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Thursday, December 4, 2008

The Sensor of the Nikon D90

Capability and size of the sensor grid is everything. And in the heart of the Nikon D90 lies a slightly modified Sony IMX021 CMOS (Complementary Metal-Oxide Semiconductor) sensor grid, churning out 4288x2848 photosites grid image via a 12-bit A/D converter. Now, that's good enough for most users.

12 bits-per-pixel tonal range may not seem like much, but it translates into the ability to render 4096 shades of an individual color - Red, Green & Blue. This alone result in image quality that even our human eyes can no longer differentiate.

If you are familiar with the CCD/CMOS story, one would agree that CMOS generates more noise in its harder-to-design, cheaper-to-make model. Speaking of noise, do take note of the following to minimize noise being introduced in your shoot

  • Avoid long shutter exposure
  • Shots are exposed to low blue or red wavelength of light
  • Very warm environment
  • High ISO set