Question
I own a D5000 and I wonder what memory card to buy for it. I will keep the kit 4GB and downgrade it to "backup" card probably (I will keep it always on me).
Considering a RAW image (I shoot RAW exclusively) is around 10MB and this card cannot shoot faster than 4 frames/second (it's bottlenecked by the internal buffer memory, RIGHT?! Not the memory card?) then it's safe to assume a 40MB/sec card should suffice.
But I'm not sure. Am I correct?
So what speed should suffice for a memory card put in my D5000?
Answer
Burst mode with RAW format will always be bottle-necked by standard SD-cards. I use a class 10 16GB card in my D5000 and I really don't see a noticeable different in the burst speed once the buffer is full compared to the old class 4 card I had. That's why pro cameras still use compact-flash and have larger buffers, it's much faster.
Edit to clarify SD card classes:
The class number is the minimum write speed in megabytes/second when the data on the card is fragmented. So a class 10 card will always be faster in the worst case than a class 4. The class number has nothing to do with the maximum write speed or the latency of the card however. http://en.wikipedia.org/wiki/Secure_Digital#Speed_Class_Rating
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