Aperture Diaphragm; Stage; Click Stop Lever - Optika Italy B-1000 Serie Manual De Instrucciones

9.13

Aperture diaphragm

• The Numerical Aperture (N.A.) value of the
aperture diaphragm affects the image contrast.
Increasing or reducing this value one can vary
resolution, contrast and depth of focus of the
image.
• With low contrast specimens set the numerical
aperture value ① (printed on the condenser ring)
to about 70%-80% of the objective's N.A. (Fig. 35)
If necessary, remove on eyepiece and, looking
into empty sleeve, adjust the condenser's ring in
order to obtain an image like the one in fig. 36.
Example: with objective PLAN 40x / 0,65 set the
scale to 0.65 x 0.8 = 0,52
9.14

Stage

• The rotatable stage is equipped with an X-Y
mechanical stage applied directly on the stage
surface.
• The movement is made by means of the two
knobs ① (Fig. 37) that allow to move the sample
without affecting the rotation on the 360° of the
stage itself.
1. Open the spring arm of the slide holder ② and
place from the front the slide on the stage.
• Gently release the spring arm of the slide
holder.
• A sudden release of the spring arm could
cause the falling of the slide.
9.14.1 45° click stop lever
• This lever is used to enable or disable the 45°
click stop function during stage rotation.
• When the function is enabled, the operator will
hear a "click" every 45° by rotating the stage.
1. Pull the lever ③ towards the front of the micro-
scope to enable the function. (Fig. 38)
2. Push the lever towards the rear to disable the
function.
APERTURE
DIAPHRAGM
FIELD OF VIEW
①
①
②
③
DISABLED
Page 22
①
F ig. 35 F ig. 35
70-80%
30-20%
F ig. 36 F ig. 36
F ig. 37 F ig. 37
ENABLED
F ig. 38 F ig. 38