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1 Feb 2010 P.S. Flashmatic cameras were ones where you dial the guide number into the camera and it would work out the correct aperture for you.14 Jan 2015 Flashmatic is essentially guide number automation, i.e. distance/aperture coupling, which will deliver the correct amount of light to whatever is Compact Manual Electronic Flash Unit with Hot Shoe (Guide Number 18m/58ft) for many mechanical Film Cameras, ideal for 35mm Flashmatic Compacts. While automatic exposure control is common on newer flash units many older and rangefinder cameras with flashmatic control (or SLR cameras with GN I can use the flash in manual mode under either 1/16th or full power, I presume I shall be using one of these when using the flashmatic mode. 5 Feb 2019 Mystified by talk of “guide number” and “flash power”? Gerald Undone made this helpful 10-minute video that explains everything you need to 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 Suppose a photographer wants to shoot with an aperture of f/2.8 and the guide number is 28 (m) / 92 (ft). The flash device must be 10 meters (33 feet) from the subject. Suppose a photographer's flash-to-subject distance is 9.75 meters (32 feet) and the guide number is 39 (m) / 128 (ft). The aperture must be f/4.