Lens Yongnuo YN 25 mm f/1.7 M for Micro 4/3
The Yongnuo YN 25mm f/1.7 M is a fast, compact prime lens designed for mirrorless cameras with a Micro 4/3 mount, such as models from Panasonic and Olympus. Offering a focal length equivalent to 50 mm on full-frame cameras, its field of view is close to that of the human eye, making it well suited for portraiture, street photography, landscapes, night shots, and video recording.
Optical Design and Fast Aperture
The optical system features 7 elements arranged in 6 groups, including one aspherical element and two ED (extra-low dispersion) lenses. This design reduces chromatic aberrations and maintains uniform sharpness across the frame. The wide f/1.7 aperture facilitates low-light shooting and produces smooth background blur (bokeh), while the 7 rounded aperture blades create 14-point starburst effects around point light sources when stopped down.
Autofocus and Handling
- STM Stepping Motor: provides fast, quiet, and precise focusing for both photography and filmmaking.
- AF/MF Switch: enables immediate switching between automatic and manual focus, with manual ring adjustments supported in AF mode.
- Customizable Fn Button: allows quick access to a user-assigned function directly from the camera menu without opening settings.
- Lightweight Build: weighs only 150 g (without lens cap) and uses a standard 52 mm front filter thread.
| Model | Yongnuo YN 25 mm f/1.7 M |
|---|---|
| Mount | Micro 4/3 |
| Focal length | 25 mm (35 mm equivalent: 50 mm) |
| Autofocus mechanism | STM stepper motor |
| Field of view (diagonal) | 49.4° |
| Field of view (vertical) | 30.4° |
| Field of view (horizontal) | 39.9° |
| Maximum aperture | f/1.7 |
| Minimum aperture | f/22 |
| Optical construction | 7 elements in 6 groups (1 aspherical, 2 ED) |
| Number of aperture blades | 7 |
| Minimum focusing distance | 20 cm |
| Magnification ratio | 0.2x |
| Filter diameter | 52 mm |
| Dimensions | ⌀ 6.1 x 6.7 cm |
| Weight | 150 g (without lens cap) |
| EAN | 6972810421716 |
|---|
Which cameras are compatible with this lens?
This lens is built for Micro 4/3 mount cameras and camcorders, including Panasonic models such as G100, GH5, G9, G85, and GX9, as well as Olympus models including E-M5 II/III, E-M10 III/IV, PEN-F, and E-PL9/10.
What filter size does the lens accept?
The front thread accommodates standard 52 mm filters.
What is the closest distance the lens can focus?
The minimum focusing distance is 20 cm.
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