When I put a formatted CompactFlash card in my E-450, the display shows a capacity of RAW files that doesn appear to be accurate. Why?
The manual for the E-450 shows that a RAW file is approximately 11 megabytes. However, this is just an average; the size of individual RAW files will vary widely. When the E-450 saves a captured image and writes it onto the memory card, it performs complex mathematical calculations to convert the image to binary data that can be saved and later retrieved. One of the ways it does this is by sampling some of the factors in the image. Because images are unique, each calculation is unique and the product of the calculation will vary. For example, a winter landscape consisting of predominantly white snow and blue sky will produce a smaller data file than a scene such as Times Square at night. The richness of the latter scene will result in a larger file. When the E-450 polls a formatted memory card, it is looking at a blank slate. It has yet to do the math for any images and is programmed to start out with a conservative capacity estimate. As the camera shoots more images, it recalculates t
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