Fujifilm has launched the FUJINON XF400mmF4.5 R LM OIS WR, a new super-telephoto prime lens for its X Series mirrorless cameras. The lens combines a 400mm focal length and F4.5 aperture with a relatively lightweight 1,245g body, while offering up to 5.5 stops of optical image stabilization.
Designed for wildlife, birds, motorsports and aviation photography, the XF400mmF4.5 delivers a 609mm-equivalent field of view on Fujifilm's APS-C X Series cameras. Fujifilm has also designed it to work with its 1.4x and 2x teleconverters, extending the equivalent reach to 853mm and 1,219mm respectively.
What Is the Fujifilm XF400mmF4.5 R LM OIS WR?
The XF400mmF4.5 R LM OIS WR is a super-telephoto prime lens designed for Fujifilm X-mount cameras.
Its physical focal length is 400mm, but because Fujifilm's X Series uses an APS-C sensor, the lens provides a 609mm equivalent field of view in 35mm terms. That makes it particularly suited to subjects that are difficult or undesirable to approach closely.
The F4.5 maximum aperture also gives photographers more light-gathering capability than slower super-telephoto lenses, which can help when photographing fast-moving subjects with faster shutter speeds.
What Are the Fujifilm XF400mmF4.5 Key Specifications?
Here are the main specifications of the new Fujifilm super-telephoto lens:
| Specification | Fujinon XF400mmF4.5 R LM OIS WR |
|---|---|
| Lens type | Super-telephoto prime |
| Mount | Fujifilm X mount |
| Focal length | 400mm |
| 35mm equivalent | 609mm |
| Maximum aperture | F4.5 |
| Minimum aperture | F22 |
| Optical construction | 21 elements in 14 groups |
| ED elements | 4 ED + 2 Super ED |
| Aperture blades | 9, rounded |
| Image stabilization | Up to 5.5 stops |
| Minimum focus distance | 2.75m |
| Maximum magnification | 0.16x |
| Filter size | 95mm |
| Dimensions | Approx. 104.5 × 239.5mm |
| Weight | Approx. 1,245g |
Fujifilm says the lens uses 21 elements in 14 groups, including two Super ED and four ED elements, to help control chromatic aberration and maintain high resolution.
Why Is the 609mm Equivalent Focal Length Important?
A 609mm-equivalent focal length gives photographers substantial reach without requiring them to physically move close to their subjects.
This is particularly useful for wildlife photography, where getting too close can disturb animals. It can also help sports and aviation photographers isolate distant subjects while maintaining a relatively tight composition.
The combination of long reach and an F4.5 aperture is one of the lens's major selling points.
Fujifilm specifically highlights birds, motorsports and aircraft as applications where the lens can take advantage of its long focal length and fast aperture.
How Much Does the XF400mmF4.5 Weigh?
Despite its 400mm focal length, the lens weighs approximately 1,245 grams, excluding the lens cap and hood.
That's a key part of Fujifilm's pitch for the lens. Super-telephoto lenses can become difficult to carry and use for extended periods, particularly during wildlife or outdoor photography sessions.
Fujifilm says the compact design comes from measures including reducing the lens diameter, shortening its overall length and using the APS-C format's 1.5x crop factor.
For photographers spending hours outdoors, reducing the physical burden can be almost as important as optical performance.
What Image Stabilization Does the New Lens Offer?
The XF400mmF4.5 features up to 5.5 stops of optical image stabilization.
At such a long focal length, even small camera movements can become visible in photographs. Stabilization is therefore especially useful when shooting handheld or when working in situations where carrying a tripod is inconvenient.
Fujifilm says its improved shake-detection accuracy and optimized stabilization mechanism help provide the 5.5-stop performance.
The actual benefit will depend on shooting conditions, camera movement and shutter speed, so the 5.5-stop figure should be understood as a rated stabilization performance rather than a guarantee of five-and-a-half stops in every situation.
What Optical Design Does the XF400mmF4.5 Use?
The lens contains 21 optical elements arranged in 14 groups.
Among those are four ED elements and two Super ED elements. These specialized elements are designed to reduce chromatic aberration, which can become particularly noticeable in long telephoto designs.
The goal is to maintain detail and color accuracy even when photographing subjects at considerable distances.
The lens also uses a nine-blade rounded diaphragm, which can help create smoother out-of-focus areas when shooting at wider apertures.
How Fast Is the Autofocus?
Fujifilm has equipped the XF400mmF4.5 with a linear motor autofocus system.
The company describes its autofocus as fast and near-silent, with advanced subject detection helping photographers track moving subjects.
A particularly useful feature is the focus preset function, which allows photographers to save a focus position and quickly return to it using the SET button. There is also a focus control button near the front of the lens barrel and a focus limiter for restricting the autofocus range when shooting distant subjects.
The focus limiter is especially relevant for wildlife and sports because it can reduce unnecessary focus searching when the photographer knows the subject is beyond a certain distance.
Can the XF400mmF4.5 Be Used With Teleconverters?
Yes. Fujifilm designed the lens to work with its existing XF teleconverters.
With the FUJINON XF1.4X TC WR, the lens becomes a 560mm lens, equivalent to approximately 853mm in 35mm format.
