The Sony RX0 is a tiny but surprisingly powerful camera. While it looks for all the world like a GoPro competitor, is waterproof, and boasts an eclectic mix of high-end video features, its pedigree is actually Sony's DSC digital stills camera line rather than the separate camcorder and action camera lines. That shows in how the RX0 operates. In many ways, its more like a miniaturized addition to Sony's impressive Alpha line of cameras than a GoPro.1
I've recently been putting the RX0's high-ISO capabilities to the test. While the camera's sensor is small relative to a DSLR or many mirrorless cameras--all of which are much larger cameras--its 1-inch sensor is surprisingly large for a camera this tiny. Combined with Sony's market-leading expertise with sensors--they make some of the best in the business--it promises very good image quality.
The RX0 has a minimum available ISO of 80, and it's maximum is ISO 12800.1 I'm focusing here on the range from ISO 3200 through ISO 12800. And I'm focusing in this post on still images; I'll tackle video separately. I've included some real-world examples below to give a sense of how it performs.
In-Camera Noise Reduction
Like other Sony cameras, the RX0 has in-camera noise reduction, and it actually works quite well--it's optimized for the unique characteristics of the camera's sensor and processing engine. But if you plan on editing the images further, it can create problems if you try to work on files that have already had noise reduction applied. So I generally leave noise reduction to later stages of the processing and prefer to work with RAW. The in-camera noise reduction applies to JPGs and the JPG previews that are embedded in the RAW files, but it doesn't apply to the underlying RAW file.
All of the images on this page were shot in RAW. So that we're getting a better sense of the camera's performance rather than just how aggressive the noise reduction software is with the embedded previews, the versions here are rendered from underlying RAW data and discard the previews generated in-camera.
They've been lightly processed in Lightroom, mostly bumping up the contrast a little, some white balance tweaks, and, with some, adding a little extra vibrancy. I've not added any extra noise reduction but have left the default Lightroom setting of 25 on the color noise slider; zeroing that out does have some pretty ugly results. But obviously, there's a lot of room to further tweak the noise reduction results, whether in Lightroom's built-in functionality with applying the luminosity slider or the built-in features of a different RAW processor, or with a dedicated noise reduction app like Noise Ninja or Dfine.
Side-by-Side ISO 6400 through 12800
Here are some side-by-side examples at ISO 6400 through ISO 12800. They were taken on a tripod so a to keep the scene consistent, although there's obviously some movement in the clouds and water between shots. They were taken with the P setting with manual ISO settings using the mobile app to trigger.
You can click on each image to open a full-size version and use the link in each caption to download the original RAW (.arw) file.
Here's another short series. These were taken hand-held, so the alignment isn't perfect, but they're useful to complement the shots above because they have more and different color tones.
High-ISO Images Taken with the Sony RX0
You can click on each image for a full-resolution version and use the links in each caption to download the corresponding original RAW (.arw) version.
How to Access the RX0's Highest ISO Settings
If you use the Auto ISO setting on the camera, you'll get a maximum ISO of 6400. If you want to access the one options above that--8000, 10000, and 128000--you need to select them manually. While Sony's marketing specs say that there's a way to adjust the maximum ISO ceiling used in the Auto ISO feature, that's not true with the current firmware (v. 2.00)--but you can adjust the minimum shutter speed.
For such a tiny camera, the RX0 has remarkably good image quality. While still a small sensor, it's nevertheless considerably larger than the sensors in similarly-sized miniature cameras. And that extends to its high-ISO photos. While it has nothing like the low-light performance of its full-frame siblings like the a7r iii and a7 iii, of course, it creates quite usable images all the way up to ISO 12800.
Up through ISO 3200, the results are excellent and I'm more than happy using images even at ISO 3200 in everyday shooting. Once you get beyond that, the noise grain, dynamic range, and color rendition start noticeably deteriorating, but it never really drops of a cliff like it can with some other cameras, even at ISO 12800. And that, in itself, is impressive, because even with cameras with larger APS-C sized sensors, the results above ISO 3200 can become problematic very quickly.
Something that would make the RX0 an even better performer in low-light conditions would be a faster lens; it has a relatively slow f/4 fixed-aperture. Bringing that down to f/2.8 or even faster would be a welcome improvement. (Somewhat related, it would also be nice to have longer exposures than the current limit of 1/4 second.)
Overall, I'm impressed with the RX0's high-ISO performance without being blown away by it. The results are quite good, especially for a camera this tiny.
More on the RXO
Where to Buy
I bought mine at B&H Photo.
- Obviously, there are also many differences with the Alpha line. Smaller sensor, fixed lens, etc. I'm referring more to its pedigree, menu system, and overall approach than specific features. ↩