Experience of taking pictures with pinhole camera

Your main problem is serious underexposure. You know, the aperture of pinhole camera is very small. I also made a simple pinhole camera out of a biscuit box. See/blog/user1/sxzjd/1561.shtml for details.

In June 65438+1October 65438+July 2006, an article in China Photography introduced a self-made pinhole camera. You can refer to it Here I briefly introduce: pinhole is not as small as possible, generally 0.3-0.6mm is appropriate, pinhole can be pricked with steel needle and polished with fine sandpaper. Usually, the focal length of 50mm is 0.3mm and 20 mm, and the aperture value is calculated by dividing the focal length by the pinhole diameter. If the focal length (that is, the vertical distance from the pinhole to the substrate) is 100mm and the pinhole is 0.5mm, the aperture is f/200. If 3 # magnifying paper is used as the negative film (equivalent to ISO25), the aperture exposure time of f/200 is 25 seconds according to the exposure meter in fine weather, and the actual exposure time is 50 seconds considering the failure of reciprocity rate.

The exposure time of pinhole camera is a key issue, which needs to be determined according to your camera situation and lighting conditions. Moreover, the darker the light, the more exposure time is needed, sometimes even several hours, which requires more practice to master.