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几亩瓜 · 发表于 2011-8-23 21:33:33

DIY a Barn-Door Tracker

几亩瓜 · 发表于 2011-8-23 21:40:33

The Big Dipper was shot with a Canon 1000D (Digital Rebel XS) and an 18-55mm zoom lens at 20mm of focal length with a 2-minute exposure at ISO 1600 at f/3.5 on this barn-door tracker, driven by hand. Clouds obscure stars in the upper right corner of the frame.

几亩瓜 · 发表于 2011-8-23 23:32:32

几亩瓜 · 发表于 2011-9-10 12:01:51

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