OM System M.Zuiko Digital 25mm F1.8 II

Focal length: 25 mm
Aperture: f/1.8
Weight: 156 g
Filter diameter: 46 mm
Min. focus distance: 25 cm
Length: 42 mm

Predecessor: Olympus M.Zuiko Digital 25mm F1.8

Overview

The OM System M.Zuiko Digital 25mm F1.8 II is a compact standard prime for Micro Four Thirds cameras. OM System announced it in February 2025 together with the OM-3 camera, as an updated version of the Olympus M.Zuiko Digital 25mm F1.8. The 25 mm focal length equals 50 mm on full frame, so the lens covers the classic normal angle of view for portraits, street and everyday work.

Optical design

The lens has 9 elements in 7 groups, including two aspherical elements. The optical formula is unchanged from the first version. The diaphragm has 7 blades and forms a circular opening, closing down to f/22. The angle of view is 47 degrees.

Autofocus and handling

Autofocus uses OM System's High-Speed Imager AF with an MSC mechanism. The minimum focus distance is 0.25 m with a maximum magnification of 0.12x, equal to 0.24x in full frame terms. There is no lens stabilizer and no manual focus clutch. Stabilization comes from the camera body.

Build and size

At 156 g, 59.4 mm in diameter and 42 mm in length, the lens is heavier than the first version at 136 g. The extra weight comes with updated weather sealing rated IPX1 (splash-proof, dust-proof and freezeproof). The filter thread is 46 mm.

Where it fits

The predecessor is the Olympus M.Zuiko Digital 25mm F1.8. For more speed and a larger lens there is the Olympus M.Zuiko Digital ED 25mm F1.2 Pro. Panasonic offers the Panasonic Lumix G 25mm F1.7 ASPH and the Panasonic Leica DG Summilux 25mm F1.4 II ASPH as alternatives on the same mount. The companion lens in this update is the OM System M.Zuiko Digital 17mm F1.8 II.

Pros and cons

Pros

Weather sealing to IPX1, according to OM System
Compact and light at 156 g
f/1.8 aperture with 7 circular blades
Standard 50 mm equivalent angle of view
Fast MSC autofocus

Cons

20 g heavier than the first version
No lens stabilizer
Maximum magnification of 0.12x
Slower than the f/1.7 and f/1.4 alternatives from Panasonic

Verdict

A small normal prime for Micro Four Thirds that gains weather protection over the first version. It is an update for those who want the same optics with better sealing, and a light option for those who start with the system.

Technical Specifications

min focal length: 25 mm
max focal length: 25 mm
max f (min zoom): f/1.8
max f (max zoom): f/1.8
min. aperture: f/22
Elements: 9
Groups: 7
Weight: 156 g (0.34 lb)
Filter diameter: 46 mm
min focus distance: 25 cm (9.84 in)
Length: 42 mm (1.65 in)
Diameter: 59.4 mm (2.34 in)

Simulate depth of field and angle of view

Which cameras does the OM System M.Zuiko Digital 25mm F1.8 II fit?

The OM System M.Zuiko Digital 25mm F1.8 II fits all Micro Four Thirds cameras. There its field of view equals 50 mm in full-frame terms (crop factor 2).

Micro Four Thirds cameras

Micro Four Thirds:: OM System PEN, OM System OM-3, OM System OM-5 Mark II, Panasonic Lumix G97 (G99M2), Panasonic Lumix GH7, OM System OM-1 Mark II, Panasonic Lumix G9 II, Panasonic Lumix G100D, OM System OM-5, OM System OM-1, Panasonic Lumix GH6, Panasonic Lumix GH5 II, Olympus PEN E-P7, Olympus OM-D E-M10 Mark IV, Olympus OM-D E-M1 Mark III, Panasonic Lumix G100 (G110), Panasonic Lumix BGH1, Olympus PEN E-PL10, Olympus OM-D E-M5 Mark III, Panasonic Lumix G95 (G90, G91), Olympus OM-D E-M1X, Panasonic Lumix GX9, Panasonic Lumix GF10 (GF90, GX880), Olympus PEN E-PL9, Panasonic Lumix GH5S, Blackmagic Pocket Cinema Camera 4K, Panasonic Lumix G9, Olympus OM-D E-M10 Mark III, Panasonic Lumix GF9 (GX850, GX800), Panasonic Lumix GH5, Olympus PEN E-PL8, Olympus OM-D E-M1 Mark II, Panasonic Lumix G85 (G80, G81), Panasonic Lumix GX85 (GX80, GX7 Mark II), Olympus PEN-F, Olympus OM-D E-M10 Mark II, Panasonic Lumix GX8, Panasonic Lumix G7, Panasonic Lumix GF7, Olympus OM-D E-M5 Mark II, Panasonic Lumix GM5, Olympus PEN E-PL7, Panasonic Lumix GH4, Olympus OM-D E-M10, Panasonic Lumix GM1, Olympus OM-D E-M1, Panasonic Lumix GX7, Olympus PEN E-PL6, Olympus PEN E-P5, Panasonic Lumix G6, Panasonic Lumix GF6, Blackmagic Pocket Cinema Camera, Olympus PEN E-PM2, Olympus PEN E-PL5, Panasonic Lumix GH3, Panasonic Lumix G5, Panasonic Lumix GF5, Olympus OM-D E-M5, Blackmagic Cinema Camera (MFT)