Is Sony's medium format camera with a curved sensor almost ready?

Is Sony's medium format camera with a curved sensor almost ready?
(Image credit: Microsoft)

Is a medium format Sony camera with a curved sensor on the way? Whether or not such a camera ever makes it to market, Sony's research and development teams are certainly designing one. 

A fresh batch of patents reveals Sony lenses formulas for a medium format camera with a curved sensor – and we know that Sony has been high on curved sensor technology dating back to 2014. Could this be the company's play to take the lead on revolutionary new tech, and also challenge the best medium format cameras at the same time?

The lens designs discovered by Sony Alpha Rumors detail five lenses, most of them in the telephoto range: 

387mm f/2.8 (240mm f/1.7 in full frame terms)
323mm f/2.8 (200mm f/1.7 in full frame terms)
258mm f/2.8 (160mm f/1.7 in full frame terms)
161mm f/2.8 (100mm f/1.7 in full frame terms)
84mm f/2.9 (52mm f/1.7 in full frame terms)

So what exactly is a curved image sensor? As the name suggests it's a sensor that, rather than the traditional flat design, mimics the design of the retina in the human eye – and this, according to Sony when it revealed its technology in 2014, results in a simpler lens system that is 1.4x more sensitive at the center and 2x more sensitive at the edges.

According to a report by IEEE on that original presentation by Kazuichiro Itonaga, a device manager with Sony's R&D Platform: 

"A curved CMOS sensor has a few advantages over a planar sensor, Itonaga said. Because of the geometry, it can be paired with a flatter lens and a larger aperture, which lets in more light. Photodiodes at the periphery of a sensor array will be bent toward the center, which means light rays will hit them straight on instead of obliquely. What's more, the strain induced on a CMOS sensor by bending it alters the band gap of the silicon devices in the sensor region, lowering the noise created by 'dark current' – the current that flows through a pixel even when it is receiving no external light."

So, is such a sensor realistically going to emerge? It's no exaggeration to say that this is the next frontier of camera technology; Sony patented its curved medium format sensor in 2017, followed by Nikon patenting a curved full-frame sensor, and both Canon and Microsoft are also developing the idea. So yes, there is officially an arms race taking place.

The fact that Sony has gone so far as to develop lenses is an interesting revelation. If it had simply stuck with the sensor, that might suggest that it is happy to selling medium format sensors to Fujifilm and Hasselblad. However, given that it is now designing optics as well, you might connect the dots and predict that a full system is in the works…

Read more: 

The best medium format camera in 2020: big sensor cameras for experts and pros
The best Sony camera in 2020: from Cyber-shots through to Sony Alphas
Fujifilm GFX 100 review

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James Artaius

The editor of Digital Camera World, James has 21 years experience as a journalist and started working in the photographic industry in 2014 (as an assistant to Damian McGillicuddy, who succeeded David Bailey as Principal Photographer for Olympus). In this time he shot for clients like Aston Martin Racing, Elinchrom and L'Oréal, in addition to shooting campaigns and product testing for Olympus, and providing training for professionals. This has led him to being a go-to expert for camera and lens reviews, photo and lighting tutorials, as well as industry news, rumors and analysis for publications like Digital Camera MagazinePhotoPlus: The Canon MagazineN-Photo: The Nikon MagazineDigital Photographer and Professional Imagemaker, as well as hosting workshops and talks at The Photography Show. He also serves as a judge for the Red Bull Illume Photo Contest. An Olympus and Canon shooter, he has a wealth of knowledge on cameras of all makes – and a fondness for vintage lenses and instant cameras.