常规单反镜头的参数辨别（The parameters of conventional SLR lens are distinguished）.docVIP

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常规单反镜头的参数辨别（The parameters of conventional SLR lens are distinguished）.doc

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常规单反镜头的参数辨别（The parameters of conventional SLR lens are distinguished）

常规单反镜头的参数辨别（The parameters of conventional SLR lens are distinguished） Both applied to traditional film SLR camera lens and the growing popularity of special digital SLR camera, its lens logo in the text, are basic contains a lens properties, focal length, aperture parameters, the characteristic parameters and other information. The following four points can be summarized as follows: Camera property: usually the lens is AF or EF, and usually includes some type of lens; Focal length parameter: indicates the focal length of the lens and the unit is mm; Aperture parameter: represents the maximum aperture coefficient of the lens, and some lenses also identify the minimum aperture coefficient of the lens. Features: the characteristic techniques used in the camera lens; This is the key explanation of the latter. This information is usually in the form of the image above, where we can obtain information of CANON ZOOM LENS ef-s 10-22mm 1:3.5-4.5 USM. This information allows us to read the full parameters of this lens: the autozoom lens of the original EF -s electronic card. Focal length 10-22mm (ultra wide Angle 2x zoom); Maximum aperture coefficient 3.5 to 4.5; USM ultrasonic motor was used. In addition, the serial number is also one of the common identifying text contents, which indicates that the lens belongs to the first generation of products in the same specification lens. = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Focus: The focal length of about 10mm is ultra wide Angle focal segment. Mainly used for landscape photography, documentary photography and so on, the Angle is very large, it has the impact. The focal length of about 24mm is small wide Angle, mainly used for landscape photography, documentary photography, etc., which is good for tourism souvenir photo. The focal length of about 50mm is the standard focal segment, which is accessible and less deformed. It is mainly used for landscape photography, portr