Sony SEL057FEC 16mm

It turns your 28mm into a bulbous, fun fisheye for cheap, but it's heavy, soft, and demands you already own the right lens. A niche converter that overdelivers on macro and underdelivers on everything else.

What surprised us most is the macro capability. With a minimum focus of 28mm, you can get ridiculously close, and in our database it sits in the 98th percentile for macro among similar products. That's genuinely great for getting warped close-ups of flowers or cat noses. But the optical quality overall is a letdown, landing in the 16th percentile, and that slow f/3.5 max aperture really cramps low-light shooting. Users often say the sharpness is 'excellent,' but our numbers show it's a classic case of expectations being low for a converter.

The Viltrox AF 9mm F2.8 is a true ultrawide prime for Sony E that's faster, lighter, and optically superior, though it's rectilinear and not a fisheye. The Sigma 10-18mm F2.8 DC DN is a stellar zoom with much more versatility and autofocus performance. Both are better lenses on their own, but neither delivers the distinct fisheye distortion this converter creates. So this is a specialty tool: if you want that bulging, curved look and you're already in the Sony 28mm ecosystem, it's the only game in town. Just be ready to trade sharpness for wackiness.

At the low end of its $348 - $45000 price spread (that $45k is likely a placeholder or error), the real-world cost is around $348 from Amazon. If you can snag it for that, it's reasonable value given the creative possibilities. But don't pay more, and don't buy it without already owning the 28mm. The extra cost of the host lens makes the total investment climb quickly, and at that point a manual fisheye from Samyang or Rokinon gives you faster apertures and better optics for similar money.

The Sony SEL057FEC is a converter, not a lens. You screw it onto the front of the FE 28mm F2, and suddenly you've got a 16mm fisheye with a 180-degree view. The one thing to know? It's a fun, affordable add-on that punches above its price for creative work, but it's clunky and optically compromises more than you'd expect from Sony. If you already own the 28mm and find one for around $350, it's a low-stakes ticket into fisheye territory. Just know it'll make your setup feel like a brick on smaller bodies.

If you don't already own the FE 28mm F2, or you expect tack-sharp optics, this isn't for you. Grab a Rokinon 12mm f/2.8 fisheye instead—it's faster, sharper, and doesn't need a host lens. Also, video shooters should stay away; the manual focus and awkward balance make it a pain on gimbals.

Buy it only if you already shoot with the FE 28mm F2 and crave a fisheye look without spending a fortune. The weight and optical compromises are real, but the macro capability and instant creative jolt make it worth the $350 if that's your scenario. For everyone else, skip this and get a proper manual fisheye like the Rokinon 12mm f/2.8. You'll get better image quality and a brighter aperture without the camera-balancing act.