CANON EF 28-200mm f/3.5-5.6 USM

JP 2001-350095 A, Numerical Example 1 — Makoto Mitsusaka

16 GLASS SUBSTRATES / 12 GROUPS
DESIGN 28.92-193.14 mm
MODELED f/3.63-5.88
2 ASPHERICAL SURFACES
G2 INNER FOCUS

Focus Mechanism

CONSTRAINED_RECONSTRUCTION: G2 moves alone toward the object; D5 + D15 is conserved at each zoom station; close states are code-solved for a fixed image plane and a 0.45 m object-to-image distance. The patent publishes infinity states only.

Optical Elements (16 physical; 17 modeled media)

ElementTypeGlass
L1Negative MeniscusS-TIH53WN (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L2Positive MeniscusS-BSM15 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L3Positive MeniscusS-BSM15 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L4rNeg. Meniscus (1× Asph)Unmatched (bonded thin layer; source n=1.51421, ν=51.4; no catalog row within tolerance)
L4Negative MeniscusS-LAH60 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L5Biconcave NegativeS-LAH55V (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L6Biconvex PositiveS-TIH53WN (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L7Biconcave NegativeS-LAH65V (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L8Biconvex PositiveS-TIH53WN (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L9Biconvex PositiveS-NSL3 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L10Biconvex PositiveS-NSL36 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L11Negative MeniscusS-TIH53WN (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L12Positive MeniscusS-TIH10 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L13Negative MeniscusS-LAH58 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L14Biconvex Positive (1× Asph)S-BAL42 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L15Biconvex PositiveS-NSL3 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)
L16Negative MeniscusS-LAH53 (spectral proxy; d-line inferred from printed coordinates; supplier, melt and chemistry unspecified)