With the FUJINON XF2X TC WR, the focal length increases to 800mm, providing approximately 1,219mm full-frame equivalent reach.
| Configuration | Physical focal length | 35mm equivalent |
|---|---|---|
| XF400mmF4.5 alone | 400mm | 609mm |
| With XF1.4X TC WR | 560mm | 853mm |
| With XF2X TC WR | 800mm | 1,219mm |
This gives wildlife and aviation photographers considerable flexibility when they need additional reach.
Is the Fujifilm XF400mmF4.5 Weather Resistant?
Yes. The lens has a weather-resistant construction designed for outdoor photography.
Fujifilm's product information highlights its suitability for demanding outdoor conditions, while the detailed launch information specifies sealing across the lens barrel and resistance to low temperatures down to -10°C.
The front element also features a fluorine coating intended to help protect against moisture and other contaminants.
This is particularly useful for wildlife photographers who may spend long periods outdoors in changing weather.
What Can You Photograph With the XF400mmF4.5?
The lens is aimed at photographers who need substantial reach.
Wildlife and birds
The 609mm-equivalent field of view makes the lens naturally suited to birds and other wildlife. Photographers can fill more of the frame while maintaining greater distance from the subject.
Motorsports
The combination of long reach, F4.5 aperture, fast autofocus and stabilization is useful for photographing cars and motorcycles moving around large circuits.
Aviation
Aircraft photographers can benefit from the long focal length when shooting planes from the ground, particularly when the subject is high or distant.
Outdoor sports
The lens can also be used for field sports where photographers may be positioned far away from the action.
Fujifilm's own sample images demonstrate wildlife, motorsport and landscape applications for the lens.
What Is the Minimum Focus Distance?
The minimum focusing distance is 2.75 metres, with a maximum magnification of 0.16x.
For a lens with this level of reach, the ability to focus from 2.75 metres gives photographers some flexibility when subjects move relatively close.
It also means the XF400mmF4.5 isn't limited exclusively to extremely distant subjects.
How Much Does the Fujifilm XF400mmF4.5 Cost?
Fujifilm North America has announced a manufacturer's suggested retail price of $3,199.95 in the United States and $3,899.99 in Canada.
The US release is scheduled for mid-September 2026.
Japan has a separate launch schedule, with Fujifilm listing the domestic release for September 18, 2026 and an open retail price rather than a fixed manufacturer's suggested retail price.
An official India price was not identified in Fujifilm's current announcement, so it would be premature to quote an India price without a local announcement.
Is the XF400mmF4.5 a Good Alternative to the XF500mmF5.6?
The two lenses serve somewhat different priorities.
The XF400mmF4.5 offers a wider F4.5 aperture and a shorter physical focal length, while the XF500mmF5.6 provides greater native reach.
The new 400mm lens also has a significant portability advantage for photographers who prioritize mobility while retaining the option to add a teleconverter when extra reach is needed.
The better choice will ultimately depend on whether the photographer values aperture, native reach, portability and the intended shooting environment most.
What Does the New Lens Mean for Fujifilm X Series Photographers?
The XF400mmF4.5 fills an important space in Fujifilm's X-mount lineup.
It gives APS-C users a 609mm-equivalent super-telephoto prime without the size and weight traditionally associated with some very long professional lenses.
With teleconverters, the system can reach well beyond 1,000mm equivalent, while optical stabilization, weather resistance and fast autofocus make the lens practical for demanding outdoor photography.
Fujifilm says the addition completes its large-aperture super-telephoto prime range, covering roughly 300mm through 800mm in full-frame-equivalent terms.
Fujifilm XF400mmF4.5: Key Takeaways
The new lens stands out because it combines several features that don't always appear together in a super-telephoto design:
- 400mm F4.5 optical design
- 609mm full-frame equivalent reach
- 1,245g weight
- 5.5-stop optical stabilization
- 21-element, 14-group construction
- Two Super ED and four ED elements
- Fast, near-silent autofocus
- Focus preset and focus limiter functions
- Weather-resistant construction
- 2.75m minimum focus distance
- Compatibility with 1.4x and 2x teleconverters
- Up to 1,219mm equivalent reach with the 2x converter
FAQ
What is the Fujifilm XF400mmF4.5 equivalent to?
On Fujifilm's APS-C X Series cameras, the 400mm lens provides a field of view equivalent to approximately 609mm on a 35mm-format camera.
How much does the XF400mmF4.5 weigh?
The lens weighs approximately 1,245g, excluding its cap and hood.
How much does the Fujifilm XF400mmF4.5 cost?
The US MSRP is $3,199.95, with availability planned for mid-September 2026. Fujifilm's Japanese announcement lists the September 18 launch with an open retail price.
Can the XF400mmF4.5 use teleconverters?
Yes. The XF1.4X TC WR increases it to 560mm/853mm equivalent, while the XF2X TC WR provides 800mm/1,219mm equivalent reach.
The Bottom Line
The FUJINON XF400mmF4.5 R LM OIS WR is designed to make serious super-telephoto photography more mobile. Its combination of 609mm-equivalent reach, F4.5 aperture, 5.5-stop stabilization and 1,245g weight makes it particularly interesting for wildlife, sports and aviation photographers using Fujifilm X Series cameras.
At $3,199.95, it is firmly positioned as a premium lens, but Fujifilm is clearly targeting photographers who need professional-level reach without carrying an exceptionally heavy setup.