PENTAX DA 35mm f/2.8 Macro Limited — Optical Cross-Section & Ray Tracing

Home / Lenses / Pentax / PENTAX DA 35mm f/2.8 Macro LimitedPENTAX DA 35mm f/2.8 Macro LimitedUS 7,715,118 B2 Example 1 — Hoya / Koji Kato
9 elements / 8 groups
35 mm marketed; 34.41 mm patent EFL
f/2.8 marketed; 1:2.88 patent FNO
1:1 macro; 0.139 m MFD
APS-C, Pentax KAF / K mount
All-spherical
Focus MechanismFront assembly focus: groups G10 and G20 move objectward together while G30 remains fixed. Modeled by D13 increasing from 1.00 mm at infinity to 24.13 mm at 1:1.
Optical Elements (9)ElementTypeGlass
L1Positive MeniscusFD60 / S-TIH6 / N-SF6 class (patent code 805/254)
L2Negative MeniscusNBFD11 / S-LAH51 class (patent code 786/442)
L3Biconvex PositiveTAF1 / S-LAH66 class (773/496)
L4Biconcave NegativeE-FEL1 / S-TIL1 / LLF1 class (548/458)
L5Biconcave NegativeE-FD13 / S-TIH13 class (741/278)
L6Positive MeniscusBACD16 / N-SK16 / S-BSM16 class (620/603)
L7Biconvex PositiveTAC2 / S-LAL61 class (patent code 741/527)
L8Negative MeniscusTAF1 / S-LAH66 class (773/496)
L9Biconvex PositiveE-FEL1 / S-TIL1 / LLF1 class (548/458)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	FD60 / S-TIH6 / N-SF6 class (patent code 805/254)
L2	Negative Meniscus	NBFD11 / S-LAH51 class (patent code 786/442)
L3	Biconvex Positive	TAF1 / S-LAH66 class (773/496)
L4	Biconcave Negative	E-FEL1 / S-TIL1 / LLF1 class (548/458)
L5	Biconcave Negative	E-FD13 / S-TIH13 class (741/278)
L6	Positive Meniscus	BACD16 / N-SK16 / S-BSM16 class (620/603)
L7	Biconvex Positive	TAC2 / S-LAL61 class (patent code 741/527)
L8	Negative Meniscus	TAF1 / S-LAH66 class (773/496)
L9	Biconvex Positive	E-FEL1 / S-TIL1 / LLF1 class (548/458)