Fujifilm's New XF 400mm f/4.5 Offers 609mm-Equivalent Reach at Just 2.74 lbs

Fujifilm has announced the XF 400mm f/4.5 R LM OIS WR, a new super-telephoto prime lens for the X Series system. Designed primarily for wildlife, bird, sports, motorsports, and aviation photography, the lens provides a 400mm focal length, equivalent to 609mm on full frame, while weighing approximately 2.74 lb (1,245 g).

The lens combines an f/4.5 maximum aperture with optical image stabilization, a linear autofocus motor, weather resistance, and compatibility with Fujifilm's 1.4x and 2x teleconverters. Fujifilm is positioning it as a long-reach option that remains manageable enough for handheld shooting and extended periods in the field.

400mm Reach in a Relatively Compact Package

The XF 400mm f/4.5 R LM OIS WR has a native focal length of 400mm, providing framing equivalent to approximately 609mm on a full frame camera when used on Fujifilm's APS-C X Series bodies.

That amount of reach makes the lens particularly suitable for subjects that cannot easily be approached, including birds, wildlife, aircraft, motorsports, and athletes photographed from the sidelines.

Photographers who need additional reach can pair the lens with the Fujinon XF 1.4X TC WR, which extends the focal length to 560mm, equivalent to approximately 853mm on full frame.

The Fujinon XF 2X TC WR increases the focal length to 800mm, corresponding to approximately 1,219mm on full frame.

Teleconverter compatibility gives photographers a way to substantially increase reach without carrying a second super-telephoto lens.

Optical Design

The XF 400mm f/4.5 R LM OIS WR uses 21 elements arranged in 14 groups, including four ED elements and two Super ED elements.

The specialized glass elements are designed to reduce chromatic aberration, an important consideration for a super-telephoto lens where color fringing around high-contrast subjects can become especially visible.

The lens has a maximum aperture of f/4.5 and a minimum aperture of f/22. Its diaphragm uses nine rounded blades.

Minimum focusing distance is 108.3 in (275 cm), while maximum magnification is 0.16x.

Designed for Handheld Shooting

One of the notable features of the XF 400mm f/4.5 R LM OIS WR is its weight relative to the reach it provides. The lens weighs approximately 2.74 lb (1,245 g), excluding the lens cap and hood, and measures approximately 4.1 x 9.4 in (104 x 239.5 mm).

Fujifilm has also designed the optical layout to position the center of gravity closer to the camera body. This should help reduce the front-heavy feeling that can make large super-telephoto lenses tiring to use over extended periods.

That balance is particularly relevant for photographers tracking birds in flight, following athletes, or working in situations where constantly repositioning a tripod or monopod would be impractical.

5.5 Stops of Optical Image Stabilization

The lens incorporates optical image stabilization rated for up to 5.5 stops of correction under CIPA testing standards.

Stabilization becomes increasingly important at super-telephoto focal lengths because small camera movements translate into much more obvious movement within the frame. While a monopod or tripod may still be preferable for some assignments, optical stabilization should make handheld work more practical when mobility is important.

That could be particularly useful for wildlife trails, airshows, outdoor sporting events, and other situations where photographers may need to move rapidly between shooting positions.

Linear Motor Autofocus

Autofocus is handled by an internal focusing system driven by a linear motor. Fujifilm describes the system as fast and near-silent, with the focusing group moving internally.

Beyond conventional autofocus operation, the lens includes several controls designed for photographers working with fast or unpredictable subjects.

A focus preset function allows the photographer to store a predetermined focus position and return to it using the SET button. This could be useful when action is expected to occur repeatedly at a known distance.

A Focus Control Button near the front of the lens provides quick access to the function selected with the Focus Select Switch. Available options include AF-L, PRESET, and AF.

The lens also has a focus limiter that can be used when photographing subjects farther than 15 ft (5 m). Restricting the available focusing range can reduce the amount of distance through which the autofocus system needs to search.

Weather Resistance for Outdoor Use

The XF 400mm f/4.5 R LM OIS WR has 20 sealed points around its barrel to provide dust and weather resistance.

Fujifilm specifies operation in temperatures as low as 14 °F (-10 °C). The front element also receives a fluorine coating intended to repel water and make dirt and smudges easier to remove.

