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photowiki:focallength [2017/02/04 11:54]
ying [Magnification Ratio]
photowiki:focallength [2017/02/04 21:06] (current)
shining ↷ Links adapted because of a move operation
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   * **So, to Edge-Touch the Moon, you need at least 2400mm equiv. focal length (about 0.5 degree).**   * **So, to Edge-Touch the Moon, you need at least 2400mm equiv. focal length (about 0.5 degree).**
  
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 **The system of angular measurement used by astronomers is based on divisions of the circle. The circle is divided into 360 degrees. Degrees are divided into 60 minutes of arc, or arc minutes, and each minute is divided into 60 arc seconds. **The system of angular measurement used by astronomers is based on divisions of the circle. The circle is divided into 360 degrees. Degrees are divided into 60 minutes of arc, or arc minutes, and each minute is divided into 60 arc seconds.