116RECORDING —using the flash (Cont.)m Usable commercially available external flashesWhen selecting an extension flash, use products which meet thefollowing basic conditions.(1) Exposures when using an extension flash require that adjustments bemade on the extension flash unit.If an extension flash is used in the Auto mode, match it with the F valueand ISO sensitivity settings on the camera.(2) Even if the auto F value and ISO sensitivity of the extension flash are setto the same conditions as those on the camera, depending on thephotographic conditions, it is possible that the correct exposure may notbe obtained anyway. In such a case, adjust the auto F value or ISO valueon extension flash unit or calculate the distance in the manual mode anduse it that way. However, generally, the auto F value and ISO value canonly be adjusted 1 step and beyond that, exposure compensation cannotbe made. (Exposure compensation in the camera is made invalid inextension flash photography.)(3) Use a flash which is capable of covering an illumination angle for a 38 mmor larger lens when calculated for 35 mm film. However, in close-upphotography with the lens on the wide setting, the bottom of the imagemay not expose correctly. The ideal is to have a wide angle adapter to fiton the flash and spread the illumination angle so it is wider.(4) Use a flash unit with a flash time of 1/200 sec. or less when using the flashat full strength. For devices with a long flash time, such as a ring flash, aportion of the light emitted will not contribute to the exposure.(5) If a flash unit or other accessory with additional communications functionsother than the FL-40 is used, it may not only fail to function normally, butmay also cause damage to the camera’s circuitry. Do not use such adevice.
