LEICA ELMARIT-R 28mm f/2.8

US 3,591,257 Example 3 — Mandler / Edwards / Wagner

8 ELEMENTS / 6 GROUPS
f = 28 mm (e-line trace ≈ 29.2 mm)
F/2.8
2ω ≈ 74°
ALL SPHERICAL

Focus Mechanism

Unit focusing — entire optical assembly translates along the optical axis.

Optical Elements (8)

ElementTypeGlass
L1Negative MeniscusSK16 (SCHOTT)
L2Negative MeniscusSK16 (SCHOTT)
L3Biconvex PositiveLaF21 (SCHOTT)
L4Negative MeniscusSF6 (SCHOTT)
L5Negative MeniscusSK16 (SCHOTT)
L6Plano-Convex PositiveLaF10 (SCHOTT)
L7Negative MeniscusSF6 (SCHOTT)
L8Negative MeniscusF2 (SCHOTT)

Analysis

Detailed analysis available in the interactive viewer above.