Sigma SD15

{{Short description|Digital camera model}}

{{Infobox camera |

model = Sigma SD15{{cite web| url=http://www.imaging-resource.com/PRODS/SD15/SD15DAT.HTM| title=Sigma SD15 | publisher=Imaging Resource| accessdate=2010-10-16}} |

image = Sigma SD15.jpg |

kind = Digital single-lens reflex |

sensor = 20.7 mm × 13.8 mm Foveon X3 sensor |

res = 2652 × 1768 × 3 (14.1 million effective pixels, 4.69 megapixel output image size) |

lens = Interchangeable (Sigma SA mount) |

viewfinder = Optical, pentaprism |

storage = SD card |

shutter = electronic focal-plane |

shutterRange = 30 s to 1/4000 s, 2 min to 1/4000 s in extended mode |

metering = TTL, full aperture, zones |

emode = Programmed, shutter-priority, aperture priority, manual |

mmode = 77 segment evaluative, Center Area, C/Wgt Average |

farea = 5 points, cross pattern |

fmode = One-shot, Continuous, Manual |

cont = up to 3.0 frame/s |

speedRange = 100–1600 in 1 EV steps, 50 and 3200 in extended mode|

rearLCD = 3-inch (76.2 mm), 460,000 pixels |

WB = 6 presets, auto, and custom |

flash = pop-up, sync at 1/180 second |

weight = 680 g (body only) |

battery = 1500 mAhr 7.2 V Li-ion rechargeable|

}}

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 in June 2010.{{cite web| url=http://www.dpreview.com/news/1002/10022009sigmasd15.asp| title=Sigma re-introduces SD15 digital SLR | publisher=DPreview | accessdate=2010-10-17}} It is Sigma's fourth DSLR since the SD9 from 2002.

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.Foveon X3 sensor