I recently purchased a used SEL16f28 wide angle lens and VCLECF1 fisheye converter for the Sony NEX3 from Eric Cheng, and gave the combo a try around church and DC last Sunday.
I’ve found the lens combo is also good for macro shots, as evidenced by these pictures of cherry blossoms and cats. (The cats were, of course, the first test subjects for the lenses.) The fisheye isn’t perfect; I’m noticing some blurry distortion and light contrast flare around the vignetted edges — but for my amateur-level needs it’s not too much of a problem.
I also discovered that the camera has a 3:2 aspect ratio setting (all this time I’ve had it at 16:9, unaware the widescreen-like format was missing a lot of vertical visual detail). This, plus the panoramic lens angle, makes the combo much better for non-telescopic astrophotography, and should also be nice for cherry blossom season this week. (Although I’ll still want to keep the standard 18-55mm kit lens on hand at all times for when I need optical zoom, and when the novelty of fisheye fades.)