"All the current Pentax cameras use the same sensor, which produces an array of 12-bit values. But the file storage on a memory card uses a byte-organised architecture. This means that the 12-bit values from the sensor have to be stored in 8-bit bytes on the card.

"The *ist-D took the simple approach of padding each 12-bit value with 4 extra zero bits, and storing the resulting 16-bit value in two 8-bit bytes."

Was this done in silicon? Is that why there was no firmware upgrade to make the D files the size of the DS files?

Joe

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