Sigma SD15

Sigma SD15^[1]

Type	Digital single-lens reflex
Sensor	20.7 mm × 13.8 mm Foveon X3 sensor
Maximum resolution	2652 × 1768 × 3 (14.1 million active photoelements)
Lens	Interchangeable (Sigma SA mount)
Flash	pop-up, sync at 1/180 second
Shutter	electronic focal-plane
Shutter speed range	30 s to 1/4000 s, 2 min to 1/4000 s in extended mode
Exposure metering	TTL, full aperture, zones
Exposure modes	Programmed, shutter-priority, aperture priority, manual
Metering modes	77 segment evaluative, Center Area, C/Wgt Average
Focus areas	5 points, cross pattern
Focus modes	One-shot, Continuous, Manual
Continuous shooting	up to 3.0 frame/s
Viewfinder	Optical, pentaprism
ASA/ISO range	100–1600 in 1 EV steps, 50 and 3200 in extended mode
Custom WB	6 presets, auto, and custom
Rear LCD monitor	3-inch (76.2 mm), 460,000 pixels
Storage	SD Card
Battery	1500 mAhr 7.2 V Li-ion rechargeable
Weight	680 g (body only)

The Sigma SD15 is an updated version of Sigma SD14 DSLR produced by the Sigma Corporation of Japan and featuring the improved TRUE II image processing engine, but with the same image sensor as its predecessor. As such, the SD15 features the 4.7 MP Foveon X3 sensor. After having showcased the camera in Photokina 2008 and officially introduced during PMA 2010, it finally began shipping on June 2010.^[2] It is Sigma's fourth DSLR since the SD9 from 2002. As of November 2011, they are being sold off in Germany complete with lens for €379.

There is some dispute over the 15.0 MP claim made by Sigma, resulting from the major differences between the industry standard Bayer sensor used in all other digital cameras, and the Foveon X3 full-color image sensor used almost exclusively in Sigma cameras. Since the Foveon sensor captures images via a three-layer red, green, blue silicone array similar to the three-layer technology used in Technicolor film, rather than the single-layer color interpolation method used by Bayer sensors, Sigma and Foveon count each RGB layer separately, so 4.7 MP times 3 translates to their 15.0 MP claims. ^[3]

Differences with the SD14

While the SD15 retains the image sensor from its predecessor, it includes the improved TRUE II image processing engine that was already implemented in the Sigma DP2. Sigma claims that the new engine offers better quality with a faster processing speed while suppressing noise through a newly developed proprietary algorithm.^[4] The combination also offers a one-stop higher ISO range compared to the SD14, though the often desaturated rendition of natural green and oversaturation of blue has been retained.

The SD15 also features a larger, higher resolution LCD screen. The SD15 also introduced Color Modes. The storage medium was changed from a CF card to an SD card.

References

Wikimedia Commons has media related to: Sigma SD15 or Taken with Sigma SD15