使用方法：

1，在明亮光线下，用三脚架，正对准中心十字标（垂直），对焦（自动，手动均可），自拍或者预升反光板或快门线拍摄，用盖镜头最大光圈以最浅景深便于检测。

2，看结果，应对是对焦点十字线最清晰，也就是0刻度最清晰，其他刻度模糊且越远离0刻度越模糊，如果跑焦，就是0刻度模糊，其他部位清晰。并且哪个部位数字清晰就跑到哪里了，跑了多少一目了然。
 

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值得说明是，普通摄影镜头多少都有跑焦现象，有些是很小很小，得用仪器测试。但对于人眼来说，看不出来、也无所谓的，大家熟悉景深的原理、弥散圆的原理就明白了。不必过分担心跑焦问题。

即便是1、2厘米少量跑焦，但对于用小光圈拍摄风景类的照片，更没有什么影响。
但对于拍摄只有几厘米大的物体--微距摄影来说，应该引起重视。有些人喜欢用大光圈拍摄MM的头部特写，那就要注意，否则可能是鼻尖清晰而作为重点的眼睛却相对模糊。Instructions:

1， in bright light， use a tripod， is aligned with the center of the cross mark (vertical)， AF (automatic， manual available)， the self-timer or mirror lockup shooting or shutter， with maximum aperture of the lens cover to facilitate the most shallow depth of field testing.

2， look at the results， is to deal with the clearest focus crosshair， 0 scale is the most clear， blur and more distant from the other scale 0 scale more blurred， out of focus if， that is， 0 fuzzy scale， clear other parts. And which parts of the figures clearly went where， and how much ran at a glance.
 

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Worthy of note is that the number of ordinary photographic lens has run focus phenomenon， some are very small， starting a test instrument. But for the human eye can not see， it does not matter， we are familiar with the depth of field principle， the principle of the circle of confusion will understand. You do not have to worry too much out of focus problem.

Even a small amount of 1，2 cm out of focus， but with a small aperture shooting scenery like photos， but there is no impact.
But only a few centimeters for shooting large objects - Macro photography， we should pay attention to. Some people like to use a large aperture shooting MM head close-up， it should be noted that it may be clear and the nose as the focus of the eye is relatively vague.