Geekoto C1 Technical manual

C1 (Commander) Flash Trigger
Operation instruction
Fit for Nikon

Catalog
Safety instructions
Function List
Components
Component instruction
Preparation before use
Functions description
Custom function/FN
Wireless channel setting
Assisted focusing light
Hot Shoe
Nikon master control mixed mode
Nikon master control Multi mode
Specification List
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06
08
10
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1.Please turn off all devices while you connecting
them to each other.
2.Please prevent dropping hand shaking intensively
of the device, it might cause damage to the device.
3.Please turn off transmitter and receiver’s power,
remove the battery when you don’t in use or storing.
4.Please load the battery properly. Reversed battery
might cause battery leaking or explosion
5.Do not put it in a high temperature environment,
such as near the car, direct sunlight, dashboard
and other high temperature environment.
6.Please keep it dry. Do not use wet hands to touch
products. Products may not be immersed in water
or rain, or may cause damage or broken.
7.Do not use it in flammable and explosive situations,
it might cause explosion or fire.
8.The product involves batteries. Regarding the use
of batteries, please follow strict relevant regulations,
otherwise it will cause property damage or personal
injury.
Safety instructions Function List
Please read this manual carefully before use. 1.Available flash mode: I-TTL, M, Multi.
2.Available for Front curtain sync/back curtain sync/
high-speed sync, highest sync speed 1/8000s.
3.Exposure compensation available. (FEC)
4.Surround expose available. (FEB) 5.Exposure
Lock available. (FE LOCK)
6.Available for focusing assist lamp.(can be disabled)
7.Available for mixed flash mode, such TTL, M.
8.Available for setting auto save function.
9.Available for 4 groups with different power output
for each flash.
10.Can be controlled by multiple receivers.
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Components
Rubber cap
Micro USB
Group B
Group A/ Custom function setting
Mode
Test
Indicate light
LCD Screen
Group C
Group D/Channel setting
Power switch: ON/OFF
Setting/restore factory setting
Setting (up/down/
left/right)
Battery door
Twist lock
Mounting holder
Components

Component instruction
Power Switch:
Slide to 【ON】 to power on.
Slide to 【OFF】 to power off
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Automatic focusing assist
High-speed sync
Manual /strobe flash mode
Wireless channel
Flash setting for A
Flash setting for B
Flash setting for C
Flash setting for D
Focal Distance
Aperture
Strobe flash
Times
Components
LCD Screen

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Hot Shoe contacts: Use it to connect with camera,
compatible with Nikon.
Mode: Transmitter mode option
Test: Send flash signal for groups
A:B:C:D Enter/exit flash setting for groups
Indicate light: Power wireless communication or
command indicate
Micro USB: System update
Battery bin: 2 AA batteries
Preparation before use
Battery loading
Open the battery hatch. Install two AA batteries according
to the positive and negative directions of the battery,
when installation completed, close the battery hatch.
Component instruction
Standby - red light flashing
Camera connected - Green light flashing
Test - Both green light & red light always on
Indicate light status
Please remove the batteries before long term storage.
When replacing batteries, please replace the two
sections together.

Power on
Load batteries correctly, push the switch to 【ON】to
turn on the trigger, then LCD screen & 2 color lights
are on simultaneously, system check and complete
initialization, enter standby mode, red indicator flashing.
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Install the trigger on the hot shoe contact
from top of camera.
1. Unlock the twist lock by sliding to the left.
2. Insert holder completely into camera hot shoe,
and push it all the way in contacts.
3. Slide the twist lock to the right to lock it, and make
sure it sits securely on the hot shoe.
Preparation before use Functions description
Test
Press【TEST】,trigger send group mode and settings
info to flash lights which in the same channel and flash
once to test the transmission.
LCD
Press any button to light LCD, after 10 seconds no operate,
LCD light turns off.
Restore Factory settings
Press [ok] for 3 seconds, the trigger will restore to factory
settings.
Mode options
Turn on the trigger, press 【Mode】, now trigger enter
into mode options, after turning on the transmitter, you
can cycle through mix mode and the multi mode.