Those features are particularly relevant for the photographers this lens targets. Wildlife, bird, aviation, and sports photography frequently require working for long periods in dust, moisture, cold temperatures, and changing weather.

Key Specifications

• Lens: Fujifilm XF 400mm f/4.5 R LM OIS WR
• Mount: Fujifilm X mount
• Lens type: Super-telephoto prime
• Focal length: 400mm
• Full frame equivalent: 609mm
• Maximum aperture: f/4.5
• Minimum aperture: f/22
• Optical construction: 21 elements in 14 groups
• Special elements: Four ED and two Super ED elements
• Diaphragm: Nine rounded blades
• Aperture increments: 1/3 EV
• Minimum focusing distance: 108.3 in (275 cm)
• Maximum magnification: 0.16x
• Optical image stabilization: Up to 5.5 stops
• Autofocus motor: Linear motor
• Focusing system: Internal focusing
• Focus preset function: Yes
• Focus Control Button: Yes
• Focus limiter: Yes, including operation for subjects beyond 15 ft (5 m)
• Weather sealing: 20 sealed points
• Minimum specified operating temperature: 14 °F (-10 °C)
• Front element coating: Fluorine
• Dimensions: 4.1 x 9.4 in (104 x 239.5 mm)
• Weight: Approximately 2.74 lb (1,245 g), excluding lens cap and hood
• Filter size: 95 mm
• With 1.4x teleconverter: 560mm, approximately 853mm full frame equivalent
• With 2x teleconverter: 800mm, approximately 1,219mm full frame equivalent
• Included accessories: Front lens cap FLCP-95, rear lens cap RLCP-001, lens hood, lens pouch, tripod collar foot, and shoulder strap

Why It Matters for Photo and Video Creators

The main attraction of the XF 400mm f/4.5 R LM OIS WR is its combination of reach and portability.

A 609mm full frame equivalent focal length places it firmly in wildlife, bird, aviation, motorsports, and field-sports territory. At the same time, its 2.74 lb weight makes handheld operation considerably more practical than it would be with a much larger long-lens setup.

That matters because these types of photography often reward mobility. Wildlife photographers may spend hours walking between locations or tracking moving animals. Bird photographers frequently need to follow subjects in flight. Sports photographers may work up and down a sideline rather than remain in one fixed position.

The 5.5-stop stabilization system reinforces that approach by reducing dependence on support equipment. A tripod or monopod may still be useful for long sessions, but the ability to work handheld gives photographers more freedom to react as subjects move.

Teleconverter compatibility also broadens the lens' usefulness. The option to extend the focal length to 560mm or 800mm gives wildlife and bird photographers considerably more reach without requiring another large prime lens.

For video creators, the stabilization system and linear-motor autofocus could be especially useful. Camera movement becomes extremely obvious at 400mm, making optical stabilization an important tool when footage needs to be captured without a fully locked-down support system.

Near-silent autofocus also matters for video when microphones are positioned close to the camera. The focus preset and limiter functions could additionally prove useful for subjects moving through predictable positions, including sports, wildlife, and motorsports.

Pricing and Availability

The Fujifilm XF 400mm f/4.5 R LM OIS WR carries a manufacturer's suggested retail price of $3,199.95 in the United States and $3,899.99 CAD in Canada. Fujifilm says the lens is expected to be available in mid-September 2026.

The lens is available for preorder now.

Conclusion

The XF 400mm f/4.5 R LM OIS WR gives Fujifilm X Series photographers another dedicated option for subjects that demand substantial reach. Its combination of a 400mm focal length, 609mm full frame equivalent framing, f/4.5 maximum aperture, 5.5-stop stabilization, linear-motor autofocus, weather sealing, and relatively low 2.74 lb weight makes it especially relevant for wildlife, bird, sports, aviation, and other outdoor photographers who need to remain mobile.

Video creators also stand to benefit from the quiet internal autofocus system, stabilization, focus controls, and weather-resistant construction. With support for both 1.4x and 2x teleconverters, the lens can also cover substantially more distant subjects when needed.

The Fujifilm XF 400mm f/4.5 R LM OIS WR is available for preorder.