Rob Galbraiths Rubbery figures.

Started Aug 24, 2012 | Discussions thread
Ralf B
Ralf B Veteran Member • Posts: 8,213
An equation with too many unknown variables

I think that no-one can reverse-engineer the design decisions taken by Canon, Nikon and Sony with regards to camera bus speed, buffer size, memory protocol, interface layout etc. etc. just by comparing memory card performance data from different cameras. No-one knows the buffer dimensions for example except the folks that designed and build them.

It looks like the a57 buffer is in relation rather large - that design decision eventually driven by the need to be compliant with slow SD cards while shooting HD video - and that masks a lot of the different compliant card speeds to a degree where a card faster than 45MB/Sec does not give a higher capture frame rate. A fast card still is faster in read-out provided a fast card reader - but that is another topic.

That is what I believe can be concluded from all this.

P.S.: Off topic: Dissing someone else's findings as "rubbery" apparently did not help in keeping the discussion on a factual level.
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Ralf
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