A Primer for the Impatient but Curious · Fourth Edition, Expanded
The official manual for this camera runs more than 400 pages. You don't need 400 pages. You need about sixty minutes, a charged battery, and the willingness to push a few buttons you haven't pushed yet. What follows is a tour — not of every feature, but of the ones that will let you walk out the door this afternoon and come back with photographs worth keeping.
The Hour, Mapped · plus supplements for when you're ready
Before any menus, hold the camera. The X100VI's great trick is that almost nothing important lives in a menu — it lives on a dial, a ring, or a lever. If you know where your hand should go, the menus become optional.
The top plate
Left dial
ISO (inner ring, lifted and rotated) and Shutter Speed (outer ring)
Right dial
Exposure Compensation — the ±3 stop correction
Front ring
Aperture — on the lens itself, f/2 through f/16
Rear lever
Viewfinder toggle — switches between optical (OVF), electronic (EVF), and hybrid
A note on the OVF. It's the reason you bought this camera and not a Ricoh. Use it for street and daylight — it's fast and unfiltered. Switch to EVF for low light, macro, or when you need a perfectly accurate preview of your film simulation.
The back
Focus lever
The little joystick. Moves your focus point around the frame. Press in to re-center.
Q button
Quick menu — your most-used settings on one screen. You will use this constantly.
AEL / AFL
Locks exposure or focus. Half-press shutter does this too; the button lets you lock without shooting.
DISP/BACK
Cycles info overlays. Hold it to jump straight to button customization.
II.
The exposure dials, demystified.
10 minutes
You know the exposure triangle. What makes Fuji different is that the triangle is on the camera rather than buried in a menu. This means the mode you're in (P, A, S, M) is implied by which dials are on A:
Program (P)
Shutter = A, Aperture = A. Camera picks both. Fine for snapshots.
Aperture priority (A)
Shutter = A, Aperture = number. You pick depth of field, camera picks shutter. Your default from now on.
Shutter priority (S)
Shutter = number, Aperture = A. For motion (sports, kids running).
Manual (M)
Both are numbers. For tripod work, flash, or full control.
Aperture priority is the mode nine out of ten X100VI owners shoot in ninety percent of the time.
What aperture to pick
The lens runs f/2 to f/16. A working heuristic:
f/2–f/2.8 — portraits, shallow depth, indoors. Softer corners; the lens is at its most "characterful."
f/4 — the sweet spot. Sharp enough, still some subject separation. A terrific default.
f/5.6–f/8 — street, travel, anything where you want most of the scene in focus.
f/11–f/16 — landscapes on a tripod. Diffraction starts to soften things past f/11, so don't stop down without reason.
Try it now
Set shutter and ISO to A. Set aperture ring to f/4. Take three frames: one at f/2, one at f/4, one at f/8. Same subject. Notice what happens to the background.
Exposure compensation — the dial you'll actually use most
The right-hand top dial (marked -3 … 0 … +3) overrides the camera's meter by stops. In bright snow or backlit scenes, the camera wants to expose for the middle gray average and clips your subject dark. Bump to +⅔ or +1. For dark moody scenes (a dim bar, a shadowy alley), push to -1 so the camera doesn't lift shadows into mush.
Rule of thumb. If the image in your viewfinder looks too dark or too bright, turn the exp comp dial until it looks right. That's the whole trick. Live preview in the EVF shows you exactly what you'll get.
III.
Core settings, dialed in once.
10 minutes
Do this once and forget it. These are the settings that differ from factory defaults in ways that matter for how you plan to shoot.
Image quality & RAW
Auto ISO — so you never have to think about it
Auto ISO lets you shoot aperture priority and let the camera handle sensitivity, but within limits you set. The critical number is the minimum shutter speed — the slowest the camera will go before it raises ISO instead.
