SIGMA DP3 MERRILL 50mm f/2.8 — Interactive Lens Diagram

Home / Lenses / Sigma / SIGMA DP3 MERRILL 50mm f/2.8SIGMA DP3 MERRILL 50mm f/2.8JP 2014-126652 A EXAMPLE 3 — SIGMA / OGASAWARA
10 ELEMENTS / 8 GROUPS
f ≈ 48.7 mm
F/2.91 (design)
2ω ≈ 32.1°
1 ASPHERICAL SURFACE
Focus MechanismUnit focus — G1 (L1–L6 with aperture stop) extends toward the object; G2 and sensor are stationary. Only d11 (L6-rear to L7-front gap) changes during focusing.
Optical Elements (10)ElementTypeGlass
L1Positive MeniscusS-LAH55 (Ohara) / TAC8 (Hoya) — Δnd = 0, ΔVd = +0.04
L2Biconvex PositiveS-PHM52 (Ohara) — exact match
L3Biconcave NegativeH-ZF52 (CDGM) — exact match, unconfirmed in Ohara/Hoya/Schott
L4Biconcave NegativeS-NPH2 (Ohara) — exact match
L5Biconvex PositiveS-LAH58 (Ohara) / TAC4 (Hoya) — exact match
L6Biconvex PositiveH-LAF51 (CDGM) or J-LASF019 (Hikari) — unconfirmed
L7Negative MeniscusCF6 (Hoya) — tentative (ΔVd = +0.04)
L8Positive MeniscusSF57 (Schott) / S-TIH53 (Ohara) — exact match
L9Negative MeniscusTAFD37 (Hoya) — tentative; S-LAH65 (Ohara): Δnd = +0.0002
L10Biconvex Positive (1× Asph)Uncertain; TACD5 (Hoya) possible — no confirmed catalog match
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	S-LAH55 (Ohara) / TAC8 (Hoya) — Δnd = 0, ΔVd = +0.04
L2	Biconvex Positive	S-PHM52 (Ohara) — exact match
L3	Biconcave Negative	H-ZF52 (CDGM) — exact match, unconfirmed in Ohara/Hoya/Schott
L4	Biconcave Negative	S-NPH2 (Ohara) — exact match
L5	Biconvex Positive	S-LAH58 (Ohara) / TAC4 (Hoya) — exact match
L6	Biconvex Positive	H-LAF51 (CDGM) or J-LASF019 (Hikari) — unconfirmed
L7	Negative Meniscus	CF6 (Hoya) — tentative (ΔVd = +0.04)
L8	Positive Meniscus	SF57 (Schott) / S-TIH53 (Ohara) — exact match
L9	Negative Meniscus	TAFD37 (Hoya) — tentative; S-LAH65 (Ohara): Δnd = +0.0002
L10	Biconvex Positive (1× Asph)	Uncertain; TACD5 (Hoya) possible — no confirmed catalog match