In just about every area, OnePlus 6 outshines its price tag. When it comes to camera, there's still a noticeable gap between this and $800+ phones like Apple iPhone X, Google Pixel 2 XL and Samsung Galaxy S9. Phone comes with a dual camera setup having a 16 MP lens and 20 MP lens, both having an f/1.7 aperture. What's bizarre about this camera is how phones usually implement two different camera sensors in a dual camera setup, where one lens is usually a telephoto lens or monochrome.
On OnePlus 6 though, there's no difference between two lenses except for Mega Pixel count but don't let that mislead you in thinking that this camera setup is no different than one found on OnePlus 5T. OnePlus has increased size of sensor on main 16MP camera by 19%, and it now has a 1.22um pixel size (up from 1.12um), enabling it to pull in more light and thus perform better in low-light conditions. That's not all though, as OnePlus 6 features OIS (optical image stabilization) and EIS (electronic image stabilization) on rear 16MP snapper, further improving low-light shots by reducing camera shake and consequent blurring. Neither OnePlus 5 nor OnePlus 5T featured OIS on their rear cameras, due to their location in top corner of phone not allowing enough space, but on OnePlus 6, cameras have been shifted to middle, so there is room here.
Main camera performs fairly better, reliably snapping well-exposed and detailed shots in varying outdoor conditions. Auto-HDR mode would have been better if it was slightly more aggressive to offset average dynamic range, as by default pictures lack contrast and pop you would get from pricier phones. There is a nice Pro mode built into camera app and I found myself using it slightly more than usual here, as results are noticeably better with it. Unlike most flagship phones in 2018, there's no AI stuff going on inside this camera, so it doesn't automatically switch modes depending on subject in photos. That's no big deal, as that whole area is still a bit hit-and-miss right now, and results are never that obvious. Still, even without dedicated things like a Landscape mode, I still captured some nice city shots with plenty of depth and detail.
Low-light performance has always been an issue for OnePlus phones and while OIS and bigger pixels does make it noticeably better than before, it still lacks flagship touch. Skies in photos taken when it is dark often have an odd, false color and light sources overblow easily. Not every shot is as bad though, as if light is even and not all focused in one spot then wide f/1.7 aperture does help get some nice photos. Portrait shots still need work though, as when you compare them with shots from Google Pixel 2, they appear quite inferior.
Front-facing camera also gets a boost, with a 16MP sensor having an f/2.0 aperture, capable of shooting portrait mode pictures, although, this will be enabled via a software update at a later date. An amazing addition is gyro-EIS and Auto HDR which is now found on this front facing camera. Front-facing portrait mode on OnePlus 6 will work out what to blur with software and this means you'll still get best portrait shots from rear setup, as two cameras can gather more accurate depth data. You can shoot videos at 1080p with front facing camera and selfies come out having good amount of detail, thanks to huge 16 MP sensor.
A feature new to OnePlus 6 is slow-motion video recording, with phone able to capture footage at up to 480fps. That's not quite as super slow-mo we've seen from Samsung Galaxy S9 or Sony Xperia XZ2, but it's a welcome addition to a handset that's comfortably cheaper than either of those rivals. In good lighting conditions, slow-motion capture can produce some eye-catching results, but step inside under artificial light, or in low-light conditions, quality drops quite significantly, with footage becoming rather noisy. If you're more into traditional video recording, OnePlus 6 can also capture videos up to 4K at 60fps which is quite impressive for a phone prices under $600.
Camera app on OnePlus 6 is simple to use as well. There's quick access to portrait and video modes from main screen, with a sideways swipe switching you between modes. Swipe up and you will get more options including pro mode, time-lapse and panorama, while 2x zoom toggle is present in viewfinder, enabling you to get closer to your subject without having to physically move. Zooming in will result in a picture with less clarity, but phone is still capable of capturing good photos at this level.
In the end, I would like to say that it is a good camera setup, but certainly not the best. You cannot compare quality of photos and videos captured with Google Pixel 2 or Apple iPhone X with OnePlus 6's cameras but at this price tag, you're getting a better camera than you will get from other phones in same price range.