Leica DM2500, Manual

Page: 119 / 311

41
7. Start-up
Fig. 47 Direct arc image and mirror image in target
position (in reality, the image is less focused)
Centering the Hg 100 W and Xe 75 W
Mercury Lamps
• On the paper, you see the direct arc image
and the mirror image, which in most cases are
not aligned.
• Focus the direct image with the collector
(41.6).
• Use the adjusting buttons to pivot the arc’s
mirror image on the rear side of the lamp
housing (41.2,41.4) to the side or completely
out of the beam path. The arc’s focused im-
age remains visible (Fig. 45).
• Use the adjusting buttons (41.1 and 5) to place
the direct arc image in the middle of the
centering plane, whereby the bright tip of the
arc, the focal spot, should lie slightly outside
the center (Fig. 46).
• Then pivot the arc’s mirror image with the ad-
justing knobs (41.2) and (41.4) and focus it us-
ing the reflector (41.3).
• Use the adjusting knobs (41.2 and 41.4) to ori-
ent the mirror image symmetrically to the di-
rect image (Fig. 47).
The V-shaped irradiation of the direct image
and mirror image arcs can be superimposed.
Caution!
The bright tips of the arcs, the focal spots, must
never be projected onto each other, as this re-
sults in a danger of explosion by overheating.
Fig. 46 Direct arc image in target position
(in reality, the image is less focused)
Fig. 45 Direct arc image focused but not centered
(in reality, the image is less focused)