Thypoch Eureka 28mm F2.8

Focal length: 28 mm
Aperture: f/2.8
Weight: 154 g
Filter diameter: 27 mm
Min. focus distance: 40 cm
Length: 29.3 mm

Overview

The Thypoch Eureka 28mm F2.8 is a manual-focus full-frame pancake lens for Leica M and Fujifilm X mount. Thypoch took pre-orders from November 2025 and released it on 28 April 2026 as the second lens of its Eureka series of compact, vintage-styled lenses. The 28mm focal length and the very small size are the main points: Thypoch says it was designed for shooting reversal film while traveling, with little vignetting.

Optical design

Thypoch lists 7 elements in 4 groups. The press release mentions one aspherical element and three high-refractive-index elements with modern multi-layer nano coatings, while the product page states one precision-molded aspherical element and two high-refractive-index elements, three for the X-mount version, so the exact count of the HRI elements is not consistent between Thypoch's own sources. The 8-blade aperture runs from F2.8 to F16. The minimum focusing distance is 0.4 m, the image circle is 43.2 mm for full frame, and the diagonal angle of view is 75 degrees. Thypoch says the optical design went through three versions to reach low vignetting and low distortion.

Focusing and handling

Focusing is manual. Thypoch also sells the M-mount version bundled with an M-X adapter. The body is available in Pearl White and Matte Black, and the front diameter is 28.3 mm with a 27 mm filter size.

Build and size

The body is brass with an aluminum alloy part, an anodized finish and a pearl white lacquer on the white version. The Leica M version weighs about 133 g and measures 21.9 mm at 0.4 m focus and 19.5 mm at infinity. The Fujifilm X version weighs about 154 g and is 29.3 mm at 0.4 m and 26.9 mm at infinity. The press release quotes 137 g.

Where it fits

For Leica M, other compact 28mm lenses in the database include the Leica Elmarit-M 28mm f/2.8 ASPH at 180 g and the Leica Summicron-M 28mm f/2 ASPH (2023) at 275 g. The Eureka is clearly lighter than both. On Fujifilm X, this full-frame designed lens acts as a roughly 42mm equivalent field of view on the APS-C sensor and the Simera 28mm F1.4 is the faster, larger sibling.

Pros and cons

Pros

Very small and light at 133 g to 154 g
Full-frame image circle on a pancake body
Brass construction with vintage styling
Two finishes and an optional M-X adapter bundle

Cons

Manual focus only
F2.8 maximum aperture is slow compared with the Simera series
0.4 m minimum focusing distance
Inconsistent HRI element count in Thypoch's own material

Verdict

The Eureka 28mm F2.8 is a pocketable manual 28mm for Leica M and Fujifilm X. It suits photographers who want a very small lens with vintage handling.

Technical Specifications

min focal length: 28 mm
max focal length: 28 mm
max f (min zoom): f/2.8
max f (max zoom): f/2.8
min. aperture: f/16
Elements: 7
Groups: 4
Weight: 154 g (0.34 lb)
Filter diameter: 27 mm
min focus distance: 40 cm (15.75 in)
Length: 29.3 mm (1.15 in)
Diameter: 28.3 mm (1.11 in)

Simulate depth of field and angle of view

Which cameras does the Thypoch Eureka 28mm F2.8 fit?

The Thypoch Eureka 28mm F2.8 fits all Fujifilm X-Mount cameras. There its field of view equals 42 mm in full-frame terms (crop factor 1.5).

Fujifilm X-Mount cameras

APS-C:: Fujifilm X-T30 III, Fujifilm X-E5, Fujifilm X-M5, Fujifilm X-T50, Fujifilm X-S20, Fujifilm X-T5, Fujifilm X-H2, Fujifilm X-H2S, Fujifilm X-T30 II, Fujifilm X-E4, Fujifilm X-S10, Fujifilm X-T4, Fujifilm X-T200, Fujifilm X-Pro3, Fujifilm X-A7, Fujifilm X-T30, Fujifilm X-T3, Fujifilm X-T100, Fujifilm X-H1, Fujifilm X-A5, Fujifilm X-E3, Fujifilm X-T20, Fujifilm X-A10, Fujifilm X-A3, Fujifilm X-T2, Fujifilm X-E2S, Fujifilm X-Pro2, Fujifilm X-T10, Fujifilm X-A2, Fujifilm X-T1, Fujifilm X-E2, Fujifilm X-A1, Fujifilm X-M1, Fujifilm X-E1, Fujifilm X-Pro1