SLR camera lens specifications how to see

Answer:

Part III: Maximum aperture of the lens F / 4-5.6 that the lens maximum aperture, that is, the maximum brightness of the lens value. Fixed focus lens with a single numerical representation, zoom lens constant aperture lens (that is, the maximum brightness does not change with the focal length changes) using a single numerical representation, the maximum aperture value changes with the focal length of the lens, respectively, wide-angle end and telephoto end of the largest aperture

Part II: lens focal length 55-250mm Indicates the value of the lens focal length. The fixed focus lens is represented by a single numerical value, and the zoom lens marks the values ??at both ends of the focal length range. 55-250mm that this is a zoom lens, the minimum focal length of 55mm and the maximum focal length of 250mm direct zoom

The first part: the type of lens EF is the English Electronic Focus abbreviation, translation is "electronic focus", EF is Canon EOS camera lens mount name, all Canon original lens models are EF beginning The lens with EF-S is a special lens for the APS-C size image sensor model in the Canon EOS digital SLR camera. S is the acronym for Small Image Circle, and the APS-C frame sensor area is small , Its professional lens imaging circle also correspondingly reduced

Part IV: Other features of the lens IS stands for the image stabilization feature of the lens, IS is the abbreviation of Image Stabilizer, which means that the lens is equipped with an optical hand shake compensation mechanism, that is, the general anti- II represents the design algebra of the lens, the lens basically uses the same optical design structure, only in the details of the slight difference when adding the mark, II said the same optical structure of the second generation of the lens ? General home Canon SLR, on the 650D bar, the budget limited selection of 18-55 lens, the budget can be selected more points 18-135 lens