PENTAX SMC FA* 300mm f/4.5 ED [IF] — Optical Cross-Section & Ray Tracing

Home / Lenses / Pentax / PENTAX SMC FA* 300mm f/4.5 ED [IF]PENTAX SMC FA* 300mm f/4.5 ED [IF]US 4,812,026↗, Example 2 — Mitsunori Iima
9 ELEMENTS / 7 GROUPS
DESIGN f = 300.06 mm
DESIGN F/4.5
ALL SPHERICAL
3 ED ELEMENTS
INNER FOCUS
Focus MechanismInner focus: the cemented L7/L8 pair moves 11.49 mm toward the image while L1–L6, the iris and L9 stay fixed. Infinity and the β = −1/6 close state are printed; positions between follow the paraxial conjugate law.
Optical Elements (9 physical)ElementTypeGlass
L1Positive MeniscusFCD1 (HOYA) / S-FPL51 class ED
L2Positive MeniscusFCD1 (HOYA) / S-FPL51 class ED
L3Biconcave NegativeS-LAH52 (OHARA)
L4Biconvex PositiveFCD1 (HOYA) / S-FPL51 class ED
L5Biconvex PositiveS-TIL25 (OHARA) / E-FL5 class
L6Biconcave NegativeTAF1 (HOYA) / S-LAH66 class
L7Plano-Convex PositiveS-LAH60 (OHARA) / NBFD10 class
L8Biconcave NegativeTAF1 (HOYA) / S-LAH66 class
L9Positive MeniscusLLF4 (SUMITA) class

Element	Type	Glass
L1	Positive Meniscus	FCD1 (HOYA) / S-FPL51 class ED
L2	Positive Meniscus	FCD1 (HOYA) / S-FPL51 class ED
L3	Biconcave Negative	S-LAH52 (OHARA)
L4	Biconvex Positive	FCD1 (HOYA) / S-FPL51 class ED
L5	Biconvex Positive	S-TIL25 (OHARA) / E-FL5 class
L6	Biconcave Negative	TAF1 (HOYA) / S-LAH66 class
L7	Plano-Convex Positive	S-LAH60 (OHARA) / NBFD10 class
L8	Biconcave Negative	TAF1 (HOYA) / S-LAH66 class
L9	Positive Meniscus	LLF4 (SUMITA) class