Fujifilm has announced the Fujinon XF400mmF4.5 R LM OIS WR, a super-telephoto prime for its APS-C X-mount system. The lens delivers a 609mm equivalent field of view in 35 mm terms while weighing about 1,245 g (2.74 pounds), and it slots between the existing XF200mmF2 and XF500mmF5.6 to complete Fujifilm’s long-lens trio.
Optical construction
The XF400mm uses 21 elements in 14 groups, including four ED (Extra-low Dispersion) elements and two Super ED elements. Fujifilm says that combination suppresses the chromatic aberration that tends to plague super-telephoto designs, and that the lens resolves distant subjects with fine detail.
Aperture runs from F4.5 to F22 through a nine-blade rounded diaphragm. The front takes 95 mm filters.
Image stabilization and handling
Optical image stabilization is rated at up to 5.5 stops, which should make handheld work realistic at this focal length.
Weight is the other half of that story. At 2.74 pounds and 9.4 inches long, the XF400mm is unusually portable for a 609mm-equivalent lens. Fujifilm got there by shrinking the lens diameter, shortening the barrel and thinning the housing, then leaning on the APS-C crop factor to do the rest of the work. An optimized optical design also shifts the center of gravity back toward the camera body, which counters the front-heavy feel most super-telephotos have and cuts fatigue over a long day.
The barrel carries 20 sealed points and is rated to 14°F (-10°C). A fluorine coating on the front element repels water and resists smudging.
Autofocus
A high-speed linear motor drives an internal focusing group. Fujifilm describes the result as fast and near-silent, which matters as much for skittish wildlife as it does for the shot itself.
Two controls cut reaction time. The focus limiter restricts autofocus to more distant subjects, and a focus preset lets you save a position and snap back to it with the control button. Both are genuinely useful for sports and wildlife, where the difference between getting the shot and missing it is often a second of hunting. Minimum focus distance is 9 feet (2.75 meters), for 0.16x magnification.
Teleconverter support
Both of Fujifilm’s teleconverters work with the lens. The XF1.4X TC WR extends it to 560 mm, or 853 mm equivalent. The XF2X TC WR pushes it to 800 mm, or 1,219 mm equivalent.
What we think
The XF400mm is built for wildlife, sports and aviation, and the weight is what makes it interesting. Getting 609 mm of equivalent reach into something you can carry all day without a monopod is the whole pitch, and Fujifilm delivered it.
Some shooters will find F4.5 modest. That’s the tradeoff that keeps the lens portable, and it’s still two-thirds of a stop faster than the XF500mmF5.6. The price isn’t small either, though at $3,199.95 it undercuts what the XF500mm now sells for after tariff increases.
Pricing and availability
The Fujinon XF400mmF4.5 R LM OIS WR ships in mid-September 2026 at $3,199 in the US and $3,899 in Canada.
