值标度

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标在光圈调整环上表示光圈开度大小的数值.f值P通常是按平方值递减或增加一倍的,相应的光圈面积每格减小一半.光圈的标度分格为:f1、f1。4、f2、f2。8、f4、f5。6、f8、f1、f16、f22等.开度最大时f值最小.有些镜头的光圈标度不一定完全相同,但一些较小的光圈数值都是相同的.专业摄影用的多透镜组合镜头,由于光学镜组本身有吸光作用,因此几何上的f值并不能准确地反映出真正的透光量,通常用T-格值来表示一个无吸光损失的标准镜头的f值. Marked on the aperture adjustment ring, said aperture opening size of the value. F the value of P is usually reduced or increased by the square of twice the value of the corresponding aperture area is reduced by half for eachgrid. Aperture of the sub-grid scale is: f1, f1 . 4, f2, f2. 8, f4, f5. 6, f8, f1, f16, f22, etc.. opening the largest f value of the minimum time. Some of the lens aperture scale is not necessarily identical, but some smaller aperture value are the same. professional photography combined with the multi-lens camera, asopticallens groups have their own absorption effect, so geometry on the f values and not accurately reflect the true amount of light transmission, usually expressed in T-cell values of a non - absorption loss of the f value of the standard lens.
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