Well unless otherwise specified by the manufacture, if only one speed
quoted it is only guaranteed to be read speed. I don't think that any
of these cards are old enough to have truly execrable write speeds, but
some cards with 90 MB/s read speeds do top out at 30 MB/s or slower
write speeds. IIRC the K-1 bus is capable of ~37 MB/s. I would
probably steer clear of using the SanDisk, just in case, and use the
Lexar Pro 1000x in slot 1 for the DNG files as that's likely to have the
fastest write speed, and the 633x in slot 2. Both of those cards are
likely to have write speeds that out perform the camera's data bus, and
give the best throughput.
On 5/29/2018 1:13 PM, Stanley Halpin wrote:
My questions are partially about relative merit of different cards and partly
about issues, if any, of mixing and matching.
Context:
K-1 with 2 card slots
Shooting with RAW (DNG) images going to the card in Slot 1, jpeg going
to card in Slot 2.
Three different generations of SDXC cards:
SanDisk Extreme 90 MB/s
Lexar Professional 633x 95 MB/s
Lexar Professional 1000x 150 MB/s
In my simple mind, I believe that the three card types, in the order listed,
could be considered Fast, Faster, and Fastest.
Additional context:
- I don’t shoot video
- I seldom shoot a burst; when I do the setting is Single Shot, but
just triggering the shutter several times in sequence e.g. as a duck flies by.
- When traveling,the jpeg files are downloaded to my iPad. That takes
awhile, but even if card speed has anything to do with it, a five minute vs ten
minute time to download would be of no consequence to me.
- When at home, the RAW/DNG files are downloaded onto an internal
drive, copies to an external drive. I suspect that card speed is not a limiting
factor here, and again a few minutes difference is of no consequence.
Question: In theory, would I expect to see any difference in the behavior of
K-1-A loaded with the Fast cards vs. K-1-B loaded with the Fastest cards? E.g.,
if I do shoot a burst, will the buffer clear faster with a faster card?
Question: Is there any reason not to mix-and-match? I pretty much always have
cards with the same speed rating in both card slots, but I don’t know if I am
being a bit too compulsive…
And I would guess that if I did mix them, that it would make sense (?)
for the faster card to be placed in the slot where the larger RAW files are
being written.
Thanks!
stan
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