Leica DM1000 LED manual Operation Color-coded Condenser, Field diaphragm

8. Operation

Color-coded Condenser

The color markings on the condenser (46.2) correspond to the color rings of the objectives. When changing objectives, a suitable aperture diaphragm setting can easily be found by setting it to the matching color marking (corresponds to 2/3 of the objective-side aperture).

Fig. 46 CL/PH condenser

1Slot for light rings, etc.

2Color coding

3Aperture diaphragm

4Filter holder

5Field diaphragm

1

2

3

4

5

Attention:

The aperture diaphragm in the illumination light path is not for setting the image brightness. Only the rotary brightness adjustment knob or the neutral density filter should be used for this.

An aperture diaphragm in the objective is normally fully opened. The reduction in image brightness caused by stopping down results in:

Greater depth of field Less coverglass sensitivity Suitability for darkfield Change in contrast

8.9 Field diaphragm

The field diaphragm (46.5) protects the specimen from unnecessary warming and keeps all light not required for image formation away from the object to enable greater contrast. It is therefore only opened just wide enough to illuminate the viewed or photographed object field. A change in magnification therefore always necessitates matching of the field diaphragm.

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