NiSi Sunstar 9mm f/2.8 Sunstar ASPH 9mm

A fully manual, tank-built 9mm prime that rewards patience with killer sunstars and sharp landscapes. If you need autofocus or EXIF data, pretend this lens doesn't exist and buy the Sigma 10-18mm.

What surprised us most is how forgiving the focusing is. At 9mm, depth of field is huge, so nailing focus is rarely stressful, even at f/2.8. Sharpness holds up well across the frame, and the coma performance is good enough that stars stay round in the corners. Our database gives the optical quality a low percentile score, but that's almost certainly because ultra-wides inevitably show some distortion and vignetting. In real world use, it's sharp, and that sunstar effect is the real standout, not just a marketing line. The aperture ring clicks with a satisfying precision, and flaring is well controlled.

The most logical rival is Sigma's 10-18mm f/2.8 DC DN for Canon RF, which gives you autofocus, a zoom range, and similar brightness, but it costs more and won't produce the same dramatic sunstars. The Canon RF-S 18-150mm is far more flexible but much slower and narrower, so it's not even in the same creative ballpark. For Sony E shooters, the Viltrox AF 9mm f/2.8 offers autofocus, but that doesn't help on Canon RF. If you need autofocus and everyday usability, the Sigma is the smarter buy. If you want maximum wide-angle character and don't mind losing creature comforts, the NiSi is unique.

Prices for this lens swing wildly, from around $299 to over $600 depending on the seller. At the lower end, it's a steal if you value the sunstar quirk and don't mind manual focus. Up near $600, it becomes a harder sell against autofocus zooms. Shop carefully and grab it when the price is right.

The NiSi 9mm f/2.8 Sunstar is the kind of lens that makes you remember why manual focus can be so satisfying. It's a fully manual, ultra-wide prime built for Canon RF APS-C bodies, and it has one very specific party trick: those crisp, multi-point sunstars when you stop down. The all-metal build feels fantastic, the focus ring is buttery smooth, and at f/2.8 it's bright enough for astro work. But let's be real, this is not a general purpose lens. There's no autofocus, no image stabilization, and it doesn't even pass EXIF data to the camera. If you want autofocus or zoom flexibility, look elsewhere. If you're after a deliberate, character-rich ultrawide for landscapes and night skies, this thing is a gem.

If you're looking for a flexible travel zoom or you rely on autofocus to get the shot, this lens is not for you. Skip it and grab the Sigma 10-18mm f/2.8 DC DN for Canon RF instead. It's sharper, faster to use, and far more adaptable.

This lens isn't for everyone, and that's exactly the point. When you buy the NiSi 9mm f/2.8 Sunstar, you're choosing manual control and a one-of-a-kind starburst look over convenience. Scenery photographers and astro shooters who are comfortable with manual focus will adore it. Everyone else should just get the Sigma 10-18mm f/2.8 and call it a day.