用小光圈，仔细调整相机位置。
闪光曝光，可用小光圈档，用一张白纸放在原稿上面或用闪光灯曝光。
This exposure is made with a small F-stop to a sheet of white paper placed over the original, or to the rays from a flash - lamp.
通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。
Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.
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