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
