MINOLTA MD 50mm f/1.7 — Optical Cross-Section & Ray Tracing

Home / Lenses / Minolta / MINOLTA MD 50mm f/1.7MINOLTA MD 50mm f/1.7JP S60-111215 A↗ — Sho Fukushima
6 ELEMENTS / 5 GROUPS
DESIGN f = 51.50 mm
DESIGN F/1.73
ALL SPHERICAL
PATENT 2ω = 45.6°
Focus MechanismUnit focus: the whole lens moves forward as one piece. JP S60-111215 A describes this taking lens as a whole-extension type and prints its extension to closest focus as dM = 7.65 mm. Added to the computed infinity back focus of 36.884 mm, that gives 44.534 mm and an object-to-image distance of about 450 mm, in line with the 0.45 m minimum focus of the production lens.
Optical Elements (6 physical)ElementTypeGlass
L1Positive MeniscusLAC10 (HOYA, coordinate equivalent)
L2Positive MeniscusLAC13 (HOYA, coordinate equivalent)
L3Negative MeniscusSF5 (SCHOTT, coordinate equivalent)
L4Biconcave NegativeS-TIM1 (OHARA catalog equivalent; production supplier unspecified)
L5Biconvex PositiveLAC13 (HOYA, coordinate equivalent)
L6Biconvex PositiveUnmatched (781446 high-index mid-dispersion glass; no compatible public coefficient row)

Element	Type	Glass
L1	Positive Meniscus	LAC10 (HOYA, coordinate equivalent)
L2	Positive Meniscus	LAC13 (HOYA, coordinate equivalent)
L3	Negative Meniscus	SF5 (SCHOTT, coordinate equivalent)
L4	Biconcave Negative	S-TIM1 (OHARA catalog equivalent; production supplier unspecified)
L5	Biconvex Positive	LAC13 (HOYA, coordinate equivalent)
L6	Biconvex Positive	Unmatched (781446 high-index mid-dispersion glass; no compatible public coefficient row)