Reading Every Movement Off the Scale
F-Metric is the large-format monorail view camera in Arca-Swiss's F-line. It shares the same body and full front-and-rear movements as the entry-level F-Classic; the difference comes down to one word — Metric: rise/fall and shift become geared, self-locking micrometric movements with metric (mm / °) scales.
That means you can read each movement off as a number and repeat it precisely — invaluable for architecture and product work that needs repeatable, quantifiable adjustments. It takes both sheet film and digital backs, one of the few precision cameras equally at home with film and digital.
Design Philosophy
F-Metric's design comes down to a few principles:
Full front and rear movements — both standards offer rise/fall, shift, tilt and swing; two-way Scheimpflug without swapping parts, with free control of framing and the plane of focus.
Geared + metric scales (the “Metric” name) — rise/fall (±85mm) and shift (±30mm geared + 50mm manual extension) are self-locking micrometric movements with millimetre scales: lock on release, read off and repeat. Swing (±360° manual) and base tilt (±35° manual) stay manual.
Yaw-free base tilt — the F-line's base tilt is yaw-free (not all base tilts are — this is a deliberate F-line trait); tilting introduces no extra swing, so adjustments stay clean.
Optional Orbix® axis tilt — a retrofittable front geared tilt that pivots near the lens nodal point to minimise refocusing after tilt. Arca markets it as yaw-free; some users question the stronger “tri-axial yaw-free” claim.
Modular across formats — one chassis converts between 6×9 / 4×5 / 5×7 / 8×10 by swapping format frames and bellows; lens boards, bellows and standards carry across lines and generations.
F-Classic lets you make a movement; F-Metric lets you read it off and do it again, exactly — that is the whole meaning of Metric (scale).
The Family: Classic / Metric / Field
The F-line shares one chassis, split by whether the movements are geared/scaled and whether it folds for the field — don't let the names confuse you.
Specs at a Glance (4×5)
| Item | F-Metric |
|---|---|
| Format | 4×5 (modular to 6×9 / 5×7 / 8×10) |
| Rise / fall | ±85 mm geared micrometric + scale |
| Shift | ±30 mm geared + 50 mm manual extension |
| Base tilt | ±35° manual (yaw-free) |
| Orbix® tilt (option) | ±15° geared, detent every 2.5° |
| Swing | ±360° manual (bellows-limited) |
| Rail | telescoping monorail, 30 + 2×15 cm, to 45 cm |
| Bellows | standard 38 cm; wide / conical available |
| Lens board | 141 mm (4×5; also 110 / 171 mm) |
| Plane of focus | Scheimpflug (front / rear) |
| Weight | ~3 kg (C ~2.7 kg) |
| Back | sheet film + digital back |
Rise, shift, tilt and swing are available on both standards; other formats (6×9 / 5×7 / 8×10) differ.
Workflow: Shooting Large Format
Large-format work is slow and precise. F-Metric's metric scales make the movement step quantifiable and repeatable. A typical flow:
Compatibility: lenses / backs / bellows
Lenses — mounted on Arca's proprietary square lens boards (141mm current 4×5; also 110 / 171mm), compatible with most large / medium-format lenses: Rodenstock, Schneider, Fujinon, Nikkor and the like, in Copal 0 / 1 / 3 shutters.
Backs — ships with a 4×5 Graflok ground-glass back (with Fresnel) for sheet film; via adapters / sliding backs it also takes Phase One, Hasselblad and other digital backs — film and digital interchangeable, ideal for hybrid workflows.
Bellows / rail — standard 38cm synthetic-leather bellows, with wide-angle / conical bellows for ultra-wide and large movements; a telescoping monorail (30 + 2×15cm, extends to 45cm); the Compact “C” version is a folding monorail for better portability.
Using F-Metric with Optaxis
F-Metric's movements pair with Optaxis — plan before you shoot:
Scheimpflug tilt calculation — enter shooting distance and tilt angle to preview where the focus plane lands and judge how much tilt you need.
Shift coverage check — based on your lens's image circle, verify your planned rise / shift stays inside the circle without darkening the corners (handy for stitching).
Bellows-factor compensation — at long focal lengths or close focus with large bellows extension, Optaxis computes the light loss and helps correct your exposure.
With F-Metric's metric scales, you can dial the movement Optaxis computes straight to the number on the camera — calculate and shoot, a closed loop.