Yongnuo RF 603 II/C3 (Version II) 2.4GHz Wireless Flash Trigger for Canon 10D/20D/30D/40D/50D/1D/1D Mark II/1D Mark III/1D Mark IV/1Ds/1DS Mark II/1Ds Mark III/5D/5D Mark II/5D Mark III/6D/7D/1DX

This is a review of the Yongnuo RF-603CII-C3 (currently listed as the RF-603CII)Great little wireless flash trigger and wireless shutter release.This does two separate things: triggering off-camera flashes, and letting you press the shutter remotely. The two functions are completely separate - you can use one of these as either or as both at the same time.Note there are two different shutter release sockets on different models of Canon cameras. If your camera is not listed as supported in the description above, then check out the other Amazon listing for the RF603CII-C1 which has a different shutter release cable. Link:  Yongnuo RF-603CII-C1 Wireless Flash Trigger Kit For Canon 350D 700D 60D 600D 70D The box includes two identical RF-603CII wireless gadgets, that can work as a transmitter or a receiver or both, and a separate cable for the shutter release feature. Each wireless gadget needs two AAA batteries, that are not included (so buy four AAA batteries in total).Each wireless gadget has a hot shoe at the bottom to attach it to a camera or stand, and a hot shoe at the top to attach it to a flash. The hot shoe at the bottom has a locking feature, which is a plastic nut that screws down on plastic threads to firmly attach it to the camera/stand. I'm not convinced this plastic nut will last very long, it feels a bit cheap and there are notches for grip that look like they'll be weak points, so I'm going to be careful with it.Apart from the plastic nut, build quality is good - metal hot shoes and good quality plastic casing and switches.There are 16 radio frequencies, set with little switches behind the batteries that are fairly easy to change if you need to, but won't be changed accidentally. The default frequency works fine unless there's another photographer near you who's also using these, in which case one of you needs to switch to a different frequency.For flash triggering: This is part of a system of compatible devices from Yongnuo, so you can mix-and-match depending on what you're trying to achieve. You need a transmitter on the camera - I've tested with one of these, or with a YN560 IV flash in transmit mode, or a YN560-TX transmitter/controller. You also need a receiver on each flash - I've tested with one of these on a Canon 430EXII flash, or with the YN560 IV flash's built-in receiver, or a combination of those. It works well. Manual mode only, does not support TTL, but if you're doing multiple flashes then you're going to want manual mode anyway so you can get the shot looking good. Tested mainly with shutter speeds of 1/200, but a test at 1/250 worked too.Since this RF-603 transmitter has a hot shoe on the top, you can put it on your camera and still use an on-camera flash or other hotshoe-mounted accessory, as well as the wirelessly-triggered flashes. However, this only passes through the manual mode flash signals, you can't do TTL that way.Each RF-603CII wireless gadget has a standard PC socket that should be able to trigger a studio flash, if you buy the right cable, but I haven't tested that. Yongnuo makes  the LS-PC635 cable  for that, but it's a standard connector so you should be able to use any flash cable with a PC connector. This is also supposed to be compatible with the YN560 III flash's built-in receiver, but I haven't tested that.For wireless shutter release, you have one RF-603CII wireless gadget near the camera - you'd typically mount it on the hotshoe so it's out of the way and so it can trigger your flashes, but it doesn't have to be on the hotshoe. You connect that to the camera using the cable provided. Then you press the shutter button on any other RF-603CII wireless gadget that's in TRX mode. The shutter button has the usual two-step action, so you can half-press to autofocus then fully press to take the photo.The RF-603CII wireless gadget has a switch with three positions: Off/TX/TRX. I normally leave it set to TRX mode, in TRX mode the button triggers the camera as described above. If you want to test the flashes without taking a picture, change it to TX mode and press the button.

Bought this in conjunction with one of thier other items - easy to use good value '

Ok

I bought this to use as a remote trigger for my Canon 5D after finding that the wireless remotes don't work. These are great! Easy to use and the remote is fairly small.

These work well when they do work but have let me down badly during photo shoots which is a big ‘no’ from me.

My daughter bought me this for Fathers Day, as I was looking for one so the perfect solution to both our deliberations. Read many reviews to confirm if this would work with my Pentax K10D, which it does. I have the Yongnuo 560III flash which is a manual speedlight, but has a built in wifi receiver. So I now have 2 wifi flash triggers for a very reasonable price.I think the trigger can control the camera, for focus and shutter, but I think I would need to order a spcific cable to link the camera and trigger, via the remote jackpoint on the side of my K10D. This would then give me a remote capable of taking shots at up to 100m. At least thats what I think it was trying to tell me. Maybe for some other time. I dont really have the need at the moment, but it may be sueful to someone, so I thought I would mention it. Just ask the company who supplied it, they are more than happy to help.

Have used these a few times and no problems. I had to change the cable as I wanted to use this with my Fuji XT1 so needed a jack to jack connector, but I knew that before ordering and the other cable was bought for only a couple of pounds. The devices are not the most robust construction but should last if treated well. Being able to use these as a remote shutter as well as off camera Flash trigger is great. I have not tested it regarding distance but it has worked well so far.

Surprisingly it wouldn't work with my flashgun (Sigma EF-530 DG Super, Canon compatible upgraded in 2014) causing it to lock up after one flash, which I assume means the trigger software was faulty or has not been tested with popular Canon compatibles.I have given it 4 stars as I know it well works well with Canon flashguns and the triggers feel well made for the price. The battery door does feel as though it might become a weak point (no proof this would be so) but again for the price who could complain?