Why 1/125? The 23mm lens is about 35mm equivalent. Old rule: shutter ≥ 1/focal length. The X100VI has in-body stabilization so you can go slower for static scenes, but 1/125 keeps kids, hands, and walking strangers sharp.
A few menu hygiene items
IV.
Focus, the Fuji way.
8 minutes
There are three focus modes, selected by the switch on the left side of the camera:
S (single)
One focus lock per shutter press. Use this for almost everything.
C (continuous)
Camera keeps adjusting as the subject moves. For kids running, pets, anything in motion.
M (manual)
You focus with the front ring. Also where focus peaking and digital split-prism live.
Focus area modes
Inside AF-S, there are sub-modes. Via Q menu or AF/MF SETTING → AF MODE:
Single Point — one movable box. Precise. The right default.
Zone — a larger cluster of points. For erratic subjects (kids, pets).
Wide/Tracking — whole-frame, camera decides. Good for "just get it."
All — lets you swap between the above with the rear command dial. Also useful.
Face / eye detection
For family and portraits, turn this on:
Turn it off for street. It can get confused on crowded sidewalks and lock onto a face in the background. Consider assigning face detect on/off to a function button — Fn2 (the front button near the shutter) is a good home for it.
V.
Film simulations — the point of this camera.
10 minutes
Fuji's film simulations are not filters. They're factory color profiles baked into the JPEG engine, designed by the same people who spent decades making actual film stocks. They change the character of the image in ways that are very hard to replicate later. You set the simulation before the shot so you can see it live in the viewfinder.
There are around 20 of them. You do not need to learn 20. You need to learn four or five, well.
Reala Ace
New to X100VI · everyday default
Faithful colors with slightly more contrast than Provia. The "all-rounder" default. If unsure, start here.
Classic Chrome
Street · travel · documentary
Muted, magazine-like, slightly desaturated. The one photographers quote when they say Fuji has "that look." Works on overcast days especially.
Classic Negative
Warm moments · golden hour
Based on Superia film. Warm highlights, crunchy contrast, slightly greenish shadows. Incredible for kids-and-afternoon-light.
Astia
Portraits · skin
Soft tonality, gentle contrast, flattering skin. The one for family portraits and overcast-day faces.
Velvia
Landscapes · only
Punchy, saturated, vivid. Murder on skin tones. Reserve it for red rocks, sunsets, autumn leaves.
Acros
Black & white · the good one
Deep blacks, fine grain, gorgeous tonal transitions. Ignore "Monochrome" — Acros is always the better choice.
How to change it
Three ways, in order of speed:
Press the left button on the rear D-pad (default shortcut).
Press Q, navigate to the film roll icon, scroll with the wheel.
Full menu: IMAGE QUALITY SETTING → FILM SIMULATION.
Try it now
Put the camera in EVF mode so you can see the effect. Aim at something colorful — a rug, a plant, your morning coffee. Cycle through Reala Ace → Classic Chrome → Classic Negative → Velvia → Acros. Watch the scene transform in real time. Pick a favorite. Shoot it.
Because you're shooting RAW+JPEG. The simulation only bakes into the JPEG — your RAW is always recoverable to neutral in Lightroom. So: be bold with simulations. You can't break anything.
VI.
Your first four scenarios.
10 minutes
Recipes, not rules. Set these once, shoot, adjust.
1 · Street & everyday carry
Mode
Aperture priority — shutter A, aperture f/5.6 or f/8
ISO
Auto (125–6400, min shutter 1/250)
Focus
AF-S, Single Point, face detect off
Film sim
Classic Chrome or Acros
Trick
At f/8 on a 23mm lens, nearly everything from ~2m to infinity is sharp. You can shoot without fully focusing ("zone focus"). Aim and press.
