From: juanreto@gmail.com   
      
   Hi!   
      
   Hope you are all doing fine under this strange circumstances.   
      
   I wanted to ask you two questions.   
      
   1) If we agree that the scratch & dig specification for optical quality of a   
   component is a visual standard comparison with a calibrated paddle (samples   
   with scratchs with different levels of brightness (5,10,20,40,60,80) and digs   
   with different sizes (   
   the same numbers, but different sizes))..   
      
   I wanted to know how is that the inspector measures the length of the scratch   
   in order to apply the following condition of the standard (link below):   
      
   3.5.2.1 Circular element. The combined length of maximum size scratches   
   located on each surface of an optical element shall not exceed one quarter the   
   diameter of that element.   
      
   http://everyspec.com/MIL-PRF/MIL-PRF-010000-29999/MIL_PRF_13830B_252/   
      
   In the paddle (calibrated samples) there are not different lengths of   
   scratches right? just different levels of brightness for each scratch number i   
   suppose ( i don-t have any paddle in my lab)   
      
      
   2) Somebody gave me a filter whose optical quality specification reads as   
   follows:   
      
   5/ 2 x 0.063 (according to MIL PRF 13830, S/D 20-10),   
   target value: 5/1x0.04 (according to MIL PRF 13830, S/D 10-5)   
      
   I understand that the ISO 10110 specifications on the first row, what i don-t   
   understand is the second row, what is the target value?   
      
   Thank you very much in advance.   
      
   JRR(10).-   
      
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