medium-format and view camera manufacturers. Sinar is now a subsidiary of Leica and are continuing developments of high technology digitisation with more spectrally accurate systems and optional image size output from a fixed sized cameraback for increased speed Hardware evolution The early digital camera back market was dominated by scanning, rather than single-shot, models. Since it is much easier to manufacture a high-quality linear (one-dimensional) CCD array that has only a few thousand pixels than a two-dimensional CCD matrix that has millions, very high-resolution scanning CCD camera backs were available much earlier than their CCD matrix counterparts. For example, camera backs with a 7,000-pixel linear resolution—capable of scanning to relatively slowly produce pictures of about 40 MP—were available in the mid-1990s. Many earlier multi-shot backs could natively capture only grayscale images; color images were created by scanning three times through red, green, and blue filters which rotated into place. Early digital camera backs created more data than could be stored on the relatively small storage devices of the time that could be built into them, and had to be connected (tethered) to a computer during capture. Later, one-shot digital backs, which can work at all shutter speeds even on motorized medium-format cameras, were produced. Images are stored on fast high-capacity plug-in memory cards, making tethering to a computer unnecessary so that the backs could be used wherever film can be used. Advantages and disadvantages While dedicated digital cameras suitable for advanced use are available, there are advantages in being able to use a film camera to take digital photographs. A single camera can be used for both film and digital photography. Cameras with features not available on digital cameras (e.g., view cameras) can be used to make digital images. Digital backs which are used in place of the normal film back are available for most medium and all large-format cameras with adaptors which can allow the same digital camera back to be used with several different cameras, allowing a photographer to choose a body/lens combination best suited for each application rather than using a body/lens system which represents a compromise of design to fit a variety of applications. Users with large investments in existing camera equipment can convert it to digital use, both saving money and allowing them to continue to use their preferred and familiar tools. Exposures longer than several minutes are obscured by image noise when captured with