MINOLTA AF 70-200mm f/2.8 APO G (D) SSM

JP 2004-109559 A Example 1 — Minolta zoom lens system

Patent Example 1: 19 elements / 15 air-spaced optical clusters
Production class: 70-200mm f/2.8 A-mount
Patent f = 71.8 / 105.0 / 195.0 mm; Fno = 2.88
Four inferred AD/ED elements; all-spherical prescription
Inner focus by Gr1R (L4-L5)

Focus Mechanism

Inner-focus model: Gr1R (L4-L5) translates objectward for finite focus. Close-focus spacings are a paraxial reconstruction from Sony's 1.2 m official MFD, not a patent-published focus table.

Optical Elements (19)

ElementTypeGlass
L1Negative MeniscusF2 / S-TIM2 class (620/363; vendor not specified)
L2Biconvex Positive ED493836 - Minolta AD/ED fluorophosphate-type (nd=1.49310, vd=83.58; catalog unresolved)
L3Positive Meniscus493836 - Minolta AD/ED fluorophosphate-type (nd=1.49310, vd=83.58; catalog unresolved)
L4Negative MeniscusE-FD1L (HOYA) / S-TIH1 / N-SF1 class
L5Positive MeniscusH-LAK12 (CDGM equivalent; patent 697565)
L6Biconcave Negative755516 - high-index crown (unresolved)
L7Positive MeniscusFDS90 / N-SF57 / S-TIH53 dense-flint class
L8Biconcave Negative670571 - moderate-index crown (unresolved)
L9Positive MeniscusFDS90 / N-SF57 / S-TIH53 dense-flint class
L10Negative Meniscus755516 - high-index crown (unresolved)
L11Biconvex PositiveN-PSK53A (Schott) / PCD4 / S-PHM52 class
L12Biconvex Positive ED493836 - Minolta AD/ED fluorophosphate-type (nd=1.49310, vd=83.58; catalog unresolved)
L13Negative MeniscusE-LAF7 (HOYA) / N-LAF7 class
L14Negative Meniscus781446 - high-index mid-dispersion glass (unresolved)
L15Biconvex Positive ED493836 - Minolta AD/ED fluorophosphate-type (nd=1.49310, vd=83.58; catalog unresolved)
L16Biconcave NegativeF2 / S-TIM2 class (620/363; vendor not specified)
L17Biconvex PositiveFF5 (HOYA) / S-FTM16 class
L18Negative MeniscusNBFD15-W / NBFD15 (HOYA)
L19Biconvex PositiveLAF3 / S-LAM3 / N-LAF3 class (close, patent νd=47.86)

Analysis

Detailed analysis available in the interactive viewer above.