What's the difference between the Voigtländer Ultron 27mm F2 X and the Fujifilm XF 35mm F2 R WR?

The Ultron 27mm F2 X leads on a lighter 120g body, a more compact 23.5 mm barrel, closer 0.25 m focusing. The XF 35mm F2 R WR leads on autofocus at all, where the Ultron 27mm F2 X is manual focus only, weather sealing.

Which is smaller, the Voigtländer Ultron 27mm F2 X or the Fujifilm XF 35mm F2 R WR?

The Ultron 27mm F2 X is the smaller, lighter lens at 120g and 23.5 mm long, versus 170g for the XF 35mm F2 R WR.

Which is faster, the Voigtländer Ultron 27mm F2 X or the Fujifilm XF 35mm F2 R WR?

Both open to f/2, so they gather the same light and give the same depth-of-field control.

Voigtländer Ultron 27mm F2 X vs Fujifilm XF 35mm F2 R WR: full comparison

The Ultron 27mm F2 X leads on more of the measurable specs, but the XF 35mm F2 R WR counters on autofocus at all, where the Ultron 27mm F2 X is manual focus only and weather sealing.

Read the full Ultron 27mm F2 X review →Read the full XF 35mm F2 R WR review →

The short version

The Voigtländer Ultron 27mm F2 X and Fujifilm XF 35mm F2 R WR are two X-mount primes at different focal lengths — the Ultron 27mm F2 X (40mm equivalent) and the XF 35mm F2 R WR (53mm equivalent). The Ultron 27mm F2 X is the newer design, from 2023.

On the spec sheet the Ultron 27mm F2 X pulls ahead with a lighter 120g body, a more compact 23.5 mm barrel, and closer 0.25 m focusing, plus a couple of smaller edges.

The XF 35mm F2 R WR answers with autofocus at all, where the Ultron 27mm F2 X is manual focus only and weather sealing.

So which one? Start with the focal length you actually want to shoot: the 40mm-equivalent Ultron 27mm F2 X or the 53mm-equivalent XF 35mm F2 R WR. Once that's settled, Ultron 27mm F2 X has the edge on the specs above.

Where the Ultron 27mm F2 X wins

+a lighter 120g body
+a more compact 23.5 mm barrel
+closer 0.25 m focusing
+higher 0.15× magnification
+a 10-blade diaphragm

Where the XF 35mm F2 R WR wins

+autofocus at all, where the Ultron 27mm F2 X is manual focus only
+weather sealing

Who should buy the Ultron 27mm F2 X or XF 35mm F2 R WR?

Buy the Ultron 27mm F2 X if…

Pick the Ultron 27mm F2 X if a lighter 120g body and a more compact 23.5 mm barrel matter to you. Photographers who want the deliberate, set-the-camera-first way of shooting a rangefinder-style prime on a small Fuji body, and who value rendering and build over autofocus and sealing. Read the full Ultron 27mm F2 X review for the details.

Buy the XF 35mm F2 R WR if…

Pick the XF 35mm F2 R WR if autofocus at all, where the Ultron 27mm F2 X is manual focus only and weather sealing matter to you. Photographers who want one sharp, reliable, weather-sealed 53 mm-equivalent standard prime and value consistency over a distinctive rendering. Read the full XF 35mm F2 R WR review for the details.

