Geekoto GT200 Monolight Full Kit - Manual (Page 9)

Flash Output Range
The following table makes it easier to see how the f/stop changes when you
increase or decrease the flash output. For example, when you decrease the
flash output to 1/2, 1/2-0.3, or 1/2-0.7, and then increase the flash output to
more than 1/2, 1/2+0.3, 1/2+0.7, and 1/1 will be displayed.
Figures displayed when reducing the flash output level →
← Figures displayed when increasing the flash output level
1 / 4 1 / 2 1 / 1
1 / 1 – 0 . 3
1 / 2 + 0 . 7
1 / 1 - 0 . 7
1 / 2 + 0 . 3
1 / 2 - 0 . 3
1 / 4 + 0 . 7
1 / 2 - 0 . 7
1 / 4 + 0 . 3
······
······
S1/S2 Flash Mode
Optic S1 Secondary Unit Setting
Press > to choose S1
function so that this flash can function
as an optic Slave flash. With this
function, the flash will synchronize
with the main flash, the same effect
as that by the use of radio triggers.
This helps create a multiple lighting
effects.
Optic S2 Secondary Unit Setting
Press > to choose S2
function, so that this flash can also
a optic slave flash in M manual flash
mode. This is useful when cameras
have pre-flash function. With this
function, the flash will ignore a single
“pre-flash” from the main flash and
will only fire in response to the second,
actual flash from the main unit.
Multi Strobe Flash
- 13 - - 14 -
With strobe flash, a rapid series of flashes is fired. It can be used to capture
multiple images of a moving subject in a single photograph. You can set the
firing frequency (number of flashes per sec. expressed as Hz), the number
of flashes, and the flash output.
Press > button, until will display on the AV panel.
Setting the Number of Flashes and Flash Frequency
Press button to choose flash frequency and press <+> <-> to set the
number.
Press button to choose flashes, and press <+> <-> to set the number.
Calculating the Shutter Speed
During the strobe flash, the shutter remains open until the firing stops.
Use the formula below to calculate the shutter speed and set it with the
camera.
Number of Flashes / Flash Frequency = Shutter Speed
For example, if the number of flashes is 10 and the firing frequency is 5 Hz,
the shutter speed should be at least 2 seconds.
To avoid overheating and deteriorating the flash head, do not use stroboscopic
flash more than 10 times in succession. After 10 times, allow the camera flash to
rest for at least 15 minutes. If you try to use the stroboscopic flash more than 10
times in succession, the firing might stop automatically to protect the flash head.
If this happens, allow at least 15 minutes' rest for the camera flash.