Entry level dSLR's, for the most part, are using less expensive SD and SDHC memory cards,
So, why do pro-sumer and professional cameras (for the most part) use only Compact Flash (CF) memory? Is it a performance, reliability or durability issue?
Answer
Initially the reason was performance and capacity. A lot of the pro-level cameras went CF because you needed the performance and, usually because a pro shoots RAW, the capacity which the original SD couldn't match. Not to mention there was a point in time where SD was more expensive as a result of volume sales differences. SD is now cheaper thanks in a big way to the proliferation of small devices that used them such as point and shoot cameras, media players, etc.
Anyways, the speed/capacity issues largely evaporated with SDHC and will evaporate with SDXC. Then I think you will see a big move, in fact the shift is already happening without SDXC support in any camera. Canon's 1Ds as noted, but even Pentax stayed SDHC with the 645D medium format and that is miles away from a consumer camera. Also what we are starting to see is dual card support because SD cards are nice and small, that's a nice thing to have and impractical with CF.
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