The normal digital cameras are specifically designed to use any one type of memory card for storing the images, while most of the professional cameras use compact flash (CF) memory cards for storing images. When compared to normal memory card types, the CF cards have very good read and write speeds which is around 40 MB/sec, and this is a huge difference in speed among other memory card types.
There are two main subdivisions of compact flash cards, one the Type I (3.3 mm thick) card and other, the thicker Type II (5 mm thick) cards. The CF memory cards come in sizes of 2GB, 4GB and 8GB, and are specifically designed for use by professional photographers who use their digital cameras to shoot RAW and JPEG images which are usually very large in size and can quickly fill up the memory card.
The compact flash memory cards are aimed at photographers who needs better performance card that supports rapid-fire shooting and full motion video, without any break in quality. With the introduction of CF memory cards, the writing speed of captured images or videos on to memory card has increased drastically, and also the CF cards allow in writing images quickly without any interruption.
Compact flash memory cards have become popular storage medium for digital cameras, and in recent years it has been widely replaced by smaller cards on the consumer end, but because of its superior capacity and reliability, still it is the preferred format for many of the D-SLR cameras.
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