Leica Summilux-M 21 mm f/1.4 ASPH. rangefinder lens 11647: is the first and only 21mm small camera lens with this lens speed. The outstanding image quality, very large image angles, and compact dimensions make this Leica Camera Accessory a particularly versatile performer. At full aperture, the depth of field (DOF) is extremely shallow. As a result, in close-ups the main subject can be separated effectively from the background to create very expressive photographs. At a medium stop, the focal range is so great that entire scenes can be reproduced sharply. Because of the floating element, the very high resolution is retained even in the close-up range. Vignetting and distortion are both corrected excellently for a lens of this speed. A patented, rectangular lens hood fits Series VIII filters.
The Leica Summilux-M 21 mm f/1.4 ASPH. rangefinder lens extends Leica 's series of high speed M lenses into the wide-angle range. Camera accessory by Leica offers excellent performance over the entire image field even at full stop and in the close-up range thanks to a "floating element". Stopping down to 2.8 leads to an absolutely outstanding image quality, in fact, in comparison to the Elmarit lens of the same focal length, its rendition is slightly more uniform across the image field. The vignetting typical of every optical system is naturally more apparent with a super wide angle lens, particularly a high speed one like this, than on standard lenses or those with a long focal length. At full stop with the 35mm format, its maximum - i.e. in the corners of the image - is around 3.2 aperture stops or, with the Leica M8 models and their slightly smaller format, around 1.9 aperture stops. Stopping down to 2.8 visibly reduces this light fall-off towards the image edges to 1.7 or 0.8 aperture stops. Stopping down further does not bring any noticeable additional reduction, as all that remains is essentially the natural vignetting. The maximum distortion of the lens is 2.3%, which in practical terms is negligible for the majority of photographic applications. A total of ten lens elements are used to achieve this exceptional performance. To correct color aberrations, five of these are made of glass types with anomalous color dispersion (partial dispersion), while a further two have spherical surfaces. To maintain performance in the close-up range, one group towards the rear of the optical system is a "floating element" that moves independently of the rest of the mechanism.
Leica Elmarit-M 21mm/ f2.8 ASPH, E55 Wide-Angle Lens is compact extreme wide-angle lens that produces outstanding contrast and detail rendition at full aperture. The pro-verbial Leica image quality is preserved even in the close-up range. Distortion is minimal and negligible in photographic practice. At f/5.6 this lens is free of artificial vignetting. With all these qualities, it is ideally suited for dramatic effects with monumental foregrounds and strongly receding backgrounds with distant horizons. Because an extremely large depth-of-field is already achieved with a slightly stopped-down aperture, sharp dramatic pictures can be made during live reportage photography.
- Available Models of Leica 21mm Wide-Angle Lenses:
- 11647: Leica Summilux-M 21mm / f 1.4 ASPH, S8 Lens