Related Manuals for Leica R-Lenses
Summary of Contents for Leica R-Lenses
- Page 1 Leica R-Lenses by Erwin Puts January 2004 Chapter 7: 28-90 mm lens __ LEICA VARIO-ELMARIT-R 28-90 MM F/2.8-4.5 ASPH...
- Page 2 This new Leica zoomlens has a number of innovative featu- res that elevates zoomlens design to a new level. It is the first Leica zoomlens that has a zoom range above a ratio of 1:3, to be exact it is 1:3.214, very close to the magic mathematical number pi (3.14…).
- Page 3 Leica lens would cover the most used range of focal lengths with one zoom movement. This Leica lens is a fine addition to the expanding range of Vario-lenses, but it cannot be a jack of all trades.
- Page 4 The lens has three moving groups that are being guided in milled slots with a precision of 0.010 to 0.005 mm. The challenge for the Leica engineers was to design a lens that had to fit into three dimensions of requirements: per- formance, haptics and cosmetics.
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Page 5: _Optical Considerations
Leica lenses and has now been brought to a new level. The assembly and adjustment instructions are part of the final lens design and the design is adapted to what is the best assembly practice. - Page 6 Often the behaviour of zoomlenses can be characterized as good in the middle range and weaker at both extremes (see image 15 and 16) . Leica R-Lenses Aperture Stop 2.8 image 2 Aperture Stop 5.6 image 3...
- Page 7 Chapter 7 Aperture Stop 2.8 image 5 Aperture Stop 5.6 image 6 Relative Distortion image 7 Y'[mm] image 8 Y'[mm] image 9 Y'[mm] image 10 Leica R-Lenses Aperture Stop 3.4 Y'[mm] Aperture Stop 5.6 Y'[mm] Relative Distortion Y'[mm]...
- Page 8 Chapter 7 Aperture Stop 4.0 image 11 Aperture Stop 5.6 image 12 Relative Distortion image 13 Y'[mm] image 14 Y'[mm] image 15 Y'[mm] image 16 Leica R-Lenses Aperture Stop 4.5 Y'[mm] Aperture Stop 5.6 Y'[mm] Relative Distortion Y'[mm]...
- Page 9 35 mm). In this range, focus constancy is abolutely spot on. Current Leica lenses score high marks in the areas of contrast and definition and reproduction of very fine detail. These cha- racteristics can be inferred from the published MTF graphs, as long as you try not to read too much out of these graphs.
- Page 10 The image quality of the LEICA VARIO-ELMARIT-R 28-90 MM F/2.8-4.5 ASPH is generally above what one expects from high grade fixed focal lengths and the focal length range secures it a premium role in the Leica R lens range. image: Oliver Richter...