System camera camera version body only series sigma sd effective pixels 448 megapixel total resolution 45 megapixel sensor format aps c sensor type foveon x3 quattro sensor size 23 5 x 15 5 mm image processor dual true iii display properties fixed anti reflection coating display type lcd display size 3 inch display pixels 1 620 000 frame coverage display 100 lens mount sigma sa crop factor 15 colour depth 42 bit features external flash opti