Almost all digital cameras today have live - preview functionality, where a screen is provided in the camera to see the preview of the image that you just clicked. The most commonly compared feature in digital cameras is the “mega pixel. ” This means the amount of pixels in millions. Therefore, a four mega pixel camera would have four million pixels. The other important features to compare include optical and digital zoom capacity; connectivity with other devices such as computer, printer, etc.; the internal storage space as well as compatibility with external storage devices; memory cards; batteries; and image file formats.
Many digital cameras offer connectivity through USB port, FireWire port, USB PTP mode, Bluetooth, Wi - Fi, etc. These days, many cameras are offering PictBridge mode that allows direct printing from the digital camera without the mediation of a computer. Though all cameras have some amount of internal memory, external memory cards are required to save more pictures. These include Micro Drives or Compact Flash memory cards that are generally used for high - end professional cameras. Memory Stick by Sony is a proprietary flash memory card. SD / MMC, Mini SD and Micro SD cards are the ones used mostly for commercial digital cameras.
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