Sony RX100 III Review: The Generation That Added a Viewfinder

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The Sony RX100 III is where the RX100 series changed direction. Sony kept the one-inch sensor and genuinely pocketable body, but added a retractable electronic viewfinder, a brighter 24–70mm-equivalent lens, a screen that could face forwards and a built-in neutral-density filter.

Those upgrades made the camera more useful for deliberate photography and casual video, but they also shortened the zoom compared with the first two models. Today, the RX100 III can still be an attractive used compact—provided its price, condition and limitations make sense.

Why the RX100 III was a major step

The first RX100 established the basic idea: strong image quality in a pocketable camera. The RX100 II added a tilting screen, Wi-Fi and an accessory shoe. The third generation redesigned the lens and made an eye-level viewfinder part of the camera itself.

That combination is the reason this model remains interesting. It offers a 20.1-megapixel one-inch Exmor R CMOS sensor, RAW capture, a 24–70mm-equivalent f/1.8–2.8 Zeiss lens and a pop-up OLED viewfinder in a body weighing about 290g with battery and memory card.

If maximum reach matters more than lens brightness, compare it with our Sony RX100 II review. That model reaches 100mm equivalent, whereas the RX100 III stops at 70mm.

Image quality from the one-inch sensor

The sensor is similar in principle to the one used in the RX100 II, but the BIONZ X processor and redesigned lens shape the overall result. In good light, the camera can produce detailed photographs with pleasing colour and enough flexibility for cropping and printing.

RAW files are the better choice when you expect to adjust highlights, shadows or white balance. JPEGs are convenient and can look good straight from the camera, but aggressive noise reduction at higher ISO settings can soften fine textures.

The sensor is much larger than those in traditional pocket cameras, though smaller than Micro Four Thirds or APS-C. Low-light quality is good for the size, not unlimited. The bright lens helps keep ISO lower, especially because it remains at f/2.8 at the 70mm-equivalent end rather than falling to f/4.9 like the earlier 28–100mm lens.

The 24–70mm f/1.8–2.8 lens

The RX100 III’s lens is its most important change. Starting at 24mm equivalent gives a wider view for interiors, architecture, groups and landscapes. The f/1.8–2.8 aperture range is useful in poor light and offers more control over background separation than a slower compact zoom.

The trade-off is obvious: 70mm is noticeably shorter than 100mm. It remains suitable for everyday portraits and closer details, but gives less reach for distant subjects. Buyers should decide whether they value brightness and width more than telephoto range.

Optical SteadyShot reduces blur caused by hand movement. It does not stop a moving subject, so appropriate shutter speed still matters for people, pets and action.

The built-in electronic viewfinder

The retractable 1.44-million-dot OLED viewfinder is the feature that most clearly separates the RX100 III from its predecessors. It gives a stable eye-level way to compose, helps in bright sunshine and makes the camera feel more like a traditional photographic tool.

It is small by modern standards and requires a two-stage deployment: the finder pops up, then its eyepiece must be pulled out. Users sometimes forget that second step. Even so, having a viewfinder inside such a small body is far better than relying exclusively on the rear screen.

When buying used, deploy and retract it repeatedly. Make sure the image appears reliably, the dioptre adjustment works and the eyepiece does not feel loose.

Tilting screen and handling

The three-inch screen tilts upwards by 180 degrees and downwards by about 45 degrees. It is useful for low angles, overhead shooting and self-framing. The screen is not touch-sensitive, so focus points and settings are controlled through the physical buttons and menus.

The body is solid and impressively small, but that size also creates compromises. The front is smooth, the buttons are compact and the menu system is dense. A wrist strap or small grip is sensible. The lens control ring and rear wheel provide useful manual control once the camera is configured to suit the photographer.

Built-in ND filter

The RX100 III includes a three-stop neutral-density filter. Think of it as sunglasses for the lens: it reduces the light reaching the sensor without changing the scene’s colour. This makes it easier to use a wide aperture in bright conditions or select a slower shutter speed for intentional movement.

