Olympus E-100 RS - Manual (Page 116)

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When selecting an extension flash, use products which meet the
following basic conditions.
(1) Exposures when using an extension flash require that adjustments be
made on the extension flash unit.
If an extension flash is used in the Auto mode, match it with the F value
and ISO sensitivity settings on the camera.
(2) Even if the auto F value and ISO sensitivity of the extension flash are set
to the same conditions as those on the camera, depending on the
photographic conditions, it is possible that the correct exposure may not
be obtained anyway. In such a case, adjust the auto F value or ISO value
on extension flash unit or calculate the distance in the manual mode and
use it that way. However, generally, the auto F value and ISO value can
only be adjusted 1 step and beyond that, exposure compensation cannot
be made. (Exposure compensation in the camera is made invalid in
extension flash photography.)
(3) Use a flash which is capable of covering an illumination angle for a 32 mm
or larger lens when calculated for 35 mm film. However, in close-up
photography with the lens on the wide setting, the bottom of the image
may not expose correctly. The ideal is to have a wide angle adapter to fit
on 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 flash
at full strength. For devices with a long flash time, such as a ring flash, a
portion of the light emitted will not contribute to the exposure.
(5) If a flash unit or other accessory with additional communications functions
other than the FL-40 is used, it may not only fail to function normally, but
may also cause damage to the camera’s circuitry. Do not use such a
device.
Shooting with an external flash (Cont.)
Usable commercially available external flashes