key specs of Leica DG Summilux 9mm F1.7 ASPH lens:
- Lens configuration: 12 elements in 9 groups (2 aspherical lenses, 2 ED lenses, 1 UHR lens)
- Number of diaphragm blades: 7 (circular diaphragm)
- Shortest shooting distance: 9.5cm
- Maximum shooting magnification: 0.25x (35mm equivalent 0.5x)
- Filter diameter: 55mm
- Size: φ60.8 x 52mm
- Weight: 130g
- Dustproof and splashproof, low temperature resistant to -10 degrees
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