For example, the filter can help preserve f/1.8 outdoors when you want more background blur. It can also help smooth moving water, although three stops do not replace a stronger external filter in very bright conditions. Understanding the exposure triangle makes this feature far more useful than leaving every decision to Auto mode.

Autofocus and burst shooting

The RX100 III uses contrast-detection autofocus. It is responsive enough for travel, street scenes, family photographs and general subjects in decent light. It is less dependable with erratic movement and cannot provide the advanced tracking found in newer RX100 generations or modern mirrorless cameras.

The camera can shoot at up to 10 frames per second in the appropriate mode, but the headline rate does not describe buffer limits or continuous focus performance. It can catch short moments; it is not designed as a miniature sports body.

Video capabilities

The camera records Full HD rather than 4K. XAVC S recording at up to 50Mbps was a meaningful improvement, and the camera can create clean, detailed 1080 footage when exposure and focus are controlled well.

The front-facing screen is convenient for self-recording, but the camera lacks a microphone socket. Audio therefore depends on the built-in stereo microphones or a separate recorder. It also lacks modern real-time tracking and the thermal, battery and interface improvements of newer creator-focused cameras.

For occasional travel films or family clips, the video remains useful. For a video-first purchase, later equipment is the more sensible direction.

Wi-Fi and NFC

Wi-Fi and NFC allow wireless transfer and remote operation with compatible devices. Because mobile operating systems and Sony applications have changed, do not assume the experience will be as seamless as a new camera. Check current app compatibility with your own phone before treating wireless transfer as a decisive feature.

What the RX100 III does well

• Detailed RAW and JPEG files from a one-inch sensor
• Bright 24–70mm-equivalent f/1.8–2.8 lens
• Built-in retractable electronic viewfinder
• Screen that tilts for low, high and front-facing composition
• Integrated three-stop ND filter
• Optical image stabilisation
• Small, well-built body with manual controls
• Useful Full HD XAVC S recording

Where its age shows

• No 4K video
• No touchscreen
• No microphone input
• Contrast-detection autofocus is dated
• 70mm maximum reach is shorter than the earlier 100mm lens
• Small controls and limited grip
• Wireless compatibility may be awkward with current phones
• Used examples may have wear in the retracting lens, EVF or screen mechanism

Buying a used RX100 III

Start with the retracting lens. It should extend, zoom and close smoothly without grinding, hesitation or error messages. Take photographs at several focal lengths and apertures, then inspect the files at full size for dust, uneven blur or decentring.

Test the pop-up viewfinder repeatedly, including its eyepiece and dioptre adjustment. Move the screen through its complete range while watching for flickering. Check every button, both control rings, the flash, USB charging, HDMI connection and Wi-Fi startup.

Inspect the battery compartment and ports for corrosion. The NP-BX1 battery may have lost much of its original capacity, so a replacement should be included in the budget. Heavy impact marks around the lens barrel are a warning sign.

Sony’s official RX100 III specification page confirms the model’s features. Manuals and available downloads are listed on the Sony support page.

What you need besides the camera

A dependable SD card, spare NP-BX1 battery, wrist strap, small case and cleaning cloth are the essentials. For long exposures, group photographs or deliberate landscapes, a stable support is useful. Our Benro Rhino tripod review covers a strong travel option, although the RX100 III is light enough for a much smaller support when portability comes first.

The 30-Second Decision

Buy it if you want a genuinely pocketable stills camera with a bright lens, RAW capture, a built-in viewfinder and a tilting screen, and you find a clean example at a sensible price.

Skip it if you need long zoom reach, modern autofocus, a touchscreen, a microphone input or 4K video. Also skip it when a later RX100 is available for only a modest amount more.

Final verdict

The Sony RX100 III is the point where the series became much more complete. Its viewfinder, brighter lens, front-facing screen and ND filter provide practical advantages rather than decorative specifications.

It is still constrained by its age and by the fixed 24–70mm lens, but it can make an excellent small stills camera at the right used price. Condition matters greatly, so test every retracting and moving component before buying.

Check Sony RX100 III availability on Amazon