The only website that I've found that even makes a pretense of measuring
the bus speed of cameras has the K-3 II at 37.2mb/s, using cards that
tested with often much higher write speeds, so you don't really need to
worry if that 90Mb/s is read or write speed, only if the write speed
exceeds the bus speed of your camera, which in the case of the K-3II is
a bit over 37Mb/s. So a card with a real write speed of 40Mb/s would
probably do.
The site that tested the K-3II is here with a comparison of a variety of
cards.
https://www.cameramemoryspeed.com/pentax-k-3-ii/fastest-sd-card-comparison-test/
This group of tests was obviously done some time ago as a number of the
cards mentioned are no longer available in all storage sizes.
I haven't been able to find tests on a lot of less expensive cards, and
haven't really been looking since I can't seem to find a reasonably
priced and warrantied K-3 since last December, when I was quite low on
pennies, but it looked at the time that most, but not all, major brand
cards that were rated at 80-90Mb/s were at least capable of 30Mb/s which
would have very little effect on performance in the K-3II, since it
depends on depth of buffer a lot more than bus speed for it's performance.
I'm still using a K-5II and I've only once, that I remember, run out of
buffer with that camera. I've been primarily using PNY cards. They
were cheap and available a number of places a while ago, and the
specifications were good for the price. I could probably replace them
with cards that were twice as fast in actual use for half the price/MB,
but the camera bus speed is more of an issue than the actual throughput
of the card.
On 5/24/2019 6:46 PM, Larry Colen wrote:
It's been a while since I've purchased SD cards.
What is the current price/performance/quality sweet spot these days?
Ideally in make, model and size. And if someone bought cards in the
near past, a pointer to the item in the store would be fantastic.
I'm going to need to get a couple cards soon, and I'm hoping someone
else recently did the research, because the sweet spot tends to change
every month or two.
The last I checked you got the most storage for your money at about 64GB.
Some people are Sandisk, or nothing, others are happy with PNY,
Patriot etc. There are also other "name brands" that one could look at.
Also, the various speed ratings on SD cards are difficult to sort out,
at best. 90Mb/S isn't always 90 Megabits, there's also class 10 etc.
With the sucky bus in the K-1, there's probably a certain point where
faster doesn't improve the camera's performance, but I can always hope
that new models will be better.
--
America wasn't founded so that we could all be better.
America was founded so we could all be anything we damn well please.
- P.J. O'Rourke
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