An 85mm f/1.8 lens is a staple for portraits, and the Brightin Star 85mm f/1.8 autofocus enters the Sony E and Nikon Z market at a price that undercuts most rivals. When a full frame autofocus lens costs around $300, you need to know exactly what you’re giving up and what you’re not.
Coming to you from Christopher Frost, this detailed video reviews the Brightin Star 85mm f/1.8 for Sony E and Nikon Z mounts. Frost tests it on a demanding 61 megapixel Sony a7CR, which quickly exposes weak optics. In the center, the results are better than the price suggests. At f/1.8, sharpness and contrast are already very good, with low purple fringing. Stop down to f/2.8 and the center becomes razor sharp. The corners, however, tell a different story on high-resolution full frame bodies, where they stay softer even as you stop down.
The build is more solid than you might expect at this price. You get an aperture ring, an AF/MF switch, and an autofocus lock button. The catch is the aperture ring turns too easily and can slip out of the “A” setting without much resistance. Autofocus is reasonably quick and mostly accurate, though it takes a brief moment to lock. There is visible focus breathing and no image stabilization, so you’ll rely on in-body stabilization if your camera has it.
On APS-C, performance improves thanks to the sweet spot effect. When Frost switches to a 26-megapixel crop mode, the corners look much cleaner. At f/2.8 through f/5.6, sharpness is excellent across the frame. If you use a 24- or 33-megapixel body, you’re unlikely to see the same corner softness that appears on a 61-megapixel sensor. That makes this lens more appealing depending on the camera already in your bag.
There are weaknesses you need to weigh carefully. Close-up performance is the biggest one. At the minimum focus distance of 80 cm, image quality drops significantly at f/1.8. It improves at f/2.8 and only becomes properly sharp by f/4. If you plan to shoot tight detail work, that limitation will show. There is also noticeable longitudinal chromatic aberration at wider apertures, and some loss of contrast when bright light hits the edge of the frame. Vignetting at f/1.8 is obvious on full frame, and there is mild pincushion distortion with corrections turned off.
Where this lens earns its place is bokeh. Background blur is smooth, with clean specular highlights and a pleasing falloff that suits portraits well. The cat’s eye effect appears in the corners, as expected, but the overall rendering looks attractive and natural. For an 85mm f/1.8 at this price, that counts.
If you’re choosing between this and a more expensive 85mm option, the decision comes down to how much you value corner sharpness, close-up performance, and handling refinements over price. Check out the video above for the full rundown from Frost.
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