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Examples
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1. Camera format, inch: 1/2
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2. Lens format, inch: 1/2
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3. Angle of view (vertical), degree: 30
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4. خت
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Lens focal length, mm: 9.0
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1. Camera format, inch: 1/3
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2. Lens format, inch: 1/2
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3. Angle of view (vertical), degree: 15
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4. خت
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Lens focal length, mm: 13.7
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