Optika Italy B-380 Serie Mode D'emploi page 20

9.5 Focus lock lever
The upper limit knob has two functions: prevent the
contact between slide and objective and acts as
focus memory.
1. After focussing the specimen, rotate the knob ①
and lock it (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.
9.6 Stage
Stage accepts standard slides 26 x 76 mm, thickness
1,2 mm with coverlside 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 ② and
place frontally the slides on the stage.
2. Gently release the spring arm of the slide holder.
• A sudden release of the the spring arm could
cause the falling of the slide.
9.7 Condenser centering
9.7.1 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 operate 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 availa-
ble).
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 adjustment knob ④ placed on the left side
of the condenser 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.
①
②
④
③
Page 20
Fig. 14
Fig. 15
⑤
Fig. 16