Question 1

What is the full-frame equivalent focal length of the Fujifilm XF 100-400mm?

Accepted Answer

On any Fujifilm X-mount body with its APS-C sensor, the 1.52x crop factor turns the 100–400mm range into a full-frame equivalent of approximately 152–609mm. That's serious reach — comparable to what a 600mm prime delivers on a full-frame body.

Question 2

How does the Fujifilm XF 100-400mm compare to the Fujinon XF 70-300mm f/4-5.6 R LM OIS WR?

Accepted Answer

The Fujinon XF 70-300mm f/4-5.6 R LM OIS WR is lighter, more compact, and starts wider at 70mm, making it a more versatile travel option. The XF 100-400mm gives you more reach at the long end (609mm equivalent vs 457mm), a slightly faster maximum aperture at 400mm (f/5.6 vs f/6.1 on the 70-300), and generally more robust weather sealing. If you're shooting birds in flight or sports where you consistently need maximum distance, the 100-400mm has the edge. For mixed travel and wildlife use, the 70-300mm is a lighter, more pocketable alternative.

Question 3

How does the XF 100-400mm compare to the Fujifilm XF 150-600mm f/5.6-8 R LM OIS WR?

Accepted Answer

The Fujifilm XF 150-600mm f/5.6-8 R LM OIS WR reaches further (up to 914mm full-frame equivalent) but has a narrower maximum aperture of f/5.6–8 throughout. The XF 100-400mm starts at f/4.5 and covers a wider range from 100mm, which is more useful in lower light and gives autofocus systems an easier time. If outright reach is your priority, the 150-600mm wins; if you need more versatility across lighting conditions, the 100-400mm is the smarter pick.

Question 4

Is the Fujifilm XF 100-400mm 4.5-5.6 weather sealed?

Accepted Answer

Yes. The XF 100-400mm f/4.5-5.6 R LM OIS WR features full weather sealing across its barrel, making it resistant to dust and moisture. Pair it with a weather-sealed Fujifilm X-mount body for a fully protected setup when shooting in rain or challenging outdoor conditions.

Question 5

How good is the autofocus on the Fujifilm XF 100-400mm?

Accepted Answer

The linear motor (LM) drive gives this lens fast, near-silent autofocus — a real advantage for wildlife and sport where sound matters and subjects move unpredictably. The AF is particularly responsive when tracking moving subjects, and pairs well with the subject-detection features found on bodies like the Fujifilm X-H2S. For best results with fast-moving birds or athletes, use continuous AF with your body's tracking mode enabled.

Question 6

How heavy is the Fuji XF 100-400mm, and can you handhold it?

Accepted Answer

The lens weighs 1,375g and measures 211mm in length with a 95mm barrel diameter — substantial but manageable for shorter sessions. The built-in OIS helps significantly when handholding at the 400mm end. For extended shoots like all-day safaris or long sports sideline sessions, a monopod takes the strain off without limiting mobility the way a tripod would.

Question 7

What filter size does the Fujifilm XF 100-400mm use?

Accepted Answer

The XF 100-400mm uses a 77mm filter thread. This is a common professional filter size, so you'll find a wide range of compatible polarising filters, ND filters, and protective filters readily available. A circular polariser is especially useful for cutting glare when shooting wildlife near water.

Question 8

Is buying a used Fujifilm XF 100-400mm worth it?

Accepted Answer

Absolutely — this is one of those lenses where the used market makes a lot of sense. The all-metal construction means it holds up well over time, and the weather sealing doesn't degrade with normal use. On Camera-tweedehands.nl, every second-hand copy is professionally inspected and comes with a minimum of 12 months warranty, so you're not taking a blind risk. It's a practical way to get into serious telephoto shooting on a Fujifilm X system without the new retail outlay.

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