The Asahi Pentax ESII is a 35mm SLR introduced in 1973 as an updated version of the original Electro Spotmatic/ES. It uses the M42 screw lens mount and offered aperture-priority automatic exposure with an electronically timed cloth focal-plane shutter, positioning it as a higher-specification model alongside the mechanical Spotmatic line.

At UK auction in 2026, hammer prices for the Pentax ESII sit in a narrow band of roughly £40–£70, with a median around £65 across recent saleroom results. These are wholesale-level results achieved before commission, and what a tidy ESII is worth today depends heavily on whether the electronics still function — bodies sold untested or with shutter faults sit at the bottom of the range, while clean, working examples sell for the upper end.