What does the SL mode do on a Yongnuo YN565EX flash?
Asked 2/26/2015
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On the Yongnuo YN565EX, I understand that S1 and S2 are optical slave modes. What is the SL setting for? I was hoping it meant the flash could receive signals from a wireless trigger without needing a separate receiver. Does SL refer to a different kind of remote control mode?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
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If you have the YN565EX version for Nikon, the SL mode allows it to receive signals from a Nikon Master flash using the automated iTTL flash exposure system. S1 & S2 modes are for manually set flash levels.
If you have the Canon version, SL mode similarly enables the YN565EX to work as a receiver with Canon's e-TTL automatic flash exposure system.
Both of these systems use light from the controlling flash to send exposure information; they are wireless, without the need for a separate trigger, but are not radio-based systems, and the YN-565 EX does not contain a radio receiver. Do note that (at least with the Canon e-TTL system) the controlling flash mounted on the camera can be set to only emit light to control the off camera slave just prior to the shutter opening, without actually adding any light to the frame during exposure.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
11y ago
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Generated from our catalog & community — verify before relying on it.
SL is for the flash’s "smart" optical slave mode, not a built-in radio receiver.
On the YN565EX, S1 and S2 are basic optical slave modes that fire when they see another flash. Those are manual-style modes.
SL is used with the camera brand’s optical TTL wireless system:
- Nikon version: Nikon CLS/i-TTL optical wireless
- Canon version: Canon optical e-TTL wireless
In SL mode, the flash can receive control information from a compatible master/commander flash or camera system using pulses of light. That allows features beyond simple firing, such as TTL exposure control, and in some systems other remote flash settings.
So yes, it works wirelessly without a separate receiver, but only as an optical system using visible/IR light from a master flash—not as a radio trigger system. The YN565EX does not have a built-in radio receiver, so a radio trigger would still require an external receiver.
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