Yongnuo RF 603 || C1 Wireless Flash Trigger
Improved Features -
- Higher Sync Speeds, up to 1/320th (RF-602 were slow, RF-603 were very slow)
- Locking Rings on trigger foot (RF-603 and flash on top would fall off the camera)
- Pass Through Hotshoe now usable (see point above) though still manual only no TTL
- Power Switch Finally Moved to the Side (was blocked by the flash on 602 & 603)
- Compatible with non Canon/Nikon and single firing pin cameras (RF-603 was not)
- Test Fire Button works off the camera hotshoe (for taking light meter readings) (RF-603 did not)
- 300v Safe Trigger Voltage (for hotshoe and PC sync port) (602/603 where low 12 volt safe limit)
Sync Speed –
Low sync speed was always one of the main shortcomings of the RF-602, and even worse with the RF-603. Now that this is improved with the RF-603 II, it simply means you should be able to get a clean frame without any shutter (or black band) showing in the frame at your cameras maximum sync speed (1/250th etc). Though the Canon 5D series sometimes have to drop to 1/160th even with an instant sync cord.
YongNuo are stating this as 1/320th maximum. But that figure relates to cameras with regular X-sync speed. Using a camera with an electronic shutter the RF-602 would achieve up to around 1/800th, and RF-602 1/600th. Many faster triggers would do 1/1200th plus, and that’s likely closer to where the RF-603 II would be now as well.
Locking Rings –
The original RF-603 has no locking rings on the foot. This was a major oversight now that a flash could be mounted on top of the transmitter on the camera. They would both simply fall off the camera hotshoe! The RF-603 II now has locking ring and locking pin.
The RF-603 II is still manual pass through hotshoe only though (the extra contacts seen on the hotshoe are only for the flash wake up feature).
This is being picky, but we know the cut outs around locking rings makes them very hard on your fingers, and other triggers have already gone this way, and started going back again to full rings where possible. Just one cut out does the trick to access the screws underneath when needed. Batteries are standard AAA.
Power and TX / TRX Switch -
Firstly the power switch has finally been moved to the side of the case, so that you don’t have to remove the flash from the trigger to switch it on and off like the RF-602 and 603 require. This alone would enough reason for many people to want to update.
More significant functionally though is the new TX – TRX option switch. The RF-603 are transceivers, meaning they are the same unit for transmitter and receiver, and can switch automatically between transmitting and receiving mode. This ability caused a number of extra issues in the original RF-603 though, like not being able to fire on non Canon/Nikon cameras, or fire the test fire button off the camera hotshoe.
So to help resolve these issues YongNuo have added a switch to the new FR-603 II allowing you to set them as either TX or TRX. TX being set to transmitter mode only, and TRX as self switching. TX mode is used when the transmitter is held in hand for taking light meter readings with the test fire button, or when used as transmitter only on the camera. If using combined flash and shutter release TRX mode would be used. Receivers would always need to be set to TRX.
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