines the quality of the shooting.
However, the structure and type of lenses are relatively complex, such as: how to use the different rings on the lens; what do the letters on the lens mean, and so on. Many friends who are new to photography are in trouble in choosing and using them.
Here we will explain SLR lenses in detail from the perspective of lens classification, structure, and identification.
Classification of lenses
From the hardware properties of the lens, fixed-focus lenses and zoom lenses are the two main categories of SLR lenses. Further subdivided into standard zoom lenses, ultra-wide-angle lenses, and special lenses, the most commonly used are ultra-wide-angle lenses and standard zoom lenses.
Fixed focus and zoom
Zoom, like a telescope, can adjust the focal length by telescoping, and change the focal length by pushing and pulling the lens. It can generally be used to take photos at a long distance.
Fixed focus, that is, the focal length is fixed, the field of view is relatively fixed, and the distant image cannot be brought closer. There is no zoom ring on the lens.
Autofocus and manual focus.
Autofocus "AF" means that the camera itself will identify and focus on the object, which can save the trouble of manual focus. Today's SLR cameras have this function, and generally half-pressing the shutter button can automatically focus.
Manual focus "MF" means that you must focus by turning the focus ring of the lens. General autofocus lenses support manual focus to assist in focusing in some special scenes.
Lens structure
A simple light-transmitting structure has developed to today and has very complete functions, such as autofocus, changing the amount of light transmitted, and variable focal length. To use all of this reasonably, you must first understand them.
A general SLR lens consists of five parts: lens, zoom ring, focus ring, distance scale, and aperture blades.
