The objectives are achromatic interchangeable and 
parfocaled.

  

    
 
    

    Magnification
    

    N.A. (Numeric Aperture)
  
  

    

    01
    

    4X or 5X
    

    0.10
  
  

    

    02
    

    10X
    

    0.25
  
  

    

    03
    

    40X or 45X
    

    0.65 (spring loaded)
  
  

    

    04
    

    100X
    

    1.25 (spring loaded, oil immersion)