Dragging the shutter

I've been trying to learn the theory about the technique known as 'dragging the shutter' (SLRs).

A method for improving ambient light in dark scenes, rather than dark background with flash lit foreground.

It seems I would need to under expose according to the cameras meter, possibly by as much as 2-stops then adding a touch of flash.

So, I guess meter the scene with flash off. Then use that meter reading but with a bit of flash?

That doesn't seem right to me as I'd expect to then get over exposed shots.

Can anyone explain this method nicely for me? Please.

Some nice examples on why I'd want to do this, confusing description (in my simple mind anyway!)...

http://planetneil.com/tangents/flash-photography-techniques/3-dragging-the-shutter/

AKA slow-sync-flash... now I have a better idea...

http://forums.photographyreview.com/showthread.php?t=16017

I didn't know that is what it is called, but I've been doing it regularly for a while, although I rarely take the shutter below 1/30.

Open the aperture right up and set the exposure a couple of stops darker than the cameras recommended reading, then enable the flash and drop the flash exposure control by a stop or two.

As usual, experiment!

On a different subject, I will be passing your house tomorrow at about 10 30. Could drop the barn door in if you are around.

Keith

Thanks Keith - assuming you mean AM I will be at work (in Leeds).

Ok, we''l sort out another time soon

Keith