请注意，这是非常重要的设置相机的胶片回来大小正确如果焦距测量在任何单位除了像素被进入。
Note that it is very important to set the camera film back size correctly if focal length measurements in any units other than pixels are being entered.
方法：使用电热干燥箱作热源，用密度计测量胶片上各级灰阶的密度。
Methods: to employ an electrothermal drier as a heat source and measure density of grey scale in film with a densitometer.
应用胶片特性曲线、曝光曲线，从实验角度测量了厚度宽容度，并对结果作了分析和讨论。
Using film characteristic curve and exposure curve, the thickness tolerance was measured experimentally, and the result was discussed.
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