VLE 2 Optical Instruments I

Different hole diameters

source: Demtröder, Experimentalphysik 2

With pinhole camera image, luminous text with different hole diameters.

31

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany

Comparison with lens camera

Pinhole camera

Lens camera

source: http://de.wikipedia.org/wiki/Lochkamera

32

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany

Basic principle

Camera

Objective

Aperture with variable diameter

Film or CCD-chip

34

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany

Reflex camera

source: Nikon

source: http://de.wikipedia.org/wiki/Spiegelreflex

36

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany

Principle

Principle:

The light passes into the camera through the objective (1) and is reflected by a reflex mirror (2). Then the light is projected on the focussing screen (5). With a focusing lens/condeser (6) and the reflection through the pentaprism (7) the light is imaged on the eye-piece (8). While imaging the mirror flip upwards and the focal plan shutter (3) opens. The scene is then image on the film (4).

source: Wikipedia

37

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany

Zoom lens

source: http://de.wikipedia.org/wiki/Zoomobjektiv

source: http://de.wikipedia.org/wiki/Zoomobjektiv

38

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany

Principle zoom lens

Example for zoom lenses:

Two to each other fixed defocussing lenses which can be moved between two fixed focussing lenses.

Moving of L2 changes the magnification V,

no change of the image plane and the objective position.

Object distance a >> f : V~f

source: Demtröder, Experimentalphysik 2

39

Prof. M. Schmidt

Institute of Photonic Technologies, Univ. Erlangen, Germany