text: **Fig. 1 - Objective Parts**
  
  10. If the image is in focus with the 10x objective, you can select 
   other objectives and observe the specimen even if the fine 
   adjustment knob has not been used by using the following 
   method (See Fig. 1): 
  Aperture of 
  Diaphragm 
  
  1. Unscrew the 40x or 100x objective and remove from 
   turret. 
  2. Remove the mark sleeve. 
  3. Turn the ring on the objective to adjust its parfocal 
   distance. 
  4. Re-insert the objective and compare with the 10x. 
  5. Adjust until the 40x and 100x objectives image is clear. 
  
  **Fig. 2 - Condenser Diaphram Aperture**
  
  **TROUBLESHOOTING**
  
  **USING THE CEDAR OIL**
  
  1. Drop some cedar oil on to the top of the 100x objective when the 
   100x objective is being used. NOTE: To maintain a good quality 
   image, rotate the turret right and left several times to eliminate 
   bubbles in the cedar oil. 
  2. After finishing the observation, wipe off the cedar oil. 
  3. Do not use the 40x objective until you have wiped off all of the 
   cedar oil. 