Flash range
An electronic flash has a maximum distance that it is capable of illuminating. There's also usually a close point where it will start to become too bright and overexpose the subject.
Flash Range
From Nikonians Wiki - FAQs, Photo Glossary, Good Photo Locations, Help
Jump to: navigation, search ...
Flash range
Techniques Glossary Flash range
An electronic flash has a maximum distance that it is capable of illuminating. There's also usually a close point where it will start to become too bright and overexpose the subject.
Flash range
The distance over which a flash unit can give adequate illumination.
FLASH RANGE- The effective distance the strobe light can illuminate the subject. Most digital cameras that have built-in strobe lights are effective to about 12 to 15 feet. It varies by brand so check the specifications carefully.
Flash range
The distance needed to be covered by the flash to give the subject optimal illumination. This can be calculated using Lambert's law.
Flash range is more complicated than it may initally sound. There is a distance associated with your flash's range, your flash can only work effectively within that distance. But, there is also an angle that your flash can reach.
Flash range at different sensitivities (from the DiMAGE S304 manual):
Sensitivity
Flash range (wide angle) ...
At ISO 400, flash range with the EF-S 18-55 kit lens is up to 24ft at 18mm (f3.5)and up to 15ft at 55mm (f5.6). A red-eye reduction lamp can be enabled via the menu system. Maximum flash sync speed is 1/200s.
Memory Cards ...
External flashes are used for many things including increased flash range and red-eye reduction.
Film: A photographic emulsion of an image that is fixed on a flexible, transparent base.
Typical flash range is up to fifteen feet for film cameras and six to ten feet for digital cameras. Subjects that are outside this flash range will be either too dark or too light. Using a higher-speed film may extend your flash by a few feet.
Do not be outside your "flash range." For example, if at ISO 100, your flash can properly illuminate 12 feet, don't attempt any photography pose that requires anyone to stand at 14 feet (unless, of course, ...
This will extend your flash range to 12 feet or more.
3) Use the "night time flash" mode. This only works for still subjects though, not action shots.
Obviously no rule was broken in the tests, that is, shooting outside of the flash range dictated by the Guide Number (GN). If you don't break it, your images should always look well lit. If they don't, ask your photo lab to redo your prints.
To calculate the maximum flash range, divide the guide number by the f/stop you plan on using.
Using a 400 ISO equivalent as opposed to 100 may be helpful for getting sharper pictures or extending flash range. Be aware that a high film speed equivalent setting on digital cameras can result in more "noise" in the image.
This also explains why you don't necessarily gain much more flash range when you buy a moderately more powerful flash unit, and why foreground objects are much more brightly illuminated by your camera-mounted flash unit than distant objects.
Because this article is aimed at those with a middling or better knowledge of photography, we're not going to explain concepts like aperture or shutter speeds, film speed or flash range-stuff you should know already.
At lower speeds, even shooting a subject a few feet away yielded unacceptably dark results with worse results when shooting in the telephoto range. Shooting at ISO 400 or higher helped increase the flash range, but this also increased grain.
The optical quality is not the best. Most of the cameras have fixed focal length. Also worth knowing is the limited flash range in these cameras. There are no possibilities of connecting external flash.
However, they are generally limited to one or two basic shutter speeds and can just be used outdoors in good weather or indoors with the flash within a rather limited flash range of usually 4 to 10 feet.
 See also: Flash, Camera, Light, Photograph, Digital
|
