Anyone tried cheap fisheye adapters?
The quality is very, very poor.
I can post pictures, but it suffices to say that the CA of these adapters is horrific, the picture only has details around the center - the edges are very smeared.
If you shoot JPG mode, the NEX processing algorithm will try to 'smooth' out much of the poor quality, even in the center, resulting in a loss of detail and a 'water-color' look & feel reminiscent of the much smaller sensor P&S cameras.
There is also no correction software to recover some of the poor quality.
Really, the two Sony adapters, ECU and ECF, are worth their price.
The ECU converts the 16mm into a 12mm wide angle lens
The ECF converts the 16mm into a 10mm fish eye lens
Spending the extra $100 for the ECF over the cheap adapter is soooo worth it.
They do not vignet on the 16mm lens, but they do on the 18-55 - horribly.
Same applies to the tele converters.
If you only want the macro ring, I think that you can get these for a lot less.