NIKON Gugutto Macro 120mm f/4.5 — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON Gugutto Macro 120mm f/4.5NIKON Gugutto Macro 120mm f/4.5US 5,764,425 Example 4 — Koichi Ohshita / Nikon
3 elements / 2 groups
120mm f/4.5 fixed aperture
US5764425 Example 4 scaled ×1.2
all-spherical telephoto macro
Focus MechanismUnit focus by whole optical assembly extension. Standard Gugutto Macro configuration focuses to about 0.64 m at approximately 1/3×; Sarani Gugutto close-up reassembly is not modeled here.
Optical Elements (3)ElementTypeGlass
L1Biconvex PositiveQ-SK55S / L-BAL35 class (589/611, uncertain 1995 melt)
L2Biconcave Negative804339 - dense flint (E-LAFH2 code match; patent nd=1.80384, vd=33.89)
L3Negative Meniscus (convex to image)Q-SK55S / L-BAL35 class (589/611, uncertain 1995 melt)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Biconvex Positive	Q-SK55S / L-BAL35 class (589/611, uncertain 1995 melt)
L2	Biconcave Negative	804339 - dense flint (E-LAFH2 code match; patent nd=1.80384, vd=33.89)
L3	Negative Meniscus (convex to image)	Q-SK55S / L-BAL35 class (589/611, uncertain 1995 melt)