A world’s first, the 35-50mm f/1.4 FE:

A new rumor circulating on Chinese social media platform Weibo hints at a groundbreaking full-frame zoom lens set to arrive in 2026: a 35–50mm f/1.4. Reportedly developed by a well-known Chinese manufacturer—possibly Viltrox—this would mark the first-ever full-frame autofocus zoom lens from a Chinese brand.

If true, this lens could steal the spotlight by offering an f/1.4 constant aperture—surpassing the current title holder, the Sigma 18–35mm f/1.8, as the fastest zoom lens available. While the 35–50mm range is relatively narrow, such a lens could effectively replace two key primes: the Sony 35mm f/1.4 GM and the Sony 50mm f/1.4 GM. It’s an ambitious move that, if real, would signal a bold leap forward for Chinese lens makers on the global stage.

One more thing:

It is reported that several Chinese optical brands are actively working on autofocus zoom E-mount lenses, with current reports pointing to at least five in development. The Weibo account reports that according to a senior executive from one Chinese manufacturer, a major milestone is on the horizon. By 2026, we can expect a wave of new autofocus zoom lens releases from various Chinese brands. These lenses—developed through in-house innovation, strategic imports, or acquisitions—represent the culmination of years of progress in optics, including advancements in glass formulation, autofocus algorithms, coatings, and motor technology.

And now let me know in the comment system if you would actually be interesting in owning a 35-50mm f/1.4 FE lens!

Folks, it’s time to get serious about the next generation of new Alpha cameras. Over the past few weeks, I’ve had several conversations with sources both familiar and new. And they all have the same leitmotif: no one has heard of a possible new Sony A7sIII successor. Now, I’m not omniscient, so maybe Sony has been keeping this super secret and the As7IV will be announced tomorrow :)
But realistically, I don’t think there will be an A7sIV anytime soon…. and now I’m wondering if the “S” series won’t be discontinued. I see the possibility that the future FX3II will be the official upgrade for the current FX3 and the A7sIII. What do you think about that scenario?

BIG Alpha camera teaser:
All those sources shared some reliable and some unconfirmed info about three kind of cameras: Sony A1II, Sony A7V and a “surprise” model. Not saying yet they are coming very soon…but certainly within 6-8 months. And you can expect me to share some info about that in the next days. If you have more info about the next Sony cameras and lenses you can share send me a message using this contact box or at sonyalpharumors@gmail.com. Thanks!

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Before we get into this speculative bit about the Sony medium format system I kindly invite you to subscribe my new Youtube channel (click here). And now let’s get onto it:

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It’s about time to talk about facts, myths and rumors about the possible future Sony medium format system. In my video above I explain everything we know so far and below you can find some facts and rumors. It’s important to disclose ASAP that there is no hard fact yet that convinced me the medium format system is coming any time soon. But there is some increasing background noise, and some patents that gives us some breadcrumps on how such a system might look like:

Sony statements on Medium Format:

Back in 2017 Sony manager said that at least for now they rule out the possibility to launch a medium format camera. The reason is that it takes a lot of time and resources to develop a new system with cameras, lenses and accessories. At the same time Sony they have all the necessary resources (knowledge and components) to make such a medium format camera if they would like to do it.

One image: Fuji GFX100s, Mamiya 7II and Sony A7rIV

But since 2017 may new patents have been published by Sony and here is a quick roundup:

Here is one of the many Sony f/2.8 medium format lens patents. In detail we got this:

• 387mm f/2.8 (lens length: 679mm) – in Full Frame terms this is a 240mm f/1.7 (using online calculator)
• 323mm f/2.8 (lens length: 576mm) – in Full Frame terms this is a 200mm f/1.7
• 258mm f/2.8 (lens length: 380mm) – in Full Frame terms this is a 160mm f/1.7
• 161mm f/2.8 – in Full Frame terms this is a 100mm f/1.7
• 84mm f/2.9 (lens length: 123mm) – in Full Frame terms this is a 52mm f/1.7 (it would be 2cm longer than the Zeiss 50mm f/1.4 FE)

The extraordinary feature of those lens patents is that they are all designed for curved sensors. Sony patented some curved sensors design (example here). This includes also Full Frame curved sensors (example here). Some other company like for example CEA-LETI already displayed some working prototype (more about this here). While Sony already showed an image sample shot on a curved sensor back in 2014 (see here).

