Optika Italy B-380 Serie Manuel D'instructions page 20

10.5 Focus lock lever
The upper limit knob has two functions: prevent the contact
between slide and objective and acts as focus memory.
1. After focusing the specimen, rotate the knob
(Fig. 14). In this way the focus upper limit is set.
2. Lower the stage with coarse focus knob and replace the
specimen.
3. Raise again the stage up to the upper limit: specimen will be
in approximate focus and will need a fine adjustment to get
the proper focus. Fine focus movement is not affected by the
coarse focus lock.
• To unlock, move the knob in the opposite direction to the
one used for the lock.
10.6 Stage
Stage accepts standard slides 26 x 76 mm, thickness 1,2 mm
with coverslide 0,17mm. (Fig. 15)
It is possible to place two slides side by side on the stage.
1. Open the spring arm of the slide holder
the slides on the stage.
2. Gently release the spring arm of the slide holder.
• A sudden release of the spring arm could cause the fall-
ing of the slide.
10.7 Condenser centering
10.7.1 Centering without field diaphragm
The condenser is installed and pre-centered in the factory.
To remove the condenser use an Allen wrench 1.5 mm and oper-
ate on the fixing knob placed on the right side of the condenser
holder.
Should a new centering is needed, operate in this way:
1. Insert 4x objective in the light path (in case 4x is not available
use the lower magnification available).
2. Focus the specimen.
3. Close the aperture diaphragm using the ring ③, moving the
ring to the value "4" related to the 4x objective. (Fig. 16)
4. Raise the condenser to the upper limit using the height ad-
justment knob placed on the left side of the condenser
④
holder.
5. Center the condenser using the centering screws ⑤ until the
field of view is evenly illuminated (in the field of view no dark
and bright areas must be noticed).
6. Fully open the diaphragm.
and lock it
①
and place frontally
②
Page 20
①
②
④
③
UNLOCK
LOCK
F ig. 14 F ig. 14
F ig. 15 F ig. 15
⑤
F ig. 16 F ig. 16