Gracias, amigo.
Much help. The SD card is key. It's the first card the camera writes to.
Sometimes I spill over, but not often.
--Bob
On Mar 31, 2013, at 5:02 PM, Moose wrote:
> On 3/31/2013 6:48 AM, Bob Whitmire wrote:
>> I'm in the market for some fast SD cards, as the D800 files are somewhat
>> hefty and the standard issue SD or CF takes a bit of time to write.
>
> It can be a bit confusing. (I'm only up to date on SD, so you are on your own
> for CF.)
>
> First, we had all the 'X' speed designations, which obviously were not
> standardized, and in some cases seemed to have
> been designated by marketing.
>
> Then we had 'class x' ratings, which are much more meaningful, but have
> peaked at Class 10.
>
> UHS* is actually a different interface protocol**, and requires that the
> camera understand it. Your D800 can do UHS-1.
> UHS-2 exists as a spec. Wikipedia says no cards exist as yet and I doubt any
> cameras yet support it.
>
> (There's an in between mode, called UHS104, which supports twice the clock
> freq. and transfer speed. Sandisk, at least,
> has cards with rated write speed of 90MB/s which means they must have this.
> But what devices may be able to use it, I
> have no idea. Sounds like something to gull us into paying for capability our
> cameras can't use.)
>
> But for you, and me, it's UHS-1.
>
> I came to try them when B&H had a closeout sale of Sonys, two 32 GB cards for
> $35. They claim a write speed of 45Mbps,
> 4.5 times the Class 10 spec and near the theoretical 50 max. of the spec.
>
> NOTE: The speeds on the card labels are meaningless for camera use. They are
> read speeds***, not write speeds. A card
> like the Sandisk Extreme 8GB card sitting in front of me is a Class 10 that
> says "30MB/s" on the front. But that's the
> read speed; write is 10MB/s.
>
> The Sonys I just got do the same thing, touting 94MB/s on the label. Both
> brands have an asterisk on the MB/s label
> number, but no footnote on the card.
>
> Ultra Something Moose
>
> * Ultra High Speed, duh.
>
> ** Sounds to me like some sort of return from serial to parallel, with a
> "four-bit transfer mode" per clock cycle.
>
> *** And indeed, even though not UHS-1, the reader I installed in my computer
> does seem faster with the cards with faster
> read ratings.
--
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