User Guide
8
120
Series
Parts
Definition of Parts 
Base Lens
Directs the light source towards the slide 
Coarse Focusing Knob 
Used to initially bring the slide into the sight and focus 
Condenser & Iris Diaphragm 
Controls the amount of light that hits the slide 
Condenser Screw
Screws the condenser in place, securing it to the mechanical stage 
Dimmer 
Controls the amount of light that escapes from the base lens 
Diopter 
Allows the focus to be perfected for both eyes, independent of each other 
Fine Focusing Knob 
Used to refine focus to clear image 
Limit Stop Screw 
Limits the upward movement of the mechanical stage in order to avoid damaging the slide and objective 
Mechanical Stage
Mechanically moves the slide along an X and Y axis for optimal positioning 
Nosepiece 
Houses the objective lenses 
Rotating Siedentopf Head 
Adjusts eyepieces to fit the distance between the user’s eyes for added comfort 
Tension Knob 
Adjusts the tension of the focusing knobs 