VLSI Symposia tipsheet (via ISW) explained better how this sensor works:

“Curved CMOS Image System: When light transmitted by a lens strikes a perpendicular target such as a CMOS image sensor, it forms a circle of light called an image circle. It’s difficult for a flat (planar) CMOS image sensor to deliver high image sensitivity at high resolution (highly scaled pixel pitch) because of the fundamental physical limit known as quantum efficiency. To break through that physical limit and to achieve higher sensitivity anywhere within the image circle at higher resolution, Sony built and will describe an imaging system that comprises a hemispherically curved, back-illuminated CMOS image sensor (BIS) and integrated lens. It doubles the sensitivity at the edge of the image circle while increasing sensitivity at its center by a factor of 1.4, with a 5x reduction of dark current (Jd) compared to a planar BIS. Moreover, a common problem known as lens field curvature aberration (Afc) is mitigated by the curved sensor itself, and so the curved BIS enables higher system sensitivity with a brighter lens with a smaller F number (Fn) than is possible with a planar BIS. In addition, by controlling the tensile stress of the BIS chip to produce a curved shape in the first place, the energy band-gap (Eg) is widened and a lower Jd is achieved. (Paper T2.1, “A Novel Curved CMOS Image Sensor Integrated with Imaging System,” K. Itonaga et al., Sony)“

Recent medium format Rumors:

The only rumor I got from solid sources says that Sony is working on a new kind of camera. But we shouldn’t get too excited about that wording. It could mean a new kind FF camera too. All other rumors are from anonymous sources and therefore at high risk of being B.S. The last two I got tell us this:

Posted on SAR on December 13:

Simultaneous announcement about curved sensor medium format camera development (2 cameras, 150mp and 200mp, 9-12 prime lenses, very expensive, to follow quickly)

Posted on SAR on December 13:

the medium format system Sony will release in 2 years has not curved sensor, its a new developed 200mp 54×36 sensor in a new mount, Sony will release an adapter to use E lenses (just they can say it had a lot of compatibility lenses cause the system will be released with only 3 primes) and will be a system without mechanical shutter with flash sync faster than anything in the market by far, its a system targeted for ultimate studio work

The business case for a Sony medium format system:

The Sony A1 and the Fuji GFX proved that people is willing to pay a lot of money for exciting cameras. In all those years of constant camera market decline only the high end stuff keeps selling. Sony might have been motivated to be bold and launch a MF system.

Wrap Up:

If patents are any indication for the direction Sony wants to go with their medium format system than we can assume this:

•  The sensor is 2.2x larger than FF with 53.5mmx 40mm size and 0,65 crop factor. This is larger than the current Fuji GFX sensor (44x30mm, 1.7 larger than FF and 0,79 crop)
• All these sensors are curved. This allows the lenses to be much smaller because they don’t need additional glass to correct for distortion. And it allows to get the same sharpness all across the frame. The f/2.8 (FF equivalent f/1.7) lenses are barely larger than Full frame f/1.4 primes.
• The patented lenses are all primes with f/2.8 aperture. This is equivalent to f/1.7 in Full Frame terms.

So you see, Sony seems to aim for a proper 645 sensor with curved sensor tech to beat the Fuji GFX system in terms of image quality while still maintaining a relatively compact lens system. The trade off is that such curved sensors are eventually going to be very costly to produce.

It’s all speculation for now, and patents are no proof for real stuff happening. But I hope that within the next few months we will finally learn more if Sony is serious about this. Maybe after reading this known sources can give me some more info about what’s going on with Sony’s medium format plan ;)

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