Overview

The Konica Hexanon AR 21mm f/4 is an ultra-wide rectilinear lens known for very good sharpness and high contrast. It exhibits visible but not disturbing vignetting and well-corrected distortions, though pincushion distortion may appear with straight lines. Build quality is extraordinary across all versions, with a large front element prone to flare; the original rectangular hood is recommended. The viewfinder is dim at f/4, making focusing tricky in low light. It suits photographers seeking an extreme wide-angle for panoramas, who can manage flare and dim focusing.