While most auto-focus lens designs were new developments, some optical constructions were derived from Minolta SR-mount lenses.
[7][8] The power zoom function was touted to "automatically [provide] a suggested composition" in dealer marketing materials.
[9]: 9–10 Five lenses were released with power zoom features, which are equipped with a single control ring that combines both manual focusing and zoom functions,[10] and are marked as "Zoom xi" lenses:[11]: 108 Later, with the introduction of the Maxxum/Alpha 7 and its support for distance-encoded HS(D) flashes in 2001, Minolta began fitting all lenses with the three additional contacts, repurposed to support the Advance Distance Integration (ADI) functionality, which reports the focus distance back to the camera body.
The initial production runs of Maxxum AF lenses introduced with the camera system in 1985 originally used a "crossed XX" font, which was soon dropped by Minolta after Exxon brought a trademark lawsuit that year; under the settlement, Minolta agreed to change its logo.
A similar scheme previously had been used by Minolta in the 1960s and 1970s to distinguish their Rokkor and Rokkor-X branding variants for SR-mount lenses.