![]() ![]() You've got the ISO at 200 and your flash is the one noted above with a GN of 160 for ISO 100. All she had to do was pull the string from the stand to her subjects face and count the knots. Then to help her manage exposure he tied a string to the light stand and put knots in the string for each full f/stop. She was going to try her first outdoor fill-flash shoot and he kindly lent her one of his portable strobes, battery and stand. I had a student a couple years ago who managed to get and internship with a local Pro portrait photographer. The guide number divided by distance = f/stop. ![]() That's all you'd need to know along with the distance from the flash to the subject. Let's say you flash has a guide number of 160 for ISO 100. Tirediron is correct you want a guide number for your flash. ![]() Proper flash exposure is a function of flash power and flash to subject distance (for a given ISO). The question is this - Assuming we do not have a light meter, how do you know based on the fire power of the speedlight where you are in terms of STOPS below the ambient exposure? Stated another way, is there a "standard" way of determining what fire power is a stop below the ambient exposure? For example, if you have determined that the proper exposure based on ambient light is f/4, ISO 100, and you need the fill light 2 stops BELOW that, where do you start in terms of power settings to get 2 or 3 stops below? Is it trial and error? Do you try 1/16 and look at the LCD screen and make adjustments from there? Is there a more simple way?ĭoes anybody even know what I'm talking about? If you have the book, turn to page 48 and look under the left column entitled "Two Broad Scenarios" "If we Just Need Fill Flash" and you will see his discussion. If you are familiar with using manual flash, you know that you can set the flash fire power at 1/1, 1/2, 1/4.1/64 down to 1/128. So, let's say you have metered for the ambient light and you wish to use manual flash for fill light. In this case, he suggests metering the flash 2 to 3 stops under the ambient light to use the flash for fill. One such approach is if you already have the correct exposure for the ambient light and just need fill flash for the subject. Neil van Niekerk says in his book, Off Camera Flash, that when balancing ambient light with manual flash there are several approaches that can be used. ![]()
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