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142911 2010 年 12 月 02 日 20:01 Reading (loading. ..) Comments (0) Category: Personal Diary
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1 / 3 CCD focal length from the point of comparison table is for reference only
2.8mm / 6 meters angle: 115
3.6mm/10 m angle: 78
4mm/10--15 m angle: 75
6mm/15--20 m angle: 53
8mm/20--30 m angle: 40
12mm/25--30 m angle: 25
16mm/35--40 m angle: 20
25mm/60--80 m angle: 15
can be seen from the above data, the greater the number mm lens to shoot farther away,
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not have to illuminate much,
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