2 · Travel & landscapes
Mode
Aperture priority — aperture f/8
ISO
Set manually to 125 when tripod-mounted; Auto for handheld
Focus
AF-S, Single Point, placed ⅓ into the scene
Film sim
Reala Ace or Velvia (skies, reds, greens)
Trick
Oregon's soft, often-overcast light is forgiving, but white skies can blow out. If the sky reads as pure white, dial exposure comp to -⅔ to hold some tonal detail. The RAW has recoverable highlights if needed.
3 · Family & kids
Mode
Aperture priority — aperture f/2.8 or f/4
ISO
Auto (min shutter 1/250; bump to 1/500 if kids are running)
Focus
AF-C, Zone, face + eye detection on
Film sim
Astia (soft skin) or Classic Negative (warm, nostalgic)
Trick
Hold the shutter halfway while following the child. The camera tracks them; you only finish pressing when you like the moment.
4 · JPEG-only run-and-gun
Mode
Aperture priority — f/4
Image quality
Switch to FINE only (no RAW) for higher buffer / more space
Focus
AF-S, Wide/Tracking, face detect on
Film sim
Whatever mood fits the day. Commit.
Trick
This is the mode for airdrop-to-phone-at-the-dinner-table shooting. The X100VI can transfer via the FUJIFILM XApp on your phone.
VII.
The pocket cheat sheet.
2 minutes
Buttons to memorize
Q button
Quick menu. Your most-used settings on one screen.
Front lever (face of camera)
Toggle OVF / EVF / hybrid.
Focus lever (rear joystick)
Move focus point. Press in to re-center.
Left D-pad
Film simulation shortcut.
Hold DISP/BACK
Jump to function button customization.
Exp comp dial
The most underused dial on the camera. Use it.
Set-and-forget paths
RAW + JPEG
IMAGE QUALITY → IMAGE QUALITY → FINE + RAW
Auto ISO
IMAGE QUALITY → ISO AUTO SETTING → AUTO1 → 125 / 6400 / 1/125
Silent operation
SET UP → SOUND SET-UP → OPERATION VOL. → OFF
Eye AF for family
AF/MF SETTING → FACE/EYE DETECTION → FACE ON / EYE AUTO
If lost, press
DISP/BACK
Backs out of any menu. The camera's universal undo.
Shutter half-press
Dismisses any menu, ready to shoot.
VIII.
Remap the buttons — make it yours.
15 minutes
Out of the box, the X100VI has defaults that are fine, not great. The single best investment you can make — after setting RAW + JPEG — is to teach the camera which controls matter to you. The payoff is that your most-used functions land under your fingers without a menu dive.
There are two ways into the remapping screen:
Fast: press and hold DISP/BACK for about two seconds. Lands you on the full list of Fn buttons, dials, and gestures.
Surgical: press and hold the specific button you want to change (e.g. the front Fn button) for about two seconds. Jumps directly to its assignment screen.
Menu path:SET UP → BUTTON/DIAL SETTING → FUNCTION (Fn) SETTING.
The philosophy here borrows from how Fuji ambassador Kevin Mullins configures his: use a small number of buttons deliberately, disable the rest to prevent accidental presses. Below is a configuration tuned to your shooting mix — street, family, travel, low light. Walk through it once and the camera stops fighting you.
The recommended mapping
Top plate & front
Front FnUnlabeled button on the front face, near the shutter
FACE/EYE DETECTION ON/OFFYour most-flipped setting. On for family, off for street. One press.
Top FnNext to the shutter button, marked Fn
PERFORMANCE or PHOTOMETRY (METERING)Performance lets you toggle Normal/Boost for battery vs responsiveness. Metering lets you jump to Spot for tricky backlit scenes. Pick whichever you'll use more.
Control RingThe ring behind the aperture ring on the lens
FILM SIMULATIONTurn the ring to scroll through film sims while composing. Better than the D-pad for this because you never take your eye off the viewfinder.
Back of camera
AEL/AFL buttonTop-right thumb rest area
AF-ONEnables "back-button focus." Shutter takes the shot; this button handles focus. After a week you won't go back.
