Wait what? If your shooting at night, or in a dimly lit room, this is an excellent technique. Set your camera to manual mode, or on a film range finder just set the following settings.
- Aperture Should be set to smallest setting (Highest F/Stop I.E. F/16)
- Shutter speed should be adjusted to the point where the meter registers +1/3 generally around 30seconds to 1 minute. On a manual film rangefinder set the camera to bulb, and hold it open for a count. If you have a shutter release this may help as well.
- Do it again. Not every shot is going to be blurred as much as you want it to be. Keep trying. You might try opening up an old cheap rangefinder like a Argus C3 and creating a pinhole camera, out of it, dragging exposure times from 60seconds to several minutes.
There are tons of things to try just go try.