Ultron 27mm F2 X vs XF 35mm F2 R WR: pros and cons

Voigtländer Ultron 27mm F2 X	Fujifilm XF 35mm F2 R WR
Sharp in the centre from f/2, with short focus falloff and clean specular highlights. All-metal build, third-stop aperture clicks, and a focus tab with a hard infinity stop. Ten straight blades give defined ten-point sunstars from around f/2.8. Electronic contacts: EXIF, focus peaking and check, distance display, IBIS, X-Pro3 parallax correction. 25 cm minimum focus at a 40 mm-equivalent view — close enough for detail work.	One of the sharpest lenses Fujifilm makes — and sharp from wide open. Fast, near-silent autofocus on modern bodies; quick enough for moving subjects. Weather sealed and 170g — the prime owners trust in bad conditions. Fujicron value; pairs with the 23mm F2 for a cheap two-prime kit.
No autofocus, and a short focus throw that compresses everything past a few metres. Corners lag the XF 23mm F2 R WR wide open and only catch up around f/8. No weather sealing on a lens people mount to sealed X-Pro and X-T bodies. Post-2024 firmware on some Fuji bodies writes f/22 into EXIF instead of the set aperture. Around $600 — roughly 1.5× Fujifilm's own autofocusing 27mm pancake.	Rendering that a vocal group finds "clinical" — the reason some keep the F1.4. AF slows noticeably on older phase-detect bodies (X-Pro2, X-T1). Mild focus breathing and softer corners wide open. The tapered barrel shape is nobody's favourite.

Voigtländer Ultron 27mm F2 X

Fujifilm XF 35mm F2 R WR

Sharp in the centre from f/2, with short focus falloff and clean specular highlights.
All-metal build, third-stop aperture clicks, and a focus tab with a hard infinity stop.
Ten straight blades give defined ten-point sunstars from around f/2.8.
Electronic contacts: EXIF, focus peaking and check, distance display, IBIS, X-Pro3 parallax correction.
25 cm minimum focus at a 40 mm-equivalent view — close enough for detail work.

One of the sharpest lenses Fujifilm makes — and sharp from wide open.
Fast, near-silent autofocus on modern bodies; quick enough for moving subjects.
Weather sealed and 170g — the prime owners trust in bad conditions.
Fujicron value; pairs with the 23mm F2 for a cheap two-prime kit.

No autofocus, and a short focus throw that compresses everything past a few metres.
Corners lag the XF 23mm F2 R WR wide open and only catch up around f/8.
No weather sealing on a lens people mount to sealed X-Pro and X-T bodies.
Post-2024 firmware on some Fuji bodies writes f/22 into EXIF instead of the set aperture.
Around $600 — roughly 1.5× Fujifilm's own autofocusing 27mm pancake.

Rendering that a vocal group finds "clinical" — the reason some keep the F1.4.
AF slows noticeably on older phase-detect bodies (X-Pro2, X-T1).
Mild focus breathing and softer corners wide open.
The tapered barrel shape is nobody's favourite.

Pros and cons mirror the in-house Ultron 27mm F2 X review and XF 35mm F2 R WR review.

Ultron 27mm F2 X vs XF 35mm F2 R WR: full specs

Spec	Ultron 27mm F2 X 27 mm · f/2 · 120g	XF 35mm F2 R WR 35 mm · f/2 · 170g
Optical
Focal length	27 mm	35 mm
35mm equivalent	40 mm	53 mm
Maximum aperture	f/2	f/2
Minimum aperture	f/22	f/16
Optical construction	6 elements in 4 groups	9 elements in 6 groups
Special elements	1 extra-low-dispersion element, no aspherical glass	2 aspherical elements
Aperture blades	10	9
Focus & Stabilization
Min. focus distance	0.25 m	0.35 m
Max. magnification	0.15×	0.14×
Autofocus motor	Manual focus only	Stepping motor
Optical stabilization	No	No
Physical
Filter thread	43 mm	43 mm
Diameter × length	59.3 × 23.5 mm	60 × 45.9 mm
Weight	120g	170g
Weather sealing	No	Yes
Min. operating temp	—	-10 °C
General
Announced	2023-05-15	2015-10-21

Highlighted cells are best in class between these two. Specs sourced from the manufacturers' public product pages.

In-depth reviews

For the full long-form review of each lens, see the Voigtländer Ultron 27mm F2 X review and the Fujifilm XF 35mm F2 R WR review. Each carries the full spec breakdown, pros and cons, and where the lens sits in the X-mount lineup.