Optika Italy IM Serie Manual De Instrucciones página 15

3. Rotate the two centering screws ② to bring the bright spot in
the center of the field of view. (Fig. 25)
4. Gradually open the diaphragm by inserting the lever ①.
• The diaphragm is centered when the diaphragm image is
symmetrical to the field of view. (Fig. 26)
5. In normal use, open the diaphragm until it circumscribes the
field of view.
10.8 Effects of the field diaphragm
Field diaphragm adjusts the illuminated area to obtain a high
contrast image.
Set the diaphragm according to the objective in use until it
circumscribes the field of view, in order to eliminate unnecessary
light to eyepieces.
10.9 Centering the aperture diaphragm
1. Pull the field diaphragm lever ③ "AS" to fully close the
aperture diaphragm. (Fig. 27)
2. Remove one eyepiece.
3. While looking into the empty eyepiece sleeve, use the
provided Allen wrenches into the centering screws ④ to
bring the bright spot in the centre of the field of view. (Fig. 28)
4. The diaphragm is centered when the diaphragm image is
symmetrical to the field of view.
④
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②
③
④
F ig. 25 F ig. 25
F ig. 26 F ig. 26
F ig. 27 F ig. 27
F ig. 28 F ig. 28