Spherical, optically worked, highly polished with ground edges.
                     F     O      C      A      L          L      E      N      G     T      H


  

    

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    Dia.
    

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    C
    

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    01
    
38mm
    

    5cm
    

    10cm
    

    15cm
    

    20cm
    

    25cm
    

    30cm
    

    40cm
    

    50cm
    

    100cm
  
  

    

    02
    
50mm
    

    5cm
    

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    15cm
    

    20cm
    

    25cm
    

    30cm
    

    40cm
    

    50cm
    

    100cm
  
  

    

    03
    
60mm
    

     
    

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    25cm
    

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    40cm
    

    50cm
    

    100cm
  
  

    

    04
    
75mm
    

     
    

    10cm
    

    15cm
    

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    25cm
    

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    50cm
    

    100cm