Industar-55U

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Enlarger medium format lens.

f'=141, 1/4.5 w=28 degrees

Formula from OPAL database.

Radius   thick heig   glass
38.475    5.6   16.1  LZ_TK16
inf       6.35  16.1  
-86.068   2.5   13.8  LZ_LF5
35.29     5.23  13.15 
STOP      2.89  13.5
-271.48   2.0   13.55 LZ_OF1
36.149    7.5   13.75 LZ_TK20
-55.65          13.85