NIKON ULTRA-MICRO-NIKKOR 29.5mm f/1.2

GB 1,050,055

9 elements / 6 groups
f = 29.5 mm nominal; e-line EFL ≈ 29.11 mm
F/1.2
1/25× reduction objective
all-spherical

Focus Mechanism

Fixed-conjugate 1/25× reduction objective. The BF slider records the infinity-equivalent BFD and the patent β = −0.04 image distance; no internal focus group is present.

Optical Elements (9 physical)

ElementTypeGlass
L1Negative MeniscusS-TIH13 (OHARA catalog equivalent; production supplier unspecified; patent e-line index stored)
L2Biconvex PositiveUnmatched (F5-class patent e-line value; no verified d-line catalog identity)
L3Biconvex PositiveUnmatched low-index crown 449/670 (patent e-line index stored)
L4Biconcave NegativeUnmatched SF8-class dense flint (patent e-line index stored)
L5Biconvex PositiveUnmatched (LAK9-class patent e-line value; no verified d-line catalog identity)
L6Plano-Convex PositiveSK15 / S-BSM15 class barium crown (patent e-line index stored)
L7Negative MeniscusUnmatched (F8-class light flint; patent e-line index stored)
L8Positive MeniscusCalcium fluoride / CaF2 (patent e-line index stored)
L9Positive MeniscusBK7 / S-BSL7 class borosilicate crown (patent e-line index stored)