Q buttonQuick Menu
Leave default (Q menu)No reason to touch this. The Q menu is already your fast lane.
D-pad: UpRear selector, up
FOCUS AREAOpens the focus-point grid. Handy when Single Point is active.
D-pad: Down
AF MODESwitch between Single Point / Zone / Wide without a menu dive.
D-pad: Left
Leave default (Film Simulation)Redundant with the control ring, but harmless as backup.
D-pad: Right
WHITE BALANCEThe other setting that actually changes your image character. Useful when a recipe calls for a specific WB.
Touch gestures (optional)
T-Fn1 (swipe up)
NONEPrevents accidents when your nose touches the screen in OVF mode.
T-Fn2 (swipe right)
ND FILTERThe X100VI has a built-in 4-stop ND. A swipe toggles it. Priceless for bright-sun portraits at f/2.
T-Fn3 (swipe down) & T-Fn4 (swipe left)
NONEFewer gestures = fewer accidental changes. You can always add later.
On back-button focus. This is the single most controversial assignment. For kids and street it's transformative — half-pressing the shutter to focus-and-recompose gets tiring and the camera can refocus at the worst moment. With AF-ON on the AEL button, your thumb controls focus independently from your index finger. You'll resist for two days, then refuse to shoot any other way.
Disable the touch controls you don't need
IX.
Four custom slots. Two recipes.
15 minutes
The X100VI has seven custom settings banks — C1 through C7 — which together hold a complete snapshot of image-related settings: film simulation, grain, color chrome, white balance, highlights, shadows, noise reduction, dynamic range, and more. You flip between them via the Q menu or by assigning recall custom to a button. It's the closest thing a digital camera has to loading a roll of film.
Classic Negative, face/eye detect baked in, AUTO WB
C3 — LANDSCAPE
Reala Ace, DR400, tuned for Oregon's overcast and green-heavy scenes
C4 — LOW LIGHT B&W
Acros+Y, push-process recipe, high ISO tolerance
How to save a custom slot
Dial in every image setting the way you want it (film sim, grain, WB, DR, highlight, shadow, color, sharpness, etc.). Then:
To load a slot while shooting: Q → base selector at top-left → scroll to the slot you want.
A caveat worth knowing. When you load a C-slot, changes you make afterward on the same slot are temporary unless you re-save. This is a feature — it means you can experiment without wrecking your preset. But it's also confusing the first time. If you adjust highlights to +1 on the fly and then switch to another slot and back, your tweak is gone.
Two recipes worth programming
These are two widely-loved community recipes from Ritchie Roesch's Fuji X Weekly, adapted for the X100VI's X-Trans V sensor. Copy the settings into the corresponding C-slot.
Kodachrome 64
C1 · STREET
The warm, slightly muted slide film Steve McCurry and Paul Simon loved
Film Simulation
Classic Chrome
Grain Effect
Weak, Small
Color Chrome Effect
Strong
Color Chrome FX Blue
Off
White Balance
Daylight
WB Shift
+2 Red / −5 Blue
Dynamic Range
DR200
Highlight
0
Shadow
+0.5
Color
+2
Sharpness
+1
High ISO NR
−4
Clarity
+3
ISO
Auto, up to 6400
Exp Comp
0 to +⅔ (typical)
Recipe by Ritchie Roesch · Kodachrome 64 for X-Trans V. Shoot this in sunny or golden-hour light for maximum effect; it's what "Fujifilm film look" means to most people.
Acros Push-Process
C4 · LOW LIGHT B&W
High-ISO monochrome with attitude — for bars, dinner tables, night walks
Film Simulation
Acros + Y (or +R, +G)
Dynamic Range
DR-Auto
Highlight
+3
Shadow
+4
Noise Reduction
−4
Sharpness
−2
Grain Effect
Strong, Large
Color Chrome FX
Strong
Clarity
0
Toning
0 (off)
White Balance
Auto
ISO
Auto, up to 12800 or higher
Exp Comp
+⅓ (typical)
Adapted from Ritchie Roesch's Acros Push-Process recipe. Crank ISO higher than you'd dare in color — Acros turns noise into grain, and the result looks more like film the further you push it.
