You focus the lens and presses the shutter button halfway, the flash emits (if necessary) immediately be AF-assist illuminator helps the camera to focus the camera. Almost simultaneously, the flash has read the currently set focal length of the lens of the camera and provides the flash-focus on the nearest value that matches this focal length, a.
One must only press the shutter button completely and receives perfect exposures, and all fully automatic!
Likewise, you can adjust the zoom by lightning and manual means Deflector (and a white additive aperture to produce harmonic light) fully illuminate even focal lengths of 14 mm.
You can swivel the flash in all directions, which I think is very convenient and there is rare for this price where.
The only thing I noticed is negative so far: I use my EOS 450D with a Tamron 16-300 superzoom. As a focal length of 250 mm the flash itself is reset to its smallest focal length. Until now, this was still not a disadvantage, because who wants Ranzoomen so far because it is so far away can not sparkle as much anyway.
PS: I'm using it with eneloop batteries.
