KMZ INDUSTAR 52.39mm f/3.56 (ITMO 2013 Variant 2)

Ivanov / ITMO 2013, Appendix 1.2 Variant 2, pp.50–51; qualified catalog-glass model

4 ELEMENTS / 3 GROUPS
52.3909 mm MODEL EFL
11.8 mm PUBLISHED DIAPHRAGM
FIXED INFINITY MODEL

Focus Mechanism

Fixed infinity source model. No finite-focus motion or production minimum focus distance is established.

Optical Elements (4 physical)

ElementTypeGlass
L1Plano-ConvexUnmatched (TK14; PG&F 2010 d-line proxy; historic melt unconfirmed)
L2Biconcave NegativeLF5 (PG&F coordinate); QF3 (CDGM spectral proxy; historic melt unconfirmed)
L3Negative MeniscusUnmatched (OF1; PG&F 2010 d-line proxy; historic melt unconfirmed)
L4Biconvex PositiveUnmatched (TK14; PG&F 2010 d-line proxy; historic melt unconfirmed)