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Photographic lens From Wikipedia, the free encyclopedia
The Panasonic Leica D Summilux Asph 25mm F1.4 is an interchangeable camera lens announced by Panasonic on March 7, 2007.
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Maker | Panasonic |
---|---|
Lens mount(s) | Four Thirds |
Technical data | |
Type | Prime |
Focus drive | Micromotor |
Focal length | 25 mm |
Focal length (35mm equiv.) | 50 mm |
Aperture (max/min) | f/1.4–16 |
Close focus distance | 0.38 metres (1.2 ft) |
Max. magnification | 0.18 |
Diaphragm blades | 7 |
Construction | 10 elements in 9 groups |
Features | |
Manual focus override | No |
Weather-sealing | No |
Lens-based stabilization | No |
Aperture ring | Yes |
Physical | |
Max. length | 75.0 millimetres (2.95 in) |
Diameter | 77.7 millimetres (3.06 in) |
Weight | 510 grams (1.12 lb) |
Filter diameter | 62 mm |
Accessories | |
Lens hood | petal shaped hood |
Angle of view | |
Diagonal | 47° |
History | |
Introduction | 2007 |
The lens uses 10 elements in 9 groups, arranged as a double Gauss type, with one aspherical, three extra-low dispersion (ED), and one super ED element. It was announced in March 2007, with availability starting that April.[1]
As reviewed in 2010, the lens exhibited little distortion and offered close to maximum resolution wide-open, improving slightly at f/2.[2] Resolution on the frame's edge was weaker, though, due to chromatic aberration and visible coma at maximum aperture.[3]
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