To blacken the background, use a very small aperture. To get that spotlight effect, use a gizmo (not sure what the official word is for this) that will direct you light to a particular spot or area.
I my test here, I shot with a flash with the camera set to Manual mode, aperture f/22 and shutter speed 1/250. To direct the light to a certain area of the subject's face, I used a rolled up newspaper over the flash.
Here's the result. The placement of the lighting isn't all that great but what I was after was the result. This was just a less-than-five-minutes setup.
No photoshopping was required to get this effect. The background was blacked by the use of a very small aperture and a high shutter speed.
The second shot is what I got without the rolled up newpaper over the flash. A shot of the actual setup I used will be shown in the next post.
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