You can't use conventional units with pocket cameras or instant cameras. These are not suitable for the high precision equipment. They are also not designed to have added external units connected to them. Hence camera flash units are best paired with digital cameras or standalone cameras.
In the event the hot shoe mounted flash is not sufficient, the hammerhead type of camera flash is used. This provides better illumination and better angle adaptability too in many cases. Camera flash units are mounted on digital cameras that don't come with independent or in-built flash units.
These units are fairly effective for lighting a large area whether indoors or outdoors. It's best to use this when you're taking pictures indoors because the lack of lighting can make your pictures appear dim and lose focus. There's also the possibility of not capturing the mood and effect of a picture if you don't use the flash effectively.
Just switch on your flash when outside and allow the camera to do the rest. The first time you use it you will be amazed at how it improves your images dramatically. Never again will you have those dark shadows across your subjects.
This is the only way to shoot great flash images if you aren't using a diffuser or bouncing the flash. An off camera cable is reasonably priced and really helps improve your images. By mounting your flash in the cable hotshoe and holding it slightly off to the left or right of your camera it helps prevent the harsh lighting of on camera flash. You can mount it on a tripod next to the camera or buy a mounting bracket that fits underneath your camera and mounts the flash off the camera.
You can start by popping your built-in-flash and start firing, making sure that your shutter speed is slower than your Flash Sync Speed. Your camera flash meter will balance the exposure for you, so that you can concentrate on your subject and composition.
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