Originally posted by Sasquatch My two bodies are: K1000 SE and a Ricoh KR-5 SuperII.
The K1000 has a sync speed of 1/60, and the Ricoh is 1/125.
I think I'm understanding more now... but how about a scenario question:
I shot a roll in a pretty dark room at a subject about 3 feet away. I had the Ricoh's shutter speed at 1/125, the lens aperture at 5.6 per the flash's recomendation, and the flash was on auto mode. I was shooting 200 speed film. All of the pictures turned out, but they weren't anything special or interesting.
Let's say I'm in the exact same scenario... but I slow down the shutter significantly, say to 1/4. What changes can I expect? Will the picture be drastically lighter? Blown out? Or will the foreground look more-or-less the same, and the background will have more ambient light?
I'm also very interested in party/bar/nightclub photography and shooting live bands. These are some of the things that have sparked these questions. I've watched Codiac(chris)'s tutorials on the subject and it's helped a bit with ideas. Still a lot of flash ponderings to be done on my part though.
Shooting at a speed slower than the maximum sync speed of you camera is known as "dragging the shutter". It is a perfectly valid and useful technique. It is normally used when you wish to stop the action or fully light an object in the foreground, but not lose detail in the background.
By shooting with a slower shutter speed, more of the background will be visible, due to the ambient light. The person or object in the foreground will be exposed by the flash. As others have said, the shutter speed has little effect on the flash exposure, since electronic flashes typically have a shutter speed of 1/1000 second or faster. Automatic or TTL flashes vary the flash duration to as little as 1/50,000 second for closer objects.
Of course, this technique, like any other can be misused, overused or used in an inappropriate manner.
If there is enough ambient light to expose the foreground object, and it is moving, you may see a "ghost" image of the object. The slower shutter speed lets the moving object appear on the film and the flash then freezes it. With most film cameras, the flash is synched at the instant that the shutter is fully open. Since the shutter is fully open for 1/60 second or more, while the flash is only on for 1/1000 or less, there is plenty of time for the subject to move, resulting in a blurred ghost image after the flash.
On a few film cameras (definitely NOT the K-1000) and many dslrs, there is an option to synch the flash to the trailing shutter. That is, the flash will fire an instant before the shutter begins to close. This means that the ghost image will lead into the flash-frozen image.
I believe that, if the proper ambient light exposure is within two stops of the flash exposure, you run the risk of ghosting. That is, if you're shooting with flash at 1/125 @ f/5.6, but your light meter says that ambient light will be exposed with 1/30 @ f/5.6, then you may see the ghost. If ambient light requires 1/8 or 1/4 at f/5.6, you probably will not see the ghost.