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Most data sheets for flash units lists the guide number (GN) for the flash at full power (1/1) for ISO 100 for meters and feet. This calculator let you compute the GN for other varipower settings and other ISO values. Enter the Guide Number (GN), in feet or meters, for firing the
28 Feb 2011 There are some DSLRs that are able to utilize the camera's built-in pop-up flash to control other remote flashes such as the Nikon D700 and the Canon EOS 7D. This can be beneficial if you already own a hot shoe flash because you can now move it off-camera and still control it. Check your camera's specs
Tell the 580EX your camera's ISO and aperture (F/stop) settings and it will calculate its own flash output. The built-in meter measures reflected light and turns off the flash when the proper amount is detected. To use the Auto External ("E") mode, a compatible body must be used - the Canon EOS-1D Mark III Digital SLR is the
The flash guide number is an important indicator of the power of an electronic flash for a digital SLR camera.
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oregoncoastphotoclub.tripod.com/calcs/flash.htm. I'm sure that if you Google 'flash guide number calulator' you will come across lots of hits. But it isn't a difficult calculation, just divide the GN by the aperture and you have the distance at ISO 100. Doubling the ISO multiplies the distance by v2 (close
In high-speed sync the guide number drops to under 30, even at 1/125s (which is slower than the sync speed). By the time you get to 1/8000s the guide number has drooped to 3.7 (m @ ISO 100). In case you're not familiar with guide numbers, the reach of the flash (maximum subject distance for full illumination) is given by
23 Feb 2011 A lot of beginners with little or no understanding about how TTL flash works usually get disappointing results with flash shots. a TTL flash will fire a pre-flash before the actual shot, the camera will then measure the pre-flash with the ambient light level to calculate the power needed in the actual flash for
The flash power calculator makes it easy for you to implement the equations to work out either your aperture or range. The equation can also be rearranged to calculate the guide number of a flashgun but since you can tell the Guide Number of a Canon Speedlite by its model name (580EX II = GN 58, 430EX II = GN 43) this
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