Summary
- The Fujinon XF400mmF4.5 R LM OIS WR is a 400mm prime super-telephoto lens for the Fujifilm X system, offering a 609mm full-frame-equivalent field of view.
- It weighs approximately 1,245g, features 5.5 stops of optical image stabilization and weather sealing at 20 points.
- With the XF1.4X and XF2X teleconverters, it reaches 853mm and 1,219mm full-frame equivalents, respectively.
- Availability is expected in mid-September at $3,199.95, approximately €2,755.02 using the ECB reference rate from September 3, 2026.
- Optical design for detail at long distances
- Fast autofocus and 5.5-stop stabilization
- Built for demanding conditions
- Up to a 1,219mm equivalent with teleconverters
- How it compares with the XF500mmF5.6
- Official video
- Availability and price
- No Fujifilm X-T6 was announced
- What we think
- Frequently asked questions
Fujifilm is expanding its X Series with the Fujinon XF400mmF4.5 R LM OIS WR, a 609mm-equivalent prime super-telephoto lens that combines an F4.5 maximum aperture, a 1,245g weight and 5.5 stops of optical image stabilization.
The company officially announced the new lens on September 4, 2026 for its APS-C X Series mirrorless cameras. With a 400mm focal length and an F4.5 maximum aperture, it is primarily aimed at wildlife, bird, motorsport and other fast-moving or distant subjects.
The announcement matters because it expands Fujifilm’s range of XF prime super-telephoto lenses and places the new model between the XF200mmF2 R LM OIS WR and the XF500mmF5.6 R LM OIS WR. Its key proposition is the balance of reach, speed and portability: the XF400mmF4.5 weighs approximately 1,245g without caps and hood, while offering a brighter maximum aperture than the XF500mmF5.6.
Optical design for detail at long distances
The optical construction comprises 21 elements in 14 groups, including two Super ED and four ED elements. Fujifilm says the design is intended to suppress chromatic aberration, a major challenge in super-telephoto lenses, while maintaining high sharpness and contrast across the frame.
The F4.5 aperture enables faster shutter speeds than a slower super-telephoto lens, which is critical when a subject moves unpredictably or the light level drops. At the same time, shallow depth of field and compressed perspective help separate the subject from the background, whether it is a bird in flight or a vehicle on a racetrack.
Fast autofocus and 5.5-stop stabilization
Fujifilm uses an internal focusing system so the focusing group remains small and light. It is driven by a linear motor designed for fast, quiet and precise autofocus. For photographers tracking birds, aircraft or sports action, the practical benefit is a shorter time to acquire focus and better response to abrupt changes in direction.
Focus Control buttons sit near the front of the barrel, alongside a mode selector for AF-L, PRESET and AF, plus Focus Preset for instantly returning to a stored distance. A focus limiter restricts the search range to subjects five metres away or farther, speeding operation at races or positions where subject distance is relatively predictable.
Optical image stabilization is rated at up to 5.5 stops under CIPA pitch-and-yaw testing. It does not remove the need for a fast shutter speed when the subject itself is moving, but it reduces camera shake and makes handheld composition easier, which is particularly useful at a 609mm-equivalent focal length.
Built for demanding conditions
The lens barrel is weather sealed at 20 points and designed to operate at temperatures down to -10°C. The front element has a fluorine coating that repels water and dirt. Fujifilm also says it reduced the diameter, length and thickness of individual barrel components and redistributed the optical elements for better balance, preventing excessive weight from gathering at the front.
These choices directly affect field use. A super-telephoto lens for wildlife or sports may remain on the camera for hours or move constantly between positions. The difference is determined not only by overall weight, but also by how smoothly the combination balances while framing and tracking a moving subject.
Up to a 1,219mm equivalent with teleconverters
The XF400mmF4.5 is compatible with the Fujinon XF1.4X TC WR and XF2X TC WR. With the 1.4x teleconverter, focal length becomes 560mm, equivalent to 853mm in 35mm format. With the 2x it reaches 800mm, equivalent to 1,219mm. This allows photographers to extend reach substantially without changing lenses, with the expected loss of maximum aperture that accompanies teleconverter use.
How it compares with the XF500mmF5.6
The XF500mmF5.6 R LM OIS WR remains the option with greater native reach: 500mm, or a 762mm full-frame equivalent, at approximately 1,335g. The new XF400mmF4.5 is 100mm shorter, but around 90g lighter and two-thirds of a stop brighter. This makes it more attractive when shutter speed, tracking fast action and a slightly wider field of view are the priorities.
By contrast, the XF500mmF5.6 keeps the advantage when maximum reach without a teleconverter is essential. The two lenses are not simple variations of the same product; they offer different balances of speed, angle of view and working distance. More details about the XF500mmF5.6 are available in PTTL’s earlier coverage.
Official video
Availability and price
The Fujinon XF400mmF4.5 R LM OIS WR is expected to become available in mid-September 2026. The official US suggested retail price is $3,199.95. Using the latest European Central Bank daily reference rate available before this article was prepared, dated September 3, 2026 — €1 to $1.1615 — that converts to approximately €2,755.02. This is a currency conversion, not an official Greek retail price.
More information is available on the official Fujinon XF400mmF4.5 R LM OIS WR product page.
No Fujifilm X-T6 was announced
Fujifilm’s official material dated September 4 concerns the XF400mmF4.5 R LM OIS WR and does not include a Fujifilm X-T6 announcement. Any information linking the lens to an unannounced camera body remains unconfirmed and is not an official company specification or announcement.
What we think
The XF400mmF4.5 fills a meaningful gap in the Fujifilm X Series. It offers a brighter maximum aperture and slightly lower weight than the XF500mmF5.6 without giving up the extreme reach required for birds, wildlife and sports. Its price clearly places it in the professional category, but teleconverter compatibility and 5.5-stop stabilization create a particularly versatile package for photographers who regularly work with distant, fast-moving subjects.
Frequently asked questions
What focal length does the Fujifilm XF400mmF4.5 provide?
The lens has an actual focal length of 400mm and provides an angle of view equivalent to a 609mm lens in 35mm format on Fujifilm X Series APS-C cameras.
How much does it weigh and how much stabilization does it offer?
It weighs approximately 1,245g without caps and hood and offers up to 5.5 stops of optical image stabilization under CIPA testing.
Is it compatible with teleconverters?
Yes. With the XF1.4X TC WR it reaches 560mm, equivalent to 853mm, while the XF2X TC WR extends it to 800mm, equivalent to 1,219mm.
When will it be available and how much will it cost?
Availability is expected in mid-September 2026 at an official US suggested retail price of $3,199.95. That converts to approximately €2,755.02 using the ECB reference rate from September 3, 2026, but it is not an official Greek retail price.
