RICOH GR LENS 18.3mm f/2.8 (Ricoh GR / GR II) — Optical Cross-Section & Ray Tracing

Home / Lenses / Ricoh / RICOH GR LENS 18.3mm f/2.8 (Ricoh GR / GR II)RICOH GR LENS 18.3mm f/2.8 (Ricoh GR / GR II)US 2013/0321936 A1 EXAMPLE 3 — OHASHI
7 ELEMENTS / 5 GROUPS
f ≈ 18.3 mm
F/2.8
2ω ≈ 76.4°
2 ASPHERICAL SURFACES
Focus MechanismUnit focus — entire lens translates. MFD 0.30 m normal, 0.10 m macro mode.
Optical Elements (7)ElementTypeGlass
L1Neg. Meniscus (1× Asph)FCD1 / M-FCD1 (HOYA PGM; patent M-FCD1)
L2Negative MeniscusE-FD8 (HOYA)
L3Negative MeniscusS-TIH53 / FDS90 class (847238; patent HOYA FDS90)
L4Biconvex PositiveTAFD30 (HOYA)
L5Biconvex PositiveTAFD30 (HOYA)
L6Biconcave NegativeE-FD8 (HOYA)
L7Neg. Meniscus (1× Asph)821427 - HOYA M-TAFD51 (PGM; patent Pg,F=0.5642)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Neg. Meniscus (1× Asph)	FCD1 / M-FCD1 (HOYA PGM; patent M-FCD1)
L2	Negative Meniscus	E-FD8 (HOYA)
L3	Negative Meniscus	S-TIH53 / FDS90 class (847238; patent HOYA FDS90)
L4	Biconvex Positive	TAFD30 (HOYA)
L5	Biconvex Positive	TAFD30 (HOYA)
L6	Biconcave Negative	E-FD8 (HOYA)
L7	Neg. Meniscus (1× Asph)	821427 - HOYA M-TAFD51 (PGM; patent Pg,F=0.5642)