Our cameras and lenses are tested using the industry-standard Image Engineering IQ-Analyser software. Visit www.image-engineering.de for more details
Like the dp Quattro compacts we've already tested, the sd Quattro's Foveon X3 sensor offers a decidedly Jekyll and Hyde approach to image quality. At low-sensitivity settings of ISO100-400 it's excellent, with astonishing pixel-level detail. But at high ISOs it's awful, lagging far behind conventional Bayer sensors. In what appears to be a tacit admission of this, Sigma Photo Pro 6.4, by default, now drops the output resolution to 4.9MP at ISO 800 (2,712x1,808 pixels), 2.2MP at ISOs1,600 and 3,200 (1,808x1,205 pixels), and just1.2MP at ISO 6,400 (1,356x904 pixels). It's still possible to extract full-size images if you prefer, but they're not great.
Dynamic range
As we’ve seen previously, our Applied Imaging…
