Yongnuo YN 17mm f/1.7M

The Yongnuo YN 17mm f/1.7M is a small wide-angle prime for Micro Four Thirds cameras. On this format, 17mm gives a mild wide view. That suits street photography, tight interiors, travel and groups of friends at a table. The f/1.7 aperture keeps it usable in dim rooms and after dark.

It arrived in 2024 and remains in production, so this is a current design rather than an older model. The trade-off is plain. You get a light, bright prime, but there is no zoom, no stabilization and no weather sealing.

If you like working with one focal length, those limits are easy to accept. A fixed wide view still handles plenty of everyday wide-angle shooting.

The lens weighs 6.3 oz (180 g) and measures 2.59 in (65.8 mm) across and 3.06 in (77.8 mm) long. It stays small on a compact body. A screw-in filter must match the 52mm thread. Our physical score is 64.

A 17mm prime on Micro Four Thirds behaves like a mild wide angle. You can stand inside a small cafe and still fit the room. At a table, it frames several faces without stepping back. Framing is fixed, so you move your feet to change the composition.

The f/1.7 maximum aperture is the headline spec. In a dim bar or at dusk, it keeps shutter speeds workable without pushing ISO far. Wide open, it can also separate a nearby subject from a busy background, though a 17mm frame never gives strong blur at distance. Stopping down also brings more of a room into focus.

Closest focus is 0.6 ft (18 cm). That lets you press up near a plate of food or a product on a desk and still use the wide view for context. Perspective gets bold at that distance, so keep it deliberate.

Seven aperture blades form the opening, and their shape can show in small out-of-focus highlights. Our optics score is 83.

This lens has no image stabilization, so the camera body must supply any correction. At 17mm, handheld shutter speeds can stay fairly short before shake shows, which softens the loss. For video or long exposures, plan on a tripod or a stabilized body. Bracing your elbows on a wall works too.

There is no weather sealing either. Rain, sea spray and dust are risks in this lens's usual territory. A simple rain sleeve covers the gap.

The front glass also lacks a fluorine coating, the kind that repels water and oil. Fingerprints and rain spots will need a cloth more often.

Inside, 10 elements sit in 9 groups. Two aspherical elements use specially shaped surfaces that help correct distortion. That matters when walls and doorframes fill a wide frame. Focus is internal, so the barrel does not extend while focusing.

Two low-dispersion elements help reduce chromatic aberration, the coloured fringes that can appear along high-contrast edges such as rooftops against sky. Our construction score is 54.