The NEX is very bright, so tremendous in most cases is unnecessary, but nevertheless already represents for me the question what Sony actually thinks in this issue ...
But now to the HVL-F20S:
Clear terms the shadows, even when fully extended superzoom 18-200 (SEL 18200) with mounted lens hood, I have no more problems!
Settings for direct and indirect (Bounce) flashes. In addition, you can ZSL. still put on TELE, so has the flash more coverage outdoors.
In addition, while a "wide-angle diffuser" when using an ultra wide-angle converter. A cheap plastic part, nothing more.
Here is the complete bolt from the plastic, so I find it slightly overpriced.
In the directions (not very clear) to find the exact conductivities for all the possible settings and the use possibilities.
Also quite nice, a table showing the range of the flash based on standard position, telephoto and wide-angle diffuser and the respective aperture and ISO values.
As for the frequent incidence of errors criticized, I can not say much. I have the flash for only a few days use.
Conclusion: 4 stars, when the flash is broken, there's an update ;-)