18) Normal Objective: The normal lens is one that has almost always 35 mm SLR camera SRL your purchase, its focal length is 50 mm, This type of lens, has a major advantage, a diaphragm with an opening capacity increased to more light, a zoom lens or a telephoto . It is advisable to use in low light. Its aperture ranges from 2.8 to 1.7 or 16 or 22. In it, is the focus ring, diaphragm, and a depth of field scale. Keep in mind that when it comes to this goal, we providing a vision similar to the human eye. Is used heavily in portrait photography as they do not distort the image in the foreground, and is one of the cheapest in the market objectives. 
Diaphragm: 3.5 Lighting: Light Tungteno
Speed \u200b\u200b30 Movie: CCD digital camera
Objective: Normal Format: Color
Diaphragm: 2.8 Lighting: Light
Against Speed \u200b\u200b15 Movie: 36 EPx Kodak ASA 100 .
If Measure 48 mm, the ratio of focal length of the fixed lens is between 40 and 60 mm lens or objectives are considered normal for the 35 mm format, that are close to that distance in millimeters to measuring the diagonal of the format used to doing. 
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