Anybody know the correct name for…….

Chief_1975

Well-known member
the piece of film with a pattern on that can be overlaid on top of halftones to detect what lpi and angle is by showing a moire pattern ?

I have been googling for 30 mins with no joy !!
 
Mine is called a Screen Pattern Analyzer and Rescreening Key (SPARK)
From Graphic Arts Research Center Rochester Institute of Technology

Still have my original from 30 years ago...
 
I use a Beta-Viewer, 100x, with reticule....measure it and do the math.
Didn't have a screen analyzer in this shop. Was surprised how easy measuring it was.
 
   
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