OM System OM-3

The OM-3 is a compact mirrorless camera released by OM System in 2025. It uses the Micro Four Thirds mount, so it takes Micro Four Thirds lenses.

The body weighs 413 grams, which keeps it easy to carry on walks, day trips and everyday outings.

Weather sealing, in-body stabilisation and an electronic viewfinder make it a practical choice for handheld shooting outdoors. That combination suits travel, everyday and outdoor photography, particularly for buyers who want a light kit that copes with changing conditions.

The OM-3 records both 4K and Cinema 4K at up to 60 frames per second, with 50p, 30p, 25p and 24p also available in each. Full HD covers the same frame rates, so lower-resolution projects keep the same options.

For slow motion, Full HD capture reaches 240fps, with 200, 120 and 100fps choices too. Footage shot at these rates plays back as slow motion, though it stays at Full HD resolution rather than 4K.

Recording uses H.265 at 10-bit with the OMlog400 colour profile. Ten-bit depth records finer tonal steps than lower bit depths, which helps when grading footage. Check that your editing software accepts H.265 10-bit files before an important shoot.

Stills come from a 20.4 megapixel Micro Four Thirds sensor. That resolution handles prints and online sharing comfortably, though heavy cropping eats into the pixel count quickly.

Autofocus uses 1053 points, giving you many positions to choose from when you want focus on a small, specific part of the scene rather than a broad area.

In-body stabilisation reduces camera shake, which keeps handheld shots sharp at shutter speeds that would otherwise blur, such as indoors or at dusk. It does not stop subject movement, so sports and wildlife still call for faster shutter speeds.

The headline burst rate of 120 frames per second is a maximum figure. It is there to catch a split-second moment, not a rate the camera sustains through a long sequence, so plan your action shots around short bursts.

Weather sealing lets the OM-3 keep working through dust and moisture in changing outdoor conditions. Sealing resists the elements rather than providing a waterproof rating, so the camera still needs care in prolonged heavy weather.

The electronic viewfinder gives an eye-level view for composing shots. Bracing the camera against your face steadies handheld work, and that stance pairs well with the in-body stabilisation, which counters camera shake as well.

The body weighs 413 grams, and weather sealing suits hikes, travel and long days out where conditions can turn. That pairing keeps the camera manageable on foot across a full day of shooting.

There is a single memory card slot. No second card records the same files, so important work exists in one copy until you back it up somewhere else.

In practice, that means carrying spare cards and checking capacity before a shoot, since the card in the camera is your only storage. It is a workable setup, just one that rewards a little planning.

For important assignments, copying files to a computer or a drive soon after the shoot matters more here, because the camera holds no duplicate of your work. Getting your files off the card promptly closes most of that gap.