WebMar 17, 2015 · For the purest who prefers taking control of their flash, the Guide Number Calculator is a tool for determining subject aperture and distance when using your flash … WebNov 11, 2006 · Using the guide numbers for FP Flash and 105mm zoom (right side of the lower chart) 1/250 and f/10 gives you 2.5 meters (25.0/10) 1/1000 and f/5 gives you 2.5 meters (12.5/5) ... Actually, it is fairly eay to calculate the general rule of the max. distance difference between FP and regular flash. This difference is dependent on the camera's ...
Understanding Camera Flash Guide Numbers, Part 2
WebGuide Number (GN) is a numerical method used to determine exposure of direct flash for Manual flash power levels, to automatically deal with the Inverse Square Law, making … WebFor the purest who prefers taking control of their flash, the Guide Number Calculator is a tool for determining subject aperture and distance when using your flash unit manually. … dr glenn mcdonald restoration men\u0027s health
Understanding Flash
WebFlash Guide Number Formula There's a mathematical formula for calculating flash guide numbers: Guide Number = [Flash to Subject Distance] x [F-Stop] Before we dig into … WebMay 9, 2024 · To use a flash guide number to calculate your flash exposure all you do is solve for the variables in the formula: Flash guide number = Subject Distance from Flash Source x f/Stop There are some great tutorials online if you would like to research this further but, at least for my pea brain, this all I have to say about guide numbers. WebF-stop is determined by dividing the distance from your lens to the subject into the guide number. f stop = Guide number distance For example using ISO 100 color film and blue AG1 flashbulbs with a shutter speed of 1/25 sec and a subject distance of 10 ft. gn = 140 distance = 10ft. 140 10 = F14 dr glenn orthopedic institute lake city fl