SIGMA BF Unveiled – A New Type of Camera?

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On 28/02/2025

Sigma has introduced another impressively designed camera – the SIGMA BF. This new compact full-frame camera redefines how a camera interacts with us. The BF offers an innovative, modern, minimalist operational experience designed to simplify workflow to the core of camera use. The new camera features a 24-megapixel full-frame sensor housed in a body made from a single block of aluminum. With 230GB of internal storage, it doesn’t include a memory card slot, and the input/output interface is reduced to a single USB-C port. It also supports 6K video capture, but this camera is more about the experience than the specification list. Let’s explore further.

In a world of conservative camera designs, where most cameras still adhere to the traditional philosophy established by 35mm film cameras, SIGMA’s innovation is truly appreciated. The company has a strong tradition of innovative design and user experience. While it may not win over the masses, this approach challenges the rest of the market, shaking things up and prompting us all to reconsider what could have been.

What exactly is the SIGMA BF?

One could try to categorize the SIGMA BF as a compact full-frame camera. It fits comfortably into the premium product category with its sleek, all-metal aluminum body. The absence of a mechanical shutter may be a bit much for hardcore photographers, but it’s becoming a more common feature in hybrid cameras. However, the BF doesn’t fit neatly into any of the usual categories, especially given that it has neither a microphone nor a headphone jack. Like its direct predecessor, the SIGMA fp, this camera occupies a unique segment of its own.

SIGMA BF 5-axis machining process. Image credit: SIGMA

The Bare Specifications

While the SIGMA BF’s spec list may not be the absolute top of the line, it is still quite impressive, particularly considering its compact size. The camera can record 6K video at up to 30P and FHD video at up to 120P. It supports HEVC and includes SIGMA’s L-Log. No other settings have been revealed yet, and given the unique nature of this camera, it’s hard to predict exactly what else it may offer.

At the core of the SIGMA BF is a 24-megapixel BSI CMOS sensor, equipped with PDAF sensors, which should provide solid autofocus performance for both still images and video capture. Of course, this will need to be tested in real-world conditions. The sensor does not feature mechanical stabilization, but the camera offers electronic stabilization for video.

Innovative User Experience

The SIGMA BF features a somewhat “closed-loop” design, with almost no ports, doors, or slots. The camera uses 230GB of internal memory, taking inspiration from brands like Hasselblad, Leica, and Zeiss. However, unlike them, SIGMA completely omitted the memory card slot, meaning no direct backup can be made on the go. The battery compartment also doubles as the battery door to minimize moving parts. The rear control buttons are touch-sensitive, haptic panels with a metal dial on top. Controls have been simplified to the essentials, with a deeper menu available if you wish to explore further. The SIGMA BF focuses on an intuitive, streamlined operation driven by decisive design choices.

SIGMA BF control layout. Image credit: SIGMA

The Glass Ceiling

Whether it’s the SIGMA BF or any other full-frame compact, the physics remain straightforward: the larger the sensor, the larger the image projection circle, and consequently, the larger the lens. When calculating the weight and bulk of a new compact, the lens must be considered. SIGMA has paired the BF with a series of silver “i” lenses to match its sleek design. These lenses not only look fantastic but also enhance the desired intuitive operation, particularly with the aperture ring. However, no lens will maintain the same flush design or remain pocketable when attached to the camera.

SIGMA BF body and dedicated silver lenses. Image credit: SIGMA

Who Is It For?

As previously mentioned, the SIGMA BF doesn’t easily fit into any common segment. If I had to categorize it, I’d say SIGMA has launched a new subsegment of premium compact cameras. The Japanese manufacturer has adopted highly modern practices, creating a user experience that is closer to smartphones than to traditional cameras. Several manufacturers have tried to walk this path before— the Zeiss ZX1 was likely the closest. Hasselblad’s X1D and its predecessors also incorporated innovative features, as have others. All have created impressive cameras, with some even achieving significant success. However, SIGMA seems to have fully embraced this path with the BF, making it a unique camera that may appeal to a new generation of smartphone upgraders, design enthusiasts, and anyone looking for a visually striking camera.

Alternatives

Several cameras on the market may challenge the SIGMA BF, at least in some areas. Its closest competitor for the uniquely designed compact camera category is its SIGMA sibling – the fp (or the 60-megapixel fp-l). This pair offers an interesting design with some functional advantages, though they can’t quite match the exquisite monoblock aluminum shell of the BF.

The Panasonic LUMIX S9 also competes with a comparable feature set and a more colorful design. While it isn’t built to the same standards, this probably helps it on the affordability front. Other alternatives may be found in the fixed-lens category, such as the Leica Q series or recent FUJIFILM X100 models.