Leica R-Lenses Manuale Utente

Leica R-LensesJanuary 2004Chapter 7: 28-90 mm lens__ LEICA VARIO-ELMARIT-R 28-90 MM F/2.8-4.5 ASPHby Erwin Puts

Chapter 7 Leica R-Lenses 10__Flare propertiesI made a special study of the flare properties of the lens, asthis is the one area where lenses have to g

Chapter 7 Leica R-Lenses 1__IntroductionThe zoomlens as a species of lens design has had a strangeevolution. The first design seems to be the Vario-Gl

Chapter 7 Leica R-Lenses 2__ZoomrangeThe choice of focal lengths is very practical. Many yearsago Canon has analysed thousands of photographs andconcl

Chapter 7 Leica R-Lenses 3__Optical demands and mechanical con-structionThe design has 11 elements in 8 groups and employs twoaspherical surfaces, one

selected because the surface reacts quite well to the blackanodizing process (see image 1). The result of all this effort is a lens with a very smooth

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 o

Chapter 7 Leica R-Lenses 70 5 10 15 20Y'[mm]020406080100[%]Aperture Stop 2.8 0 5 10 15 20Y'[mm]020406080100[%]Aperture Stop 5.6 image 5image

Chapter 7 Leica R-Lenses 80 5 10 15 20Y'[mm]020406080100[%]Aperture Stop 4.0 0 5 10 15 20Y'[mm]020406080100[%]Aperture Stop 5.6 image 11imag

Chapter 7 Leica R-Lenses 9This is a lens with amazing characteristics. It offers outstan-ding quality and can be compared very favourably to thefixed