Main parameters of digital SLR camera lens is introduced

SLR digital camera photography now gradually into the people's life, and therefore more and more people love the digital SLR camera, become a new generation of trend. Most important sinus in SLR digital camera is the lens. So have some knowledge for SLR beginners to understand. Beginners to understand the lens, you should first understand the structure, diameter, aperture and focal length lens, such as basic common sense as well as some common English abbreviations on the lens of meaning, then carries on the detailed introduction.

Methods/procedures 
1) zoom ring: zoom lens is used to change the zoom ring focal length, adjust the zoom ring can change the Angle of view, prime lens because of the fixed focal length, no method to zoom.
(2) the focusing ring: turn the focus ring when the internal lens will move, can realize focus and manual focus and so on, the position of the focusing ring in different lens types varies, may be in the front of the camera or the back.
(3) distance scale: in said lens out quantity at the same time, the display of the distance between your subject scale markers, in this landscape photography when when need to far away place objects, and hope that is useful when using manual focus.
(4) lens: the lens inside including composite structure more complex lens, depending on the glass material, processing method, etc, there are different kinds of lens, because of the different combinations, the final quality also differ.
(5) the aperture blades: located in the inside lens, is used to adjust the light, the aperture blade number and position of the different lens types varies.

A good photo is to rely on to maintain a good lens, so beginners to choose to suit oneself like carefully.