Rokinon RK20M-C 20mm f/1.8

A manual focus gem for astro and landscape shooters who care more about sharpness than fancy features. Skip it if you need autofocus, but if you don't, this is one of the best values in wide-angle glass.

The sharpness here is a genuine standout, landing in the top tier of our database. Center sharpness is excellent wide open at f/1.8, and by f/2.8 the corners clean up nicely, which is exactly what you want for night sky shots. The real surprise is how well it controls distortion for such a wide lens. The bokeh is nothing to write home about, and the seven-blade aperture doesn't produce the creamiest backgrounds, but that's not why you buy a 20mm. The manual focus ring is damped nicely and makes nailing focus at infinity a breeze, even in the dark.

Stacked against the Nikon NIKKOR AF-S DX NIKKOR 16-85mm f/3.5-5.6G ED VR, the Rokinon destroys it in low light and sharpness but loses on versatility and stabilization. The Nikon zoom is the practical daily driver, the Rokinon is the specialized tool for when image quality matters most. Compared to the Tamron Di III 18-300mm f/3.5-6.3, it's no contest for pure optical quality, but the Tamron gives you autofocus and a massive zoom range. Pick your poison: convenience or image quality.

The value story here is a bit wild. We're seeing prices from $444 all the way up to some absurd $95,685 listing, which is clearly a data error. Ignore the crazy number. At the real-world price around $450, this lens is a steal. You're getting optical performance that rivals lenses costing twice as much. If you can live without autofocus, the value is hard to beat.

The Rokinon 20mm f/1.8 is the lens you buy when you want that ultra-wide, fast-aperture look without selling a kidney. It's a manual focus prime that absolutely sings for astrophotography and landscapes, delivering sharpness that punches way above its price tag. Just know what you're signing up for: no autofocus, a plastic shell, and a few quirks that remind you this isn't a first-party Nikon lens.

If you're shooting events, sports, or anything where subjects move fast, this lens isn't for you. The manual focus will drive you nuts. Go grab a used Nikon 20mm f/1.8G instead and get autofocus with similar image quality.

If you shoot astrophotography, landscapes on a tripod, or real estate and you're comfortable with manual focus, just buy this lens. The sharpness and low distortion at this price are fantastic. It's a specialized tool that excels at its niche, and the image quality will make you forget about the plastic build. For everyone else who needs autofocus for moving subjects or events, look elsewhere.