Koah Artisans Series 55mm f/1.8 55mm

The Koah 55mm f/1.8 delivers bokeh in the 89th percentile thanks to its 12-blade diaphragm, but optical quality sits at the 3rd percentile. The 6004mm minimum focus distance means you can't shoot anything closer than 20 feet. At around $50 USD it's a cheap bokeh experiment for Canon RF shooters, but not much else.

Let's start with the good news because there is some. The bokeh on this thing is a standout, ranking in the 89th percentile across all lenses in our database. That 12-blade diaphragm is doing real work, producing smooth, creamy backgrounds that you'd normally associate with glass costing ten times as much. The f/1.8 aperture also sits at the 70th percentile, which is solid for a budget prime and gives you decent low-light flexibility and shallow depth of field.

Now the bad news. Optical quality is at the 3rd percentile. That's not a typo. Three. Out of a hundred. We're talking soft corners, likely chromatic aberration, and overall image quality that falls behind nearly everything else we've tested. The 7 elements in 5 groups design is basic, and it shows. Autofocus is manual only, ranking at the 15th percentile, which is expected at this price but still worth noting. And that 6004mm minimum focus distance is genuinely baffling. You can't take a headshot with this lens. You can't even take a full-body portrait without backing up significantly.

Stacked against the competition, the Koah 55mm f/1.8 is in a weird spot. The Nikon NIKKOR 20059 and Sony E PZ 16-50mm f/3.5-5.6 OSS both offer autofocus and stabilization, things this lens completely lacks. The Canon EF-M 15-45mm f/3.5-6.3 IS STM brings image stabilization and a more versatile zoom range, though it gives up the wide aperture. Even the GoPro HB-Series and FotoZ KZ-03, which aren't traditional photography lenses, offer more practical everyday usability. The Koah wins on bokeh and aperture, but loses on nearly everything else. If you only care about background blur and already own a Canon RF body, it's a cheap experiment. If you want a lens that actually works for general photography, every competitor here is a safer bet.

At around $50 USD, this lens is dirt cheap. But cheap only matters if the thing works for what you need. The portrait score of 52.8 out of 100 is the best this lens manages, and even that is mediocre. The budget score of 32.3 out of 100 tells you everything about the value proposition here. You're not getting a hidden gem, you're getting exactly what you pay for, and in some areas, less. The INR 11,160 and JPY 13,731 listings are in different currencies and not directly comparable, but the pattern holds: this is a budget lens with budget compromises baked in.

The Koah Artisans Series 55mm f/1.8 is a lens that looks great on paper until you actually read the paper. A 55mm prime with a 12-blade diaphragm and f/1.8 aperture for around $50 USD? That's the kind of spec sheet that makes budget photographers do a double take. And the bokeh ranking backs it up, sitting at the 89th percentile in our database. That's genuinely impressive for a lens this cheap.

But then you hit the rest of the numbers. Optical quality lands at the 3rd percentile. Manual focus only, no stabilization, no weather sealing, and a minimum focus distance of 6004mm, which is nearly 20 feet. For context, that means you physically cannot focus on anything closer than a parked car two spaces away. The total score of 32.8 out of 100 tells the real story here.

Skip this lens if you shoot anything other than distant subjects with dreamy backgrounds. The 6004mm minimum focus distance alone disqualifies it for most everyday photography. If you need autofocus, image stabilization, or sharp optics, look elsewhere. The optical quality at the 3rd percentile means your phone camera likely produces sharper images. And if you shoot landscapes, the 11.4 out of 100 score in that category should be all the warning you need. This lens is for bokeh enthusiasts on a $50 budget and basically no one else.

The Koah Artisans Series 55mm f/1.8 is a one-trick pony, and the trick is bokeh. If you're a Canon RF shooter who wants to play with creamy backgrounds on a $50 budget and you're willing to manual focus everything from 20 feet away, this lens delivers that specific experience. But the 3rd percentile optical quality and the absurd minimum focus distance make it nearly useless for anything else. The total score of 32.8 out of 100 is generous, honestly. This is a specialty lens for a very narrow use case, and most people should save their money.