For the other two slots
Rather than prescribing a specific community recipe for Family and Landscape, start with Fuji's own simulations and tune by eye. These are solid starting points — save them, then adjust based on what your actual pictures look like:
Family & Kids
C2 · FAMILY
Warm, forgiving, fast-focusing — for the moments that move
Film Simulation
Classic Negative
Grain Effect
Weak, Small
Color Chrome Effect
Strong
Color Chrome FX Blue
Weak
White Balance
Auto
Dynamic Range
DR400
Highlight
−1
Shadow
+1
Color
0
Sharpness
0
Clarity
0
ISO
Auto, up to 6400, min shutter 1/250
Focus
AF-C, Zone, Face+Eye On
Classic Negative's warm highlights and slightly green shadows flatter skin and make afternoon light sing. DR400 rescues blown windows behind your kids.
Oregon Landscape
C3 · LANDSCAPE
Faithful color, tuned for overcast light and green-heavy scenes
Film Simulation
Reala Ace
Grain Effect
Off
Color Chrome Effect
Strong
Color Chrome FX Blue
Weak
White Balance
Auto
Dynamic Range
DR400
Highlight
−1
Shadow
+1
Color
+1
Sharpness
+1
Clarity
+2
ISO
125 (tripod) or Auto to 1600 (handheld)
Exp Comp
−⅓ for white skies, 0 otherwise
Color Chrome FX Blue at Weak (not Strong) keeps overcast skies from going cobalt when you want them silvery. Auto WB handles the shifting light of Oregon forests and fog better than locked Daylight. DR400 rescues blown-out sky patches showing through tree canopy. For a blue-sky day at the coast, temporarily bump Color Chrome FX Blue to Strong in the moment (see caveat in Ch. IX about on-the-fly slot edits).
The test drive
Program all four slots this afternoon. Then go for a walk without adjusting anything — switch slots instead of switching settings. Q menu → top-left selector → pick one. You'll learn quickly which slot matches which kind of scene, and the camera stops feeling like a menu system.
When you want more recipes. The Fuji X Weekly X-Trans V library has well over a hundred, organized by film stock, mood, and era. The free Fuji X Weekly app (iOS · Android) makes them searchable. The Patron tier ($1.99/mo) lets you import recipes directly to the camera over Bluetooth — worth it if you end up using more than a handful.
X.
Firmware — keep the camera current.
5 minutes
Fujifilm practices what they call Kaizen — continuous improvement. They push meaningful updates to cameras years after purchase, including autofocus algorithm revisions, new film simulations, XApp feature additions, and bug fixes. The X100VI has received several firmware releases since launch, including a notable autofocus accuracy improvement (v1.20) and wireless security enhancements (v1.30 and beyond). As of early 2026 the public version is around 1.31, with some cameras shipping with 1.32 or later pre-installed.
Check your version
Turn the camera on while holding the DISP/BACK button. The screen shows your current firmware. Alternatively: SET UP → USER SETTING → FIRMWARE VERSION.
The two update methods
Via XApp (easy)
Open FUJIFILM XApp on your phone, connect to the camera, and it'll offer any new firmware. Good for routine updates.
Via SD card (reliable)
Download FPUPDATE.DAT from Fuji's site, copy to the root of a formatted SD card, insert into camera, and menu into the firmware update prompt. The method experienced Fuji users prefer — no Bluetooth/WiFi failure modes.
When to update. Not the day a release drops. Wait a week and check community reports (DPReview forums, Fuji Rumors, r/fujifilm) for any regression issues. If you have a trip or important shoot in the next few days, defer until after. Otherwise, staying reasonably current is worth it — autofocus updates in particular are meaningful.
