Samyang's ultra-wide for MFT — the 10mm f/2.8 covering 20mm equivalent.
The Samyang 10mm f/2.8 ED is an ultra-wide manual-focus prime from Samyang for Micro Four Thirds cameras, providing a 20mm full-frame equivalent field of view. ED (extra-low dispersion) glass controls chromatic aberration at this wide focal length.
The lens delivers 10mm (20mm equivalent on MFT) at f/2.8 maximum aperture with ED glass, fully manual focus and aperture, MFT mount, and an MFT image circle.
The 20mm equivalent on MFT is an extreme ultra-wide perspective suited to architecture, landscape, and astrophotography where maximum coverage is the primary goal. The f/2.8 maximum aperture with ED glass enables decent astrophotography performance. MFT's compact form factor keeps this lens small relative to APS-C equivalents.
Check focus ring smoothness. Inspect ED element coating. Test aperture ring detents. Verify MFT mount coupling and no vignetting at f/2.8 on MFT bodies.