Orlit ST-RT User manual
ST-RT TTL 2.4Ghz
Wireless Transmitter
for Canon RT
2
Conventions Used in this Manual
Icons in this Manual
: Indicates the selection dial.
: Indicates the select/set button.
• This product was designed for Canon EOS cameras
and flashes manufactured after 2012 incorporating the
Canon RT wireless radio system.
• The Orlit ST-RT is compatible with the Canon RT wire-
less radio system.
Introduction
The Orlit ST-RT Wireless RT Transmitter is designed espe-
cially for use on CANON cameras and adds 980ft/300m
of remote freedom, without a speedlight, to provide full
TTL, Remote Manual, and HSS, in 5 individual groups.
The wireless radio protocol is based on the popular
Canon RT radio system employed in the Canon 600EX-RT
speedlite. Using a Orlit ST-RT on the camera’s hot shoe,
a Canon photographer can easily adjust the exposure
for any Orlit Rovelight RT Family Monolights and Orlit
RT600C Speedlites. The transmitter is water and dust
resistant equal to the Canon EOS-1D series cameras.
Before using this transmitter, please read this instruction
manual and familiarize yourself with the manuals of your
camera and flashes you are controlling.
3
Using the Transmitter with a Camera
Using with an EOS digital camera (Type-A camera)
You can perform wireless auto flash shooting easily.
Using with an EOS film camera
When using with an EOS film camera compatible with
E-TTL II and E-TTL auto flash systems (Type-A camera),
you can perform auto flash shooting.
This unit cannot be used with an EOS film camera with
TTL auto flash system (Type-B camera).
Chapters
Getting Started
Preparations for wireless flash shooting
Introduction
Wireless Flash Shooting: Radio Transmission
Wireless flash shooting with radio transmission
Setting Transmitter Functions with Camera
Operations Setting the transmitter functions
from the cameras menu screen
Customizing the Transmitter
Customizing with Custom Functions and
Personal Functions
Reference
System map, FAQ
1
2
3
4
5
4
Nomenclature
Radio Transmission
Confirmation Lamp
Function Button 3
Function Button 4
Power Switch
Flash Exposure
Confirmation Lamp
Battery Compartment
Cover
Mounting Foot
Contacts
Remote
release
terminal
Mini USB port for
firmware updates
LCD Panel
Function Button 2
Function Button 1
Linked Shooting Button
Flash Mode Button
Charge Lamp /
Test Flash Button
Select Dial
Select/Set Button
Mounting Foot Lock Lever
Lock-Release Button
Autofocus assist
illuminator
Locking Pin
5
Nomenclature
LCD panel
Radio transmission wireless shooting
E-TTL II/ E-TTL Autoflash
RATI O
Flash exposure level
E- TT L I I/E- TT L
autoflash
Flash exposure
compensation amount
Flash ratio
Firing group
:
Flash ratio
FEB
FEB sequence
Beep
Custom Functions
: Flash exposure
compensation
Master
High-speed sync
: Radio transmission
wireless shooting
Manual flash
Manual Flash
Manual flash output
The display will show only the settings currently applied.
The functions displayed above function buttons 1 to 4, such as < >
and < >, change according to the setting’s status.
When a button or dial is operated, the LCD panel illuminates .
Channels 1-15 / Auto
6
Group firing
Linked
shooting
Stroboscopic flash
Multi (Stroboscopic) flash
Number
of
flashes
Flash
frequency
Firing
group
Flash
mode
Group flash
Linked
shooting
7
Installing the Batteries
Attaching and Detaching the Transmitter
1. Install two AA/LR6 batteries, AA/LR6 rechargeable
Ni-MH or lithium batteries can also be used.
2. Make sure the + and - battery contacts are correctly
oriented as shown in the battery compartment.
3. Using AA/LR6 batteries other than the alkaline type
may cause improper battery contact due to shape of
the battery contacts.
4. Please replace the battery promptly when the low
power indicator is displayed.
5. Use a new set of two batteries of the same brand. When
replacing the batteries, replace both batteries at once.
1. Attach the transmitter all the way into shoe. Slide the
transmitter shoe foot carefully onto the camera’s hot shoe.
2. Secure the transmitter Slide the lock lever all the way
to the right to secure the mount. When the lock lever
clicks in place, it will be locked.
3. Detach the transmitter While pressing the lock-release
button, slide the lock lever to the left and detach the
transmitter.
NOTE:
Before attaching or detaching the transmitter,
be sure to turn the transmitter power OFF.
1
2
8
Turning on the Power
Set the power switch to < ON >
The LCD panel illuminates.
The charge lamp lights when the
wireless shooting (slave) is ready.
During wireless shooting,
press the button to fire a test flash.
Auto Power Off
To save battery power, the power will turn off automat-
ically after a time of idle use.To turn on the transmitter
again, press the cameras shutter buttonhalfway, or press
the test flash button.
Lock Function
By setting the power switch to < LOCK >, you can disable
all button and dial operations. Use this to prevent the
transmitter function settings from being accidentally
changed after you set them.
LCD Panel Illumination
When a button or dial is operated, the LCD panel
illuminates in green for 10 sec. When setting a function,
the illumination continues until the setting is complete.
NOTE:
1. Test Flash cannot be performed when the camera’s
delay timer is active.
2. When the menu option for shut-off is set to “ATSAVE“,
the transmitter settings are stored even when the
power is turned off.
9
Wireless Flash Shooting
The Orlit ST-RT makes it easy to shoot using advanced
wireless multiple flash lighting. Any flash, speedlight or
monolight compatible with the Canon RT radio system
can be controlled with this transmitter, the same way as
normal E-TTL II / E-TTL autoflash exposure.
The system is designed so that the settings of the trans-
mitter attached to the camera (master) are automatically
reflected on the Speedlite that is wirelessly controlled
(slave). Therefore, you do not need to adjust the slave
unit while shooting.
The basic relative positions and operating range are as
shown in the figure. You can then perform wireless E-TTL
II/E-TTL autoflash shooting just by setting the master unit
to < ETTL >.
Positioning and Operation Range (Example of wireless
flash shooting)
Autoflash Shooting Using One Slave Unit
You can divide the slave units into two or three groups
and perform E-TTLII/E-TTL auto flash shooting while
changing the flash ratio (factor). In addition, you can
set and shoot with a different flash mode for each firing
group, for up to 5 groups.
Wireless Multiple Flash Shooting
Transmission distance
Approx 30m (98.4 ft.)
10
AB
A
B
C
A
B
D
E
C
E-TTL II
Manual flash
Manual flash
Auto external
flash metering
Manual flash
Ceiling
Restrictions on Functions Depending on the Camera
When performing radio transmission wireless flash shoot-
ing, restrictions may apply to the flash mode, maximum
flash sync speed (referred to below as the “flash sync
speed”) and high-speed sync function, depending on the
camera that you use.
Wireless Settings
To perform wireless shooting, set the transmitter (master
unit) and flash (slave unit) with the following procedure.
Master Unit Setting
Check that the LCD display on the ST-RT indicates
“MASTER”
Slave Unit Setting
The receiver slaved radio flash will be controlled as in one
of the selected groups as set on the slaved flash. Please
see instruction for setting the group for your flash.
The RF channel/ID set
Set the same channel and ID for both the master unit and
slave unit.
To avoid interference with wireless multiple flash systems
using radio transmission that are used by other pho-
tographers, or with other devices that use radio waves
(wireless), you can change the transmission channel and
wireless radio ID.
Autoflash Shooting
with Two Slave
Groups
Autoflash Shooting
with Three Slave
Groups
Shooting with a
Different Flash Mode
set for each group
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