A useful bookmark. Kevin Mullins maintains a Fujifilm firmware tracker — a single page with the current version of every recent Fuji body, updated when new firmware drops. Easier than the official site for a quick check.
XI.
Troubleshooting — things that will confuse you.
5 minutes
Every X100VI owner hits a handful of these in the first month. Filing them here so you don't spend an afternoon searching forums.
"The framing in my OVF doesn't match my photo"
That's not a bug — it's how optical viewfinders work. You're looking through a window offset from the lens, so what you see is roughly the frame, not precisely. The bright-line frame inside the OVF approximates the capture area, and even shifts as you focus closer (parallax correction). For precise framing, switch to the EVF via the front lever. For street and general shooting, the OVF's approximation is a feature, not a flaw — you see context outside the frame too.
"My lens is hunting in low light and missing focus"
The X100VI's AF is much improved but not miraculous, and the lens is known to hunt at f/2 in dim scenes. Fixes, in order:
Stop down to f/2.8 or f/4 if possible — the lens focuses more decisively at smaller apertures
Switch from AF-S to AF-C with Single Point — faster acquisition in many low-light cases
Turn on the AF assist illuminator: AF/MF SETTING → AF ILLUMINATOR → ON
Enable Boost mode: POWER MANAGEMENT → PERFORMANCE → BOOST — eats battery but speeds AF
As a last resort, manual focus with peaking — the lens's focus-by-wire response is quick
"My ND filter won't engage / engages when I don't want it"
The built-in 4-stop ND has three modes: Off, On, and Auto. Auto kicks in when the camera decides it's needed. For predictability, set it manually:
SHOOTING SETTING → ND FILTER → ON or OFF
Or, if you followed this guide: push-hold the front lever to the right to toggle the ND
Or, with the touch gesture assigned in Chapter VIII: swipe right on the LCD
"The EVF goes dark when I put my eye to it"
Normal — the eye sensor dimmed the LCD and switched to EVF. If the EVF itself is too dark: SCREEN SET-UP → EVF BRIGHTNESS. If the eye sensor triggers at the wrong time (your hand passing in front of the viewfinder), you can disable the automatic switch: SCREEN SET-UP → VIEW MODE, and pick EVF-only or LCD-only.
"My custom C-slot settings are reverting"
This trips up everyone. When you load a C-slot, any changes you make afterward are temporary. Switching to another slot and back loses them. To make a change permanent:
IMAGE QUALITY SETTING → EDIT/SAVE CUSTOM SETTING → SAVE CURRENT SETTINGS → pick the same slot → OK. This re-saves with the modification. It's a feature (experimental tweaks don't wreck your preset) but a confusing one at first.
"Battery dies way faster than I expected"
The X100VI's NP-W126S battery is small (~310 shots CIPA). Real-world figures: 400–500 with OVF use, 250–350 with EVF/LCD-heavy use. Mitigations:
Use OVF whenever possible — it's not drawing a screen
Set POWER MANAGEMENT → AUTO POWER OFF → 2 MIN (you did this in Chapter III)
Turn off Boost mode unless you need the AF speed
Buy two spare batteries. Third-party (Wasabi, Neewer) work fine and run ~$25 for two
"I can't connect to XApp / keeps dropping Bluetooth"
This is one of the most common community complaints, and it's usually fixed by: (1) updating both camera firmware and the XApp to current versions, (2) removing the camera's existing pairing in both the phone's Bluetooth settings and the camera's CONNECTION SETTING → Bluetooth/SMARTPHONE SETTING → PAIRING REGISTRATION, then (3) re-pairing from scratch. If still dropping, toggle the phone's airplane mode on and off.
"Shutter sound — can I make it silent?"
