Geekoto C1 Technical manual

C1 (Commander) Flash Trigger
Operation instruction
Fit for Canon

Catalog
Safety instructions
Function List
Components
LCD screen
Component instruction
Preparation before use
Functions description
Custom function/FN
Sync mode setting
Wireless channel setting
Assisted focusing light
Hot Shoe
3 MODES
Canon universal mixed mode
Canon master control Multi mode
Compatible Devices
Specification List
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02
03
05
06
08
09
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13
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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: E-TTL, E-TTL(Ⅱ), 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 the different power
output for each flash.
10.Can be controlled by multiple receivers.
11.Available for M, Multi grouping setting.
( Canon series A camera wireless flash)
01 02

03 04
Components
Rubber cap
Micro USB
Group B
Group A/ Custom function setting
Mode
Test
Indicate light
LCD Screen
Group C/ Sync mode button
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
05 06
Automatic focusing assist
Back curtain sync
High-speed sync
Manual /strobe flash mode
Wireless channel
Flash setting for A
Flash setting for B
Flash setting for C
Components
LCD Screen
Flash setting for D
Focal Distance
Aperture
Strobe flash
FEB logo
Times
Master control camera
series

07 08
Hot Shoe contacts: Use it to connect with camera,
compatible with Canon.
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.
09 10
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 modes 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 Canon Mix mode, Canon Master Mix
mode and Canon Master Multi mode.

Press 【FN】for 2 seconds,
system will change between
customized settings and flash
modes, enter custom mode,
press 【↑】/【↓】to select
options, press 【←】/【→】
to set option number.
Wireless channel setting
11 12
Custom function/FN
PS: The option of Fn number 1-3 can be set by Canon's online status by accessing the "External flash's custom function settings" in the camera menu.
Custom function
serial number
Functions
Status setting Instruction
Flash surrounding exposure automatically cancel
Enable
Flash surround exposure order Automatical focusing assist
Disable

Wireless channel setting
13 14
Sync mode setting
In universal mixed mode, press
【 C 】 button for 2 seconds,
the sync mode will change
from “high- speed sync ”,
“back curtain sync ”,
“front curtain sync(no pic)”.
In Canon master mixed mode,
press switch button for 2
seconds, the sync mode will
change from “high-speed
sync ”and “front curtain sync(no pic)”. Achieve
different flash effects.
wireless channel light flickers
and enters wireless channel
setting,press 【←】/【→】
to set channel from 1 to 16.

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 Canon 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 Canon),
available for sync trigger, The highest sync speed is
1/250s or lower.
15 16

A: Canon mixed mode
1.Grouping mode and parameter setting
① Press【MODE】button to select transmitter mode
as Universal Mixed mode (as pic showed)
3 MODE
A：Canon mixed mode
B：Canon master control mixed mode
C：Canon master control Multi mode
Canon mixed mode
17 18
② Press 【A】/【B】/【C】/【D】for a few
seconds to select or exit flash group setting,
The arrow refers to the group you’re setting.
③ After selected a group, press 【MODE】button
to set the flash mode of the group,every modes,
settings are as below:
TTL:
Compatible with E-TTLII, Exposure compensation
adjustment available from -3.0EV to +3.0EV, total
22 levels; press【↑】or【↓】button to change
Focal distance for different groups.
M:
Flash output range 1/128~1/1, press【←】/【→】
to increase/decrease 0.3EV, 22 levels available.
Press【↑】/【↓】to change group focal
distance number.
OFF:
Does not engage flash.

In this mode, it’s available for each flash group to
engage expose via different flash mode and power.
Flash groups which are set in TTL mode can accomplish
E-TTLII flash while connecting Canon cameras.
2.Only available for series A cameras, cameras
exposure mode need to be P/AV/TV/M.
Canon mixed mode Canon mixed mode
19 20
④ After you finished the flash setting 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.
Connect series A cameras in this mode, you can’t set
manual mode while the wireless mode is off, TTL or M
mode only can be set by transmitter setting.
When you need to synchronize the back curtain,
please select this mode.
① Press 【Menu】to select flash control-external
flash function setting.

② In this mode, Camera shows info as picture.
Canon mixed mode Canon mixed mode
21 22
③ Via internal menu setting, the user can set the sync
speed level for shutter and exit group setting in
FEB exposure mixed mode, or press【Test】or
the transmitter passes the settings to each group
of flash lights on the same channel while the flashes
are online, after the flash displays the received
modes and parameters, it executes the appropriate
operation.

Setting for groups
① Press 【MODE】to select transmitter mode as Canon
master control Multi mode (as pic showed)
Canon master control Multi mode
23 24
Automatic focusing assis
Master Control Multi mode
Wireless Channels
Group A Switch
Group B Switch
Group C Switch
Group D Switch
Focal distance
Aperture
Strobe flash output power
Strobe flash frequency
Strobe flash times
Canon master control Multi mode
② In the non-set state, press 【←】/【→ 】to set
power output for Group A, Press 【A】/【B】/【C】
【D】for a few seconds to select or exit flash group
setting. After selected a group, press 【MODE】
button to set the flash mode of the group, every
mode.
Press 【A】/【B】/【C】/【D】for a few
seconds to select or exit flash group setting,
The arrow refers to the group you’re setting.
to set the flash mode of the group,every modes,
settings are as below:
After selected a group, press 【MODE】button

1-2
1/4
1-4
1/8
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 times
Canon master control Multi mode
25 26
Compatible Devices
③ Press【OK】button, when Frequency flickered,
press【← 】/【→ 】button to set flash frequency
from 1-199Hz.
④ Strobe flash
Press【OK】button, when times flickered, press
【←】/【→】to set flash times, the maximum
flash times are influenced by Group A Power.
1. 3 series Canon Camera, based on different
functions.
I. Available for Camera-Menu-controlled external
flashlight Canon Types (Abbreviated Series A):
450D、500D、550D、600D、650D、700D、
1100D、1000D、40D、1DMarkIII、1D arkIV、
1DsMarkIII5D、7D、60D、50D、5D MarkII、
MarkIII
II. Available for ONLY Camera-Menu-controlled Flash
Light Parameters & modes; NOT Available for
Camera Menu-controlled external flashlight Canon
Types (Abbreviated Series B):10D、20D、30D、
300D、350D、1D、1DMarkII、5D
III. Available for other brands Cameras with standard
Hot Shoe (Abbreviated Series C)

Specification List
27
System mode: Digital FSK 2.4G HZ Wireless Trigger
Communication Distance: 50 meter
Wireless Channel: 16
Flash mode: E-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: Available for FEB, 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)