Stanley Halpin wrote on 5/29/18 10:13 AM:
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.
It is my understanding that at those rates it is not the card speed that
is the limiting factor. If you're driving down a heavily patrolled
freeway and you have your choice of a Corvette, a Ferrari or a McLaren
it doesn't really matter if one tops out at a 178 MPH, another at 167
and the third at 153, with all those cops, it's hard to do much more
than 100 for very long.
In a similar sense, the limiting factor in the camera with those cards
is the bus speed. I don't remember the details, but I don't think the
camera can maintain much better than about 60Mbps. It's further
complicated by some cards (because of buffering?) can store a little bit
of data at a much higher rate than they can store data at a sustained
rate, and it's that burst rate that is usually advertised. There are
other ratings (for video) that list the sustained rate that they can
store data.
In short, if you only shoot a few photos at a time, then the burst rate
is more critical, if you shoot action and take photos fairly
continuously, then the sustained rate is more critical.
In your case, the way to test would be to put the camera in high speed
motor drive mode, hold the shutter down, count how many frames you can
take until the buffer fills, then measure how long until the "write"
light goes out. If there is no substantial difference between each of
the cards, it doesn't matter.
Thanks!
stan
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