What is flash guide number mean?

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 do I find my 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 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 effective flash range?

Look for “Effective Flash Range” under the Flash section for the maximum effective distance (measured from the tip of lens) where you can still get an appropriate brightness (correct exposure) using the flash.

How do I choose flash settings?

Experiment and have fun with it.

1. Step 1: Put your Camera in Manual Mode.
2. Step 2: Set your Aperture to f8.
3. Step 3: Set your Shutter Speed to 1/200.
4. Step 4: Set your ISO to 200.
5. Step 5: Set your Flash Power to 1/16.
6. Step 6: Bounce Flash vs Off-Camera Flash.

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.

How is flash power measured?

Flash power is measured in watt-seconds, not watts. A watt-second is a watt of power sustained for 1 second. Or 2 watts for 1/2 second. Or 100 watts for 1/100 second.

What is the guide number for Godox V1?

92
The V1 has a 92′ Guide Number, versus 154′ for the similarly priced Canon Speedlite 470EX-AI.

How is flash distance calculated?

Distance formula divides the Guide number by the f/stop to calculate the flash range at ISO 100. Each time you double the ISO, the distance increasses by 1.44x.

What do you need to know about Q-Flash?

What is Q-Flash™. Q-Flash is a BIOS flash utility embedded in Flash ROM. With Q-Flash you can update the system BIOS without having to enter operating systems like MS-DOS or Windows first. (Not all motherboards support Q-Flash™, please use @BIOS™ or DOS flash utility to update BIOS if your motherboard does not have Q-Flash™.)

Where can I get BIOS update for Q Flash?

Before using Q-Flash utility, go to GIGABYTE website to download the latest compressed BIOS update file that matches your motherboard model. Extract the file and save the new BIOS file to your floppy disk, USB flash drive, or hard drive. And be noted that the USB flash drive or hard drive must use FAT32/16/12 file system.

What does the guide number on a flash mean?

It’s basically a distance-priority manual flash mode. Based on ISO and aperture values selected by the photographer, the flash controls the light output based on distance to the subject. In some ways, it’s a reverse guide number mode.

What can you do with Q-Flash ROM?

Q-Flash is a BIOS flash utility embedded in Flash ROM. With Q-Flash you can update the system BIOS without having to enter operating systems like MS-DOS or Windows first.