Very often when people see such photos, the first thing what they think about is that it has been done via Photoshop. Let’s prove that these photos can be easily made by your own hands, I mean by your cameras. :)
We should choose a place with not very bright illumination. We should set the camera at the tripod. Then we should set the camera at the mode of diaphragm priority and set the biggest diaphragm value. Correspondingly optical exposure would increase. And that’s what we need! Now we should focus our object which would contain the “ghost”. We should set the camera at the mode of autorelease and quickly place another object near our “ghost”.
After the fixed time we should quickly replace our second object from the picture. In a few minutes the shutter would be closed.
Time of “ghost” exposing varies depending on how vivid you want to make it. The less the object is on camera, the more transparent it would be.