Yes. SHOOTING SETTING → SHUTTER TYPE → ELECTRONIC SHUTTER (ES) for fully silent operation. You did the MS+ES setting in Chapter III which is usually preferable — mechanical by default, electronic above 1/4000 or when silence is needed. For a library, a quiet dinner, or a NICU round: switch to ES-only for the duration.
XII.
Accessories worth considering.
5 minutes
The X100VI is a complete camera out of the box. You don't need anything else to start shooting. But a few accessories meaningfully change the experience — and one of them converts the camera from "not weather-sealed" to "weather-sealed," which matters more in Oregon than most places. The camera will see rain, sea spray at the coast, and misting-through-forest conditions — and the lens barrel is a dust-and-moisture entry point without the adapter ring and filter in place.
The adapter ring + protective filter (weather sealing)
The X100VI becomes weather-sealed only when you attach the AR-X100 adapter ring plus a 49mm protective filter. Without these, the lens barrel is a moisture and dust entry point. For PNW use — hikes in the Cascades, the Oregon Coast, forest walks in drizzle — this is the first accessory to buy.
Fuji AR-X100 adapter ring — official, ~$25, screws into the lens's filter threads (actually uses the 49mm thread once you remove the decorative front ring)
49mm UV or clear protective filter — B+W, Hoya, or Tiffen brands. A Tiffen Black Pro-Mist 1/8 (also 49mm) doubles as a mild diffusion filter for a soft highlight glow that pairs beautifully with Classic Negative
Conversion lenses (rare but transformative)
The X100VI's 23mm (35mm equivalent) fixed lens accepts two optional conversion lenses:
TCL-X100 II — converts to 50mm equivalent. Useful if you find 35mm too wide for portraits. ~$400
WCL-X100 II — converts to 28mm equivalent. Useful for interiors and landscapes. ~$400
Both maintain image quality well but add size and weight. Before buying: shoot at 50mm equivalent via the digital teleconverter (SHOOTING SETTING → DIGITAL TELE-CONV.) to decide if you actually want the focal length.
Digital teleconverter note. The DTC uses sensor cropping and upscaling to give 50mm or 70mm equivalents in-camera (JPEG only). It's surprisingly good on the 40MP sensor. Shoot a few frames this way before investing in a physical TCL.
Straps
The stock Fuji strap is fine but stiff and loud. Common upgrades:
Wrist strap instead of neck strap — many X100 owners prefer the Gordy's or Peak Design Cuff, since the camera is light enough to dangle from the wrist
Leather half case — adds grip, protects the body, stays on while you shoot. Gariz, Arte di Mano, and third-party options on Amazon from ~$40–150
Memory cards
The X100VI takes a single SD card (UHS-I compatible; UHS-II not supported, so don't pay for it). For RAW+JPEG shooting, a fast UHS-I V30 card is the sweet spot:
SanDisk Extreme Pro 128GB UHS-I or equivalent — ~$30, plenty fast for the X100VI's buffer
Format in-camera, not on a computer: SET UP → USER SETTING → FORMAT
Spare batteries
Covered in the troubleshooting chapter but worth repeating — buy two. The NP-W126S is the right model. Third-party (Wasabi, Neewer) work well for a fraction of Fuji's price; ~$25 for a two-pack with an external charger.
What to skip
L-brackets — unnecessary unless you use a tripod heavily
Lens hoods — the X100VI's built-in lens barrel provides adequate shading; Fuji's LH-X100 hood is more aesthetic than functional
External flash — the built-in pop-up flash is capable, and external flash defeats the camera's compactness. Skip unless you have a specific flash use case
Workflow Primer — processing RAW files from the X100VI. A second field manual, this one on what to do with your RAW files in Lightroom or Capture One. X-Trans files need different treatment than Bayer sensors — this covers it.
Field-Use Quick Card. One page, printable, fits in a camera bag. Just the settings tree and scenario recipes. Print this and keep it with the camera.
Now put this down, pick up the camera, and go make something.