Three hundred percent: that’s the difference between Sigma’s latest flagship medium-format camera, the SD1, and its predecessor, the SD15. With 46-megapixel resolution (three layers of 15.3-megapixel Foveon X3 sensor cards), Sigma is blazing trails with this particular model.

Scheduled to be released in June, the SD1 is housed in a weather- and shock-resistant...

Sigma Corp. has introduced a successor to the SD14. The SD15 camera incorporates a 14-megapixel Foveon X3 sensor and a 3-inch, 460k-dot LCD screen.

With the X3 sensor, the SD15 can capture all primary RGB colors at every pixel location. Using three levels of photo detectors, the SD15 is able to more accurately reproduce color and offer a sharper image resolution. Up to 21 frames can be...