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(Pocket-lint) - The Sony Cyber-shot RX100 III has been announced, boasting a new 24-70mm f/1.8-2.8 (equivalent) lens and new built-in electronic viewfinder. It arrives alongside the original and second-generation RX100 models to sit at the top of the trio as the most fully featured all-in-one compact from the RX-line yet.

Measuring a few centimetres wider than the MkII model, the RX100 MkIII's 101.6 x 58.1 x 41.0mm dimensions maintain the camera's small size despite the boost in features. The new lens means a faster available aperture range throughout, although the top-end focal length is far less than the 100mm equivalent in the older models.

Key to the RX100 M3 is a pop-up 0.39-inch, 1,440k-dot OLED viewfinder. Flick a side-mounted switch and it pops into position from within the body, completed by tugging the rear optic out for it to become a fully functional finder. Very cool.

On the rear the 3-inch, 1,229k-dot WRGB LCD screen is now mounted on a 180-degree tilt-angle bracket. Sony has got in on the selfie craze by enabling the screen to tilt all the way up into a vertical position. But it's still shunned the idea of a touchscreen in the same way the earlier models failed to feature.

Paired with the same 20.1-megapixel 1-inch back-illuminated sensor, the RX100 MkIII adds the latest Bionz X image processor for the ultimate in image quality. Fast autofocus, a built-in neutral density filter and 50Mbps 1080p movie mode add to the burgeoning feature set.

We've been using the Cyber-shot RX100 III ahead of the official announcement. For more detail on what we made of the camera, read our first impressions below:

READ: Hands-on: Sony Cyber-shot RX100 III review

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The last part of the puzzle is price and release date. At the time of writing both are unknown, but our Spidey senses suspect a £799 launch price next month. It's a lot of money for a little camera - but don't be fooled by its looks, there's a whole lot of camera tucked into that metal chassis. Sony may just have well introduced the king of the compacts to the market.

Writing by Mike Lowe. Originally published on 15 May 2014.