I care because I do stacked macros in the field, which involves taking
several images while shifting the focal point. I usually don't exceed
the buffer limit for one sequence, but a fast card helps in two ways.
First, I usually wait for the buffer write to the card before starting a
new sequence. With a slow card that can feel like an eternity,
especially if the subject is transient (bug likely to fly away) and I
want a second run at it. Second - in those cases where I do exceed the
buffer limit a fast card is still workable, while a slow card is not.
It's less of an issue with stationary subjects but still results in
spending a lot of time waiting for the red card access light to go off.
Slow cards are no problem in most situations were getting a lot of shots
in sequence is not a priority. I pulled my slowest cards out of my bag
and use them for studio stacked macros since that is a slow process
process and the slowest card can keep up. But if you are shooting a lot
of images in a fast pace, card speed matters.
Actually - write speed matters. AFAIK, the only drawback to read speed
is slower downloads to your PC, and that I can live with.
On 2/21/2016 8:26 PM, Stanley Halpin wrote:
From the helpful link Cotty provided and discussion here and other reading, I
have concluded:
a. Higher numbers are “better” for values of better ranging from -50mbs
to +50mbs, more or less.
b. The main concern is with read or write speed when streaming video.
c. I don’t know why I should care.
Really, I don’t know why I should care. I have reluctantly assumed that all
this kerfluffel about video speed in fact relates in a somewhat linear fashion
to what I do care about which is how fast still images move from the internal
camera buffer to the SD card in the slot. But I have also assumed that the
buffer-to-card process has a lot to do with the camera’s firmware and maybe not
so much to do with any limitations of the card. Is there anything anyplace that
tells us what the minimum necessary “speed rating” for SD is for a given
camera? Specifically, newer large-datafile cameras like the K-5, K-5ii, K-3,
K-3ii, K-1, 645D, 645Z shooting still images and not movies…
On Feb 21, 2016, at 7:45 PM, Mark C <[email protected]> wrote:
I didn't know about the extreme plus. Here are the links to 32 gb Extreme, Pro and
Plus cards on B&H. It looks like the Plus is discontinued.
Extreme Pro -
http://www.bhphotovideo.com/c/product/824140-REG/SanDisk_SDSDXPA_032G_A75_Extreme_Pro_32_GB.html
Extreme -
http://www.bhphotovideo.com/c/product/1182602-REG/sandisk_sdsdxne_032g_gnci2_extreme_32gb_sdhc_u3.html
Extreme Plus -
http://www.bhphotovideo.com/c/product/992490-REG/sandisk_sdsdxs_032g_a46_32gb_sdhc_extreme_class.html
I just noticed that the extreme and the extreme plus are water / shock / xray
proof. So that's something. Maybe.
On 2/21/2016 7:09 PM, Larry Colen wrote:
Mark C wrote:
My own two cents is that you really have to research the detailed specs
on the card you want to buy, paying attention to the actual write speed.
The ratings and classes are so broad that cards with seemingly identical
ratings can have significantly different performance.
I recently added a couple of 32 gig memory cards. I compared San Disk
Extreme Pro and San Disk Extreme. Both are USH-1. Both are marked "HC-1
U3 C10." The Pro is marked "95 MB/S" and the Extreme is marked as "90
MB/S." It seemed like their specs were very close - but then looking at
max write speed I saw that the Pro is rated for 90 MB/S while the
Extreme is rated for only 40. The rate stamped on the cards themselves
is the read speed.
So - the Extreme Pro is actually 2x as fast for what matters (write
speed). But the ratings looked to be practically identical.
I am having a hard time telling the difference between the extreme plus and the
extreme pro. Their naming system is complete bafflement, which is probably
their goal.
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