| Lumix 20mm | |
| Key features | |
|---|---|
| Maker: | Panasonic |
| Image stabilization: | No |
| Macro capable: | No |
| Technical data | |
| Focal length: | 20mm |
| Focal length (35mm equiv.): | 40mm |
| Aperture (max/min): | f/1.7 |
| Construction: | 5 groups / 7 elements |
| Close focus distance: | 0.2 m (7.87 in) |
| Max. magnification: | 0.13 |
| Physical | |
| Max. diameter: | 63 mm (2.48 in) |
| Max. length: | 25.5 mm (1.0 in) |
| Weight: | 100g (3.53 oz) |
| Filter diameter: | 46mm |
| Accessories | |
| Angle of view | |
| History | |
| Introduced: | 2009 |
| Retail info | |
The Panasonic Lumix 20mm f/1.7 lens is a pancake-style prime lens for Micro Four Thirds system cameras. In the Micro Four Thirds format, it is slightly wider than normal. It was the prime-lens option available with the GF1.
The lens is "focus by wire"- the focusing ring sends commands, while the actual actuation is via a motor, even for manual focus. Focusing is internal- the front element does not rotate, allowing the consistent use of polarized filters. The 46mm thread lets a Micro Four Thirds user share filters between it, the Panasonic 14mm, Panasonic Leica 25mm, and Panasonic Leica 45mm lenses.
The lens is very favorably reviewed[1] [2] , including descriptions as a "must have"[3] [4] [5] [6] or "must own"[2] lens. Criticisms include the use of software correction of distortion, and that the focusing motor is slower and noisier than lenses intended for video ("MSC"- movie and stills compatible).