Sigma SD15

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Sigma SD15[1]
Sigma SD15.jpg
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[edit]

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.


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  1. ^ "Sigma SD15". Imaging Resource. Retrieved 2010-10-16. 
  2. ^ "Sigma re-introduces SD15 digital SLR". DPreview. Retrieved 2010-10-17. 
  3. ^ Foveon X3 sensor
  4. ^ "Sigma SD15 - TRUE II". Sigma Corporation. Retrieved 2010-10-17.