Konica's AR constant-aperture zoom — the 35-70mm f/3.5 Zoom-Hexanon standard zoom.
The Konica Zoom-Hexanon AR 35-70mm f/3.5 was a constant-aperture standard zoom for the Konica AR bayonet on the Autoreflex system. Holding f/3.5 through the range, it was the higher-grade version of Konica's standard zoom, aimed at users who wanted a fixed maximum aperture across the zoom.
This is a manual-focus Konica AR zoom with a 35-70mm focal range and a constant maximum aperture of f/3.5 throughout. The fixed aperture is its defining feature over the variable-aperture version. Element count, filter thread and minimum focus distance are not verified here and are left out rather than guessed.
A constant f/3.5 across the 35-70mm range keeps exposure steady as you zoom, which is convenient for manual metering and consistent depth of field. The wide-to-short-tele span makes it a practical single-lens choice for travel, street and general shooting where changing lenses is a nuisance.
The constant-aperture 35-70mm is a step up from the variable version and priced a little higher. Check the glass for haze, fungus and internal dust, confirm the zoom and focus rings move smoothly without creep, and verify the aperture is dry. It adapts to mirrorless via an AR adapter for manual use.