Sigma's ultra-wide Foveon compact — the dp0 Quattro, fixed wide prime, X3 Quattro sensor, APS-C, 2015.
The Sigma dp0 Quattro is a fixed-lens digital compact announced in 2015, part of Sigma's dp Quattro series and built around the Foveon X3 Quattro sensor. The Quattro compacts used a distinctive elongated body shape, and the dp0 carried the widest lens in the line, aimed at wide-angle landscape and architectural work.
It is a fixed-lens compact with no interchangeable mount and no reflex mirror, so it has no lens mount and takes no removable lenses. Its APS-C-class Foveon X3 Quattro sensor uses three stacked layers with a revised split of resolution between them, capturing colour at each location rather than interpolating it, matched to a fixed ultra-wide prime. The body has no in-body stabilisation and no meaningful video, composes on the rear screen, records raw for Sigma Photo Pro, and takes SD-type media.
The dp0 Quattro is valued for the distinct Foveon output combined with a very wide angle of view, suited to landscape, architecture and travel photography at low ISO. Its elongated grip-forward body handles differently from a conventional compact, and like other Foveon models it is deliberate to shoot with limited high-ISO latitude, rewarding a considered approach.
When buying used, expect slow operation and rapid battery drain typical of Foveon compacts, so test power and carry several spare batteries. Check the fixed lens and sensor area for dust or marks, inspect the rear screen for dead or stuck pixels, and confirm the card and battery doors latch. Raw processing depends on Sigma Photo Pro, and service support is limited, so buy a tested example and plan the workflow around it.