最大（通常也是最贵）的当属全画幅。之所以称其为全画幅，是因为感光元件和35mm胶片尺寸大小相似。
The largest (and most expensive) DLSR format is full frame (so called because the sensor is the same size as a frame of 35mm film).
35mm胶片尺寸为36毫米*24毫米（3：2的比率）-建议在你的照片中于黄金分割率1.6：1的交点处布局重要的要素。
35 mm film has the dimensions 36 mm by 24 mm (3:2 ratio) - golden mean ration of 1.6 to 1 Points of intersection are recommended as places to position important elements in your picture.
尺寸稳定性：纸张，胶片或菲林在水份含量和机械应力的变化下所能保持原来形状的能力。
Dimensional stability: Ability of paper or film toretaInits shape despite variations In relative humidity or mechanical stress.
尺寸稳定性：纸张，胶片或菲林在水份含量和机械应力的变化下所能保持原来形状的能力。
Dimensional stability: Ability of paper or film toretaInits shape despite variations In relative humidity or mechanical stress.
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