Custom function
serial number
Functions
Status setting
Automatical
focusing assist
Wireless channel setting
Press 【D】button about 2 seconds, wireless channel
light flickers and enters wireless channel setting,
press 【←】/【→】to set channel from 1 to 16.
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Custom function/FN
Press 【FN】for 2 seconds, system will change
between customized settings and flash modes, enter
custom mode, press 【←】/【→】to set option
number.
Instruction

Assisted focusing light
If you enabled “automatic focusing”on transmitter,
When the light is not enough to focus automatically,
it will enable the assist focusing light in trigger to help
to make focusing easier.
To use focusing light correctly, you need to set a
camera in automatic mode, turn on the camera lens’
autofocus function. Turn on “AF” transmitter and
customize (C.Fn3) function.
Hot Shoe
Connecting trigger with Nikon Cameras, Press the
shutter lightly, trigger will identifies the camera
automatically, and send the trigger setting status to
flash to I-TTL offline flash, the highest sync speed is
1/8000s.
Connecting trigger with other cameras (besides Nikon),
available for sync trigger, The highest sync speed is
1/250s or lower.
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Nikon master control mixed mode
Setting for groups
① Press【MODE】button to select transmitter mode
as Nikon master control Mixed mode (as pic showed)
② Press【A】/【B】/【C】【D】for a few seconds
to select or exit f lash grouping setting, the arrow
refersto the group you’re setting.
/
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Automatic Focus Assist
High-speed sync
Wireless Channel
Group A Flash settings
Group B Flash settings
Group D Flash settings
Focal distance
Aperture
Group C Flash settings
Nikon master control mixed mode
③ After selected a group, press 【MODE】button to
set the flash mode of the group,every modes
parameters are as below:
TTL : Compatible with i- TTL , Exposure
compensation adjustment available from -3.0EV to
+3.0EV, total 22 levels; press【↑】/【↓】
button to change Focal distance for different groups.
M: Flash output range 1/128~1, press【←】/
【→】to increase or decrease 0. 3EV, ( Adjustment
available for total 22 levels), press【↑】/【↓】
button to change Focal distance for different groups.
OFF: The group does not involve flash.
④ After you finished the flash parameters for the
groups, press A/B/C/D button again to exit setting
and sent the flash info to the others flash light which
in the different groups but the same Channel.
※ Under this mode, it’s available for 4 flash lights
engage exposure with different mode and different
power.

Nikon master control Multi mode
Setting for groups
① Press【MODE】button to select transmitter mode
as pic showed . Under this mode, the settings of
all groups are the same.
② Under non-grouping setting status, press【←】/
【→】button to set flash power, flash output is
adjustable from 1/4 to 1/128, total 6 levels.
④ Under Frequency setting, press【OK】button to
exit, after screen flash flickered a few times, press
【←】/【→】 button to adjust numbers of time,
flash times are available from 1-40.
③ Under standby status, press 【OK】button, you can
see the Frequency numbers are flickering, press
【←】/【→】button to adjust frequency, available
frequency from 1HZ-100HZ.
1-8
1/16
1-12
1/32
1-20
1/64
1-40
1/128
Group A Flash power & Flash frequency connection table
Flash power
Flash frequency 1-4
1/8
1-2
1/4
Nikon master control Multi mode
⑤ After finished flash parameters, Press【A】/【B】/
【C】/【D】button for a few seconds to select or exit
flash grouping setting, the arrow refers to the group
you’re setting.
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Automatic focusing assis
Master Control Multi mode
Wireless Channels
Group A Switch
Group B Switch
Group C Switch
Group D Flash settings
Focal distance
Aperture
Flash output power
Flash frequency
Flash times

Nikon master control Multi mode
⑥ After you select the setting groups, press【MODE】
button to turn on/off the groups you selected, you can
also press 【← 】/【→ 】to turn on/off it, press
【↑】/【↓】button to change Focal distance for
different groups.
⑦ After you finished the flash settings for the groups,
press A/ B/ C/ D button again to exit setting and sent
the flash info to the others flash light which in the
different groups but the same Channel.
Specification List
System mode: Digital FSK 2.4G HZ Wireless Trigger
Communication Distance: 50 meter
Wireless Channel: 16
Flash mode: I-TTL, M, Multi.
Synchronous mode: Front synchronize,
Back synchronize, High Speed synchronize.
Group control: A\B\C\D 4 groups (Each group can be
set separately, flash ratio also can be set.
Function: FE lock and FP
Synchronous speed: 1/8000s
Compatible Flashlight: Studio flashlight, Photo flash,
G Series.
Focusing light: Assist focusing light
Input: Available for Hot Shoe
(TTL Triggered or single contact triggered) Suitable
Battery: 2 AA Battery (rechargeable battery accepted)
Standby time: 60 hours
( AA 1.2v 2400mh rechargeable batteries)
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