Leica DM IRB manual Method, Lamphousing 106 z L with halogen lamp, Xe and Hg lamps

5.Using an Allen key, adjust the screw for hori- zontal adjustment (68.3) until the pale stripe of the filament image is in the centre of the pupil.

6.Then adjust the screw for vertical adjustment (68.2) to align the filament image vertically in the centre of the pupil.

Method 3:

Centration in the plane of the specimen stage

1.Put a piece of paper or non-shiny piece of Leica packaging on the specimen stage and roughly focus the surface with a low-mag- nification objective.

2.Set the field and aperture diaphragms at the middle position.

3.Make a dot or cross on the centration area with a felt or ball point pen and slide it into the centre of the spot of light. Fix with the specimen clip if necessary.

4.Screw out the objective or turn an empty nosepiece position into the light path.

Fig.Ê 70ÊLamphousingÊ 106 z with Hg 100 W lampÊ

1 Lamp adjustment, vertical, 2 Reflector adjustment, vertical, 3 Focusing of the reflector image, 4 Reflector adjustment, ho- rizontal, 5 Lamp adjustment, horizontal, 6 Collector focusing, 7 Cover fixing screw

5.Using the centring screws, slide the image of the filament into the middle of the centration area marked with a dot or cross, as described in Method 2.

Lamphousing 106 z L with halogen lamp, Xe and Hg lamps

(switch gas discharge lamps on and off at sepa- rate power units)

For lamphousing 106 z the direct lamp image and the reflection of the reflector are focused separately and aligned to each other.

Either of the above methods can be used for imaging the lamp filament or arc.

Centration of 12 V 100 W halogen lamp

Move the reflection of the filament to the side or entirely out of the light path by adjusting the centring screws on the back of the lamphousing (70.5, 71). Focus the direct image of the filament with the collector adjustment (70.1)

Then, using the centring buttons, adjust the image of the filament until the centration area or rear focal plane of the objective is half filled (Fig. 71b).

Then focus the reflection of the filament with the centring buttons for the reflector adjustment and align symmetrically to the direct image (Fig. 71c).

7 6 1 5

2

3

4

Risk of glare with gas discharge lamps! Use neutral density filter (see p. 56).

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