Version 2017-01-19 for GI use
4. Turn screw a counter-clockwise until the other edge is found. Do this while
counting the number of turns, to know where the center is.
5. Use screw b (first completely in until stop. Be careful not to … to prevent the
diaphragm to fall into the column ???
6.
FRESNEL FRINGES ADJUSTMENT
1. Insert a carbon test grid (ASK Geert-Jan). Put HT and Fil on.
2. Go to low magnification to search a nice piece of membrane
3. Low mag with level f directed to the left
4. Check astigmatism by defocussing a little bit (knob 7)
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