When I’m traveling, I like to take photos in low light. Whether it’s a smoky morning market, a quiet but pretty street at night, or the inside of a grandly decorated cathedral or mosque, there are plenty of times that the scene isn’t going to be picture-perfect bright sunshine. So one of the things I’m particularly interested in when testing out cameras is how they perform in low light. That generally comes down to a combination of lens speed (ie. maximum aperture), image stabilization, and high ISO performance.
- 1” Stacked back illuminated Exmor RS CMOS Sensor
- 24mm1 F4 ZEISS Tessar T* lens delivers high-resolution images
- BIONZ X image processor
- Anti-distortion shutter of up to 1/32000 sec.
The Sony RX0 is an unconventional choice as a travel camera, and it’s not without some issues. But it’s also a surprisingly powerful camera. While it looks for all the world like a GoPro competitor, it’s waterproof, and it boasts an eclectic mix of high-end video features. Yet 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, it’s more like a miniaturized addition to Sony’s impressive Alpha line of cameras than a GoPro. 1
I’ve posted a more general collection of photos taken with the Sony RX0 separately. I’ve also been putting the RX0’s high-ISO capabilities to the test, and that’s what I’m focusing on here. 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 its maximum is ISO 12800.1 I’m focusing here on the upper end, from ISO 3200 through ISO 12800. And these are with its still images; I’ll tackle video separately. I’ve included some real-world examples below to give a sense of how it performs.
Table of Contents
In-Camera Noise Reduction
Like other Sony cameras, the RX0 has in-camera noise reduction, and it actually works quite well because 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 DxO’s DeepPrime and Topaz Labs’ DeNoise AI.
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 as 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 ISO 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 ultra-compact 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
Fixing Image Quality Problems in Editing
The general rule of thumb in photography is that it’s better to get the shot right at the time of capture rather than trying to fix it later. That’s a great aspiration, but it’s not always possible to do if you’re shooting in especially challenging conditions or bumping up against limitations or flaws in gear, conditions, or technique.
But it’s worth mentioning that there are some excellent tools available to help address common image quality issues with digital images. And they’re getting better and better all the time as the power of AI ramps up. They can deal remarkably well with anything from sensor issues like high-ISO image noise to lens issues like distortion, softness, vignetting, and chromatic aberration. (Note: I’m focusing here on corrections related to image quality, not image enhancement tools—that’s a different kettle of fish.)
All-round image processing apps like Lightroom Classic and Capture One have solid tools built in that are very good places to start. But it’s also possible to take it much further with more specialized tools. If you shoot in challenging conditions regularly and find room for improvement in the image quality coming out of the camera, these might well be worth a look (and they have free trials). Some are stand-alone apps; some integrate into image editing suites such as Lightroom Classic.
UPDATE: In April 2023, Adobe released an update to Lightroom Classic that added new AI-powered noise reduction for RAW files. It’s a powerful tool that rivals some of the dedicated apps below. If you’re already using Lightroom Classic for your image editing and organization, it’s well worth trying out—look for the Denoise tool under the Detail panel.
Fixing Image Noise & High ISO Artifacts
- DxO PureRAW 3. Like Lightroom Classic’s Denoise tool, it only works on RAW files. But since was updated to version 3, it has become my go-to app for this kind of thing. I’m consistently amazed at how it can rescue photos with otherwise dodgy image quality from noise. It can also help with lens distortion, lens vignetting, and lens softness.
- DxO DeepPrime. This is the noise-only offering using the same denoising technology as PureRAW.
- Topaz Labs’ DeNoise AI. This is another excellent option for specialized denoising. It works alongside Lightroom or as a standalone app.
Fixing Lens-Related Optical Issues
- DxO PureRAW. Again offers an impressive suite of automatic fixes that are applied before you start editing the images.
- DxO ViewPoint. Correcting for lens distortion and geometry skews. Lightroom Classic and Capture One also have excellent built-in tools for this.
- Topaz Labs Sharpen AI. In addition to standard unsharp tools, it includes focus correction and shake reduction.
- 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.
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