國際鳥類典藏 (IBC, Internet Bird Collection) 探索收藏
ML201668271 IBC 1186888
- 年齡
- 未確定
- 性別
- 未確定
影音備註
possible immature male stretching wings among corn stalks. Snow started falling while video-ing this owl. Several birders were watching him or her from busy State Route 72, 3 miles west of Shannon. The bird was 440 feet away, hence this footage is cropped by half vertically and horizontally. The distance was estimated from the size of the bird (2 ft), the 18% of the 3.92 mm-wide CMOS receptor (how much the bird covered the frame), and the maximum focal length of the camera (78mm) x 2 (tele-extender attached). Let me know if my calculation is flawed. Elevation: 291 m. Date added to IBC: June 23, 2016.
蒐藏
國際鳥類典藏 (IBC, Internet Bird Collection)
技術資訊
- 相機
- 麥克風
- 配件
- 原始檔案大小
- 27.95 MB