Lens Ettl
Photography : More About In-Camera Flashes
The most basic flash units are for ideal for casual photographing of family etc… or if you are out shooting still life on a dull day and need that extra bit of fill light, it would be a perfect solution. The basic flash units are also beneficial for their size; smaller sizes mean less weight and easier to transport, perfect for the smaller more compact SLR’s and point and shoots which have a hotshoe (the connection plate on the camera to mount the flash).
Even these flash units can have a flash output twice or three times greater than that of the built in flash.
Moving on from the basic models, the mid range and professional models are supplied with a much greater array of functions, settings and controls leaving the photographer with a much greater scope on power output, manual and ETTL settings, as well as custom settings, exposure compensation, etc… of course with these extra functions comes a cost. They can be quite expensive but are well worth the money utilised correctly.
The advanced flash units also have a slave function, which allows you to use them as secondary flash units. Slave units are triggered by the primary flash unit, which is mounted on your camera. It is a very useful function, which allows you to have greater input on the lighting, and it aids in the reduction of unsightly background shadows, which may occur. There is another useful function called curtain sync which allows you (when shooting long exposures) to have a light trail following a moving subject. The curtain sync is the flash firing just before the shutter closes.
Another use for the curtain sync mode is shooting portraits indoors where you would like to include the background in your shot. By using the curtain sync mode, the shutter remains open long enough to allow ambient light from your background into your camera, then the flash fires before the shutter closes thereby “freezing” your main subject.
Another useful addition to the flash units is the AF-assist beam, which are used for low light conditions where autofocus may otherwise be difficult. Some flash units come with a pull out Fresnel lens to allow for the use of wide-angle lenses. The higher end flash units are also manufactured with a small white reflector to get the most out of using a bounced flash (flash reflected off the white reflector and “bounced” onto your subject, rather than firing the flash directly towards your subject).
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