Leica R-Lenses- User Manual
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Table of Contents:
- Page 2 – Chapter 7
- Page 4 – struction
- Page 6 – image 2
- Page 7 – image 5
- Page 8 – Relative Distortion
- Page 9 – image: Oliver Richter
Leica R-Lenses
January 2004
Chapter 7: 28-90 mm lens
__ LEICA VARIO-ELMARIT-R 28-90 MM F/2.8-4.5 ASPH
by Erwin Puts
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Summary
Chapter 7 Leica R-Lenses 1 __Introduction The zoomlens as a species of lens design has had a strangeevolution. The first design seems to be the Vario-Glaukar1:2.8/25-80 mm for 16 mm cine cameras, created bySiemens around 1936. Especially in movies, the idea of asmoothly changing rate of magnificatio...
Chapter 7 Leica R-Lenses 3 __Optical demands and mechanical con- struction The design has 11 elements in 8 groups and employs twoaspherical surfaces, one at the first surface of the front ele-ment and one at the second surface of the last element,incidentally the same as in the original Noctilux 50 ...
of fine detail. Stopping down to 5.6 the performance of thecentre now extends over an image circle of 12 mm diameter (see image 3) . There is no trace of astigmatism and a slight field curvature. Some colour fringing is visible at veryhigh magnifications. Distortion is visible with -3% (barreldistor...
