What is Speedlight Guide number?
What is Speedlight Guide number?
The flash guide number (GN) is a measure of the distance at which the flash can illuminate a subject. The higher the guide number, the greater the distance at which the light from the flash is sufficient for optimal exposure.
How does flash compare guide numbers?
Compare Power Levels of two flashes The simple rule is: Guide Number = distance x fstop Number (for any proper direct flash exposure). Therefore, double GN is double distance or double fstop Number (which is 2 EV stops of exposure). So comparing as f/stops works too.
What is the guide number of 600 RT Speedlite?
60
With a guide number of 60 (ISO 100, m), the Speedlite 600EX-RT is powerful enough to light up large areas, even when light is bounced off walls and ceilings.
How do I read a flash guide number?
For any given “correct flash exposure” situation, guide number is simply numerically equal to the aperture number (like the number 8 in f/8) multiplied by the subject distance (like 10 feet). Then for example, the guide number is f/8 x 10 feet = GN 80 (feet units).
How do flash guide numbers work?
Guide numbers are based on a simple mathematical equation that states: the light output of an electronic flash is equal to the distance of the flash unit from the subject multiplied by the lens aperture, or f/stop.
What does 1 128 on a flash mean?
Flash units allow you to reduce the flash output, from 1/1 to 1/2 (half-power) to 1/4 (quarter-power) to 1/8 and so on, down to 1/128 typically. Reducing the flash output by one stop (from 1/1 to 1/2) would be the same as reducing the aperture one stop to f/16 (from f/11 to f/16). So let’s plug that into our formula.
How do you use a 600EX-RT?
If you’re using two 600EX-RT flashes, you just press the Wireless button on the unit to be used as Master, until you get the antenna for radio and “master” shows on the LCD. Then do the same on the slave unit (keep pressing the Wireless button), until you get the antenna and the word “slave.”
Is there a warranty on the Canon Speedlite 580EX?
This warranty is given by Canon U.S.A., Inc., with respect to equipment purchased in the United States. Canon offers a wide range of compatible supplies and accessories that can enhance your user experience with you Speedlite 580EX that you can purchase direct.
What does the select dial on Canon SLR do?
A new Select Dial makes changes, like exposure compensation, a breeze. It now covers lenses as wide as 14mm, and has new features for digital SLRs – including the ability to transmit precise flash color temperature information, and vary the zoom setting to match the imaging sensor.
Are there any guarantees in the canon software?
CANON U.S.A.,Inc. MAKES NO GUARANTEES OF ANY KIND WITH REGARD TO ANY PROGRAMS, FILES, DRIVERS OR ANY OTHER MATERIALS CONTAINED ON OR DOWNLOADED FROM THIS, OR ANY OTHER, CANON SOFTWARE SITE. ALL SUCH PROGRAMS, FILES, DRIVERS AND OTHER MATERIALS ARE SUPPLIED “AS IS.”
