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Optics: 10 elements in 9 groups. Traditional spherical design, multicoated. Traditional front-group focusing.
Diaphragm: Seven traditional straight blades. Stops down to f/22.
Close Focus: 2.3 feet (0.7m). This is 1 foot (0.3m) closer than the older 35-70mm AI, even before the macro mode. At 70mm a macro mode permits focus as close as 1.15 feet (14" or 0.35m). The older AI version lacks a macro mode.
Infra-Red Focus Indices: Yes, at 35 and 70mm. (The older AI version adds one at 50mm, too.)
Depth-of-Field Scale: None.
Filter Size: 62mm. (The older AI version uses 72mm filters.)