Micro Four Thirds Equivalent Focal Length
Convert a Micro Four Thirds lens to its full-frame-equivalent field of view using the format's 2× crop factor. The calculator starts with a 25mm Micro Four Thirds lens beside a 50mm full-frame lens.
Compare Micro Four Thirds with full frame
Change any focal length or crop factor to compare the resulting field of view.
Sony α7, Nikon Z6/Z8, Canon EOS R, Panasonic S, Leica SL
OM System / Olympus, Panasonic Lumix G & GH
Where your lenses land
Typical scene ranges are guides, not requirements.
How the conversion works
Micro Four Thirds cameras from OM System/Olympus and Panasonic use a 2× crop factor for full-frame field-of-view comparisons. Multiply the focal length on the lens by two.
For example, a 25mm Micro Four Thirds lens frames like a 50mm lens on full frame. This equivalence describes framing only; exposure settings and the lens's physical focal length do not change.
Micro Four Thirds lens focal length × 2 = full-frame-equivalent focal length
Focal length conversion table
| Micro Four Thirds lens | Full-frame-equivalent field of view |
|---|---|
| 16mm | 32mm |
| 24mm | 48mm |
| 35mm | 70mm |
| 50mm | 100mm |
| 85mm | 170mm |
| 200mm | 400mm |
To work backward from full frame, divide by two: a 24mm full-frame view needs about a 12mm Micro Four Thirds lens.
Worked example: a 12–40mm zoom
A 12–40mm Micro Four Thirds zoom covers a field-of-view range similar to a 24–80mm lens on full frame: 12 × 2 = 24 and 40 × 2 = 80. The lens remains a 12–40mm lens, but the equivalent range makes cross-system framing easier to compare.