Olympus Cameras & the Micro Four Thirds (MFT) Mount

Olympus (now OM Digital Solutions) co-created the Micro Four Thirds (MFT) system with Panasonic in 2008—a mirrorless mount standard that defines their interchangeable-lens cameras.

Mount Specs

• Flange focal distance: 19.25 mm (very short → compact bodies)
• Mount diameter: ~38 mm (inner), 44 mm (outer)
• Sensor: 17.3 × 13 mm (4/3" type, 2× crop vs. full-frame)
• Contacts: 11-pin digital communication

Benefits

• Compactness: Smaller lenses & bodies vs. APS-C/FF
• Lens sharing: Panasonic, Olympus, Sigma, Laowa, Voigtländer, etc.
• IBIS synergy: Olympus's industry-leading 5-axis stabilization works with any MFT lens
• Adaptability: Short flange → adapters for almost any legacy lens (Leica M, Canon FD, vintage)

Olympus/OM System Lens Lineup

• PRO f/1.2 primes (17, 25, 45mm)
• PRO zooms (7–14, 12–40, 40–150 f/2.8)
• Compact primes (14–42 EZ, 25/1.8, 45/1.8)
• Super-tele: 150–400mm f/4.5 TC1.25x (800mm equiv.)

Current Status

OM Digital continues MFT development (OM-1, OM-5). Panasonic focuses on video (GH6, S-series full-frame). MFT remains the most mature mirrorless lens ecosystem.