words and image source/photographer : Eksovichea Tito Hak


Essentially a general external camera flash with manual controls, it will work on Canon or Nikon DSLR's. It's manual in the sense that the flash settings won't automatically change as you alter the settings on your Canon DSLR camera body and lens. You have to tap in the appropriate intended settings that you're going to use on your camera via the controls on the back of the flash even when its mounted on the camera!  Flashguns with auto calibration when used on body would normally adjust the flashgun settings automatically for you if you need to change the focal length (ie. if using a zoom lens), aperture and ISO on your camera. But if you have no issue with manually setting the flash it shouldn't be a problem. If you want those kinds of auto calibration features you'll have to pay around the 80 to 120 quid mark (depending on where you buy) for the 565EX version, but keep in mind that the 565EX can't be used as a master for remote/slave flashguns with TTL or ETTL features in a multi-flashgun setup.

The YN560 III is not compatible with Canon DSLR's advance on camera or wireless external flash control menu system.




What do we mean by wireless?

 In the more general sense when talking about camera flash guns we're talking about optical wireless control via the actual flash light and flash light sensors, not radio signals. The YN560-III has basic wireless flash activation (as in it has a built in optical sensor), and it also has basic slave flash triggering modes when used as a master. 

The YN560 III does not have advance E-TTL or TTL remote wireless setting control capabilities which would normally allow you to change the settings of (a) slave flashgun(s) from either a capable/compatible assigned master flashgun or from within the Canon camera setting menu's. Meaning that if you're using multiple YN560-III flash guns via optical wireless flash triggering; you'll have to constantly trundle back and forth between your remote flash devices if ever you need to alter any settings that affect light intensity output and timings. The drawback to light activated/optical remote wireless flash triggering is that it requires line of sight, or at least some means for the light from your master flash to reach the optical sensors of your remote slave flash(es). This isn't so much of a problem if you're working in a relatively small room as the light will fill the room quite easily and bounce off the walls. Although there could potentially be a slight unwanted lag or delay if you're using bounced flash-light despite well... it actually travelling at the speed of light, ie. light being said to be the fastest physical constant in the entire known universe according to Einstein before all this quantum physics started to happen. The flash-light from the YN 560 III should make very short work of a small enclosed room. However, it does become an issue in wide open sunny spaces, large spaces, and crowded spaces where the light could be easily dispersed or absorbed before it reaches the intended assigned remote slave flashgun sensors.





Getting round the flaws of wireless flash-light activated remote triggering for slave flash devices...

The YN560-III also has built in 2.4GHz radio wireless connectivity capabilities too. This allows it to remotely trigger other flash devices of the same model and/or compatibility or be triggered by other assigned master flashgun devices of the same model and/or compatibility. Obviously radio signals don't require line of sight and can reach their intended targets unhindered by light dispersal and light obstructing objects/obstacles for the main part. Although you will notice a significant lag over an optimally ideal working light triggered setup. Mainly because radio wave signals travel a lot slower than light wave signals in being over way on the other end of the electromagnetic spectrum. 
Despite this; the radio signal triggering feature is more than adequately fast enough to hit perfectly synced flash to shutter triggers nearly every single time. (assuming that you'd set the flash up timings correctly).


Build quality - it feels extremely sturdy and reasonably weighted despite its all plastic outer construction. 

Things I liked - Has extremely fast cycle times. 3 seconds, often faster on lower power settings.



Summary

Manual flash controls with basic optical wireless slave flash trigger features. Also has very handy 2.4GHz radio wireless connectivity features for basic remote flash triggering. Also has multi-flash mode which is useful for flash lighting in burst shooting mode. Not at all bad for the price. However there's No E-TTL/TTL, you might want to consider the YN 565EX for that which does cost a little more (which also doesn't have radio wireless capabilities).  Generally an inexpensive flash that's fully featured and does the job quite nicely provided you're willing to deal with manually setting the flash gun as required.