CANON RF 10-20mm f/4 L IS STM — Optical Cross-Section & Ray Tracing

Home / Lenses / Canon / CANON RF 10-20mm f/4 L IS STMCANON RF 10-20mm f/4 L IS STMUS 2024/0045184 A1↗ — Makoto Nakahara
16 ELEMENTS / 12 GROUPS
f ≈ 10.33–19.39 mm
F/4.08–4.12
2ω ≈ 122.7°–96.3° (PARAXIAL)
5 ASPHERICAL SURFACES
Focus MechanismRear focus by the single positive lens E6 (unit L2) behind the stop, moving toward the image for close focus; L1, stop, L3 and L4 stay fixed during focusing. The patent publishes infinity states only: close-focus spacings are a constrained reconstruction solved paraxially for an object 0.25 m from the image plane at each zoom station (L2 travel ≈ 2.25–2.43 mm). Image stabilisation shifts E14 (not modeled).
Optical Elements (16 physical)ElementTypeGlass
E1Neg. Meniscus (2× Asph)S-BAL42 / L-BAL42 (OHARA) class — 583594 barium crown
E2Negative MeniscusTAFD35 (HOYA) / H-ZLaF4LA class — 911352 dense lanthanum flint
E3Negative MeniscusFCD515 / FCD505 (HOYA) class — 593686 fluorophosphate crown
E4Biconcave NegativeS-FPL55 (OHARA) class — 439947 fluorophosphate (Super UD class)
E5Biconvex PositiveTAFD30 (HOYA) / S-LAH58 (OHARA) class — 883408 lanthanum flint
E6Biconvex PositiveS-NBH8 (OHARA) / N-KZFS8 (Schott) class — 720347 short flint
E7Negative MeniscusS-NPH1 (OHARA) / FD225 (HOYA) class — 808228 dense flint
E8Positive MeniscusS-NBH52V (OHARA) class — 673383
E9Biconcave NegativeTAFD30 (HOYA) / S-LAH58 (OHARA) class — 883408 lanthanum flint
E10Positive MeniscusE-FDS1 (HOYA) / N-SF66 (Schott) class — 923209 dense flint
E11Biconvex Pos. (1× Asph)S-FPL51 (OHARA) / FCD1 (HOYA) class — 497815 fluorophosphate (UD class)
E12Negative MeniscusTAFD65 (HOYA) / H-ZLaF96 (CDGM) class — 051269 lanthanum dense flint
E13Biconvex PositiveS-FPL51 (OHARA) / FCD1 (HOYA) class — 497815 fluorophosphate (UD class)
E14Negative MeniscusTAFD30 (HOYA) / S-LAH58 (OHARA) class — 883408 lanthanum flint
E15Neg. Meniscus (2× Asph)L-LAH85V (OHARA low-Tg) class — 854404 lanthanum flint
E16Positive MeniscusS-FPL51 (OHARA) / FCD1 (HOYA) class — 497815 fluorophosphate (UD class)

Element	Type	Glass
E1	Neg. Meniscus (2× Asph)	S-BAL42 / L-BAL42 (OHARA) class — 583594 barium crown
E2	Negative Meniscus	TAFD35 (HOYA) / H-ZLaF4LA class — 911352 dense lanthanum flint
E3	Negative Meniscus	FCD515 / FCD505 (HOYA) class — 593686 fluorophosphate crown
E4	Biconcave Negative	S-FPL55 (OHARA) class — 439947 fluorophosphate (Super UD class)
E5	Biconvex Positive	TAFD30 (HOYA) / S-LAH58 (OHARA) class — 883408 lanthanum flint
E6	Biconvex Positive	S-NBH8 (OHARA) / N-KZFS8 (Schott) class — 720347 short flint
E7	Negative Meniscus	S-NPH1 (OHARA) / FD225 (HOYA) class — 808228 dense flint
E8	Positive Meniscus	S-NBH52V (OHARA) class — 673383
E9	Biconcave Negative	TAFD30 (HOYA) / S-LAH58 (OHARA) class — 883408 lanthanum flint
E10	Positive Meniscus	E-FDS1 (HOYA) / N-SF66 (Schott) class — 923209 dense flint
E11	Biconvex Pos. (1× Asph)	S-FPL51 (OHARA) / FCD1 (HOYA) class — 497815 fluorophosphate (UD class)
E12	Negative Meniscus	TAFD65 (HOYA) / H-ZLaF96 (CDGM) class — 051269 lanthanum dense flint
E13	Biconvex Positive	S-FPL51 (OHARA) / FCD1 (HOYA) class — 497815 fluorophosphate (UD class)
E14	Negative Meniscus	TAFD30 (HOYA) / S-LAH58 (OHARA) class — 883408 lanthanum flint
E15	Neg. Meniscus (2× Asph)	L-LAH85V (OHARA low-Tg) class — 854404 lanthanum flint
E16	Positive Meniscus	S-FPL51 (OHARA) / FCD1 (HOYA) class — 497815 fluorophosphate (UD class)