Solargraphy丨日迹照相术教学
这张图可能是目前最长的摄影曝光，它记录了太阳 8 年间在天空的轨迹图，由啤酒罐制成的针孔相机拍摄完成。
https://www.instructables.com/Solargraphy/
这篇文章提供了 Solargraphy 详尽和清楚的教学步骤，主要操作是通过在铝罐里放入相纸胶片并朝向中间打的针孔，固定位置进行长期曝光捕获，待太阳图像「烧」在纸上后，扫描成像。
工具使用也非常简单和低成本：铝罐、开罐器、剪刀、缝衣针、电工胶带和放大纸（Enlargement Paper）。不过回收率低，可以多做点多玩玩。
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