Medium Format 44×33 mm Sensor
Direct Answer
The 44×33 Medium Format Sensor (measuring 43.8 × 32.9 mm with an active surface area of ~1441 mm² and a 54.78 mm diagonal) provides approximately 1.67× the physical surface area of a 35mm full-frame sensor. Operating with a 0.79× 'reverse crop factor' and a native 4:3 aspect ratio, it is the digital medium format standard deployed in mirrorless systems by Fujifilm (GFX series) and Hasselblad (X system).
Source: CIPA / Fujifilm GFX System Specifications / Hasselblad Technical Data
Specs
| Width × Height | 43.8 × 32.9 mm (1.724 × 1.295 in) |
| Diagonal Dimension | 54.78 mm |
| Active Surface Area | 1441.0 mm² (approx. 1.67× larger than 35mm full frame) |
| Crop Factor (Relative to 35mm) | 0.79× (Reverse crop / wide-angle focal multiplier) |
| Native Aspect Ratio | 4 : 3 (1.33 : 1) |
| 35mm Equivalent Focal Length | Multiply lens focal length by 0.79 (e.g. 63mm f/2.8 lens ≈ 50mm f/2.2 full-frame equivalent) |
| Flagship Camera Implementations | Fujifilm GFX 100 II / 100S / 50S, Hasselblad X2D 100C / 907X 50C, Pentax 645Z |
The 4:3 Medium Format Aesthetic
At $1441\text{ mm}^2$, the $44 \times 33\text{ mm}$ sensor captures immense dynamic range ($15+\text{ stops}$) and smooth tonal transitions. Its native 4:3 aspect ratio fills traditional editorial magazine covers and $8 \times 10\text{ inch}$ photographic prints with virtually zero cropping waste compared to the narrower $3:2$ ratio of 35mm full frame.