FWIW, I recently purchased another SanDisk Extreme 32GB to augment an
exsting card I purchased with my K3. Both are marked HC1. the older card is
rated 45 MB/s, speed class 1 with the newer card marked 90 MB/s, speed class
3.
Haven't done any objective tests but I haven't noticed a any significant
difference in write speedhooting just stills.
BTW - I've used only SanDisk since my *istD and have never been let down.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "Mark C" <[email protected]>
Subject: Re: Can someone explain to me SD card speed ratings?
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 looked very carefully at the cards after getting burned buying a couple
16 gig Sony cards, also rated HC-1 U3 C10 and listed as 40 MB/S. Reality
is a fairly slow 10 MB/S write speed. Not good when shooting in HS burst
mode on the K3.
Mark
On 2/19/2016 4:17 PM, Larry Colen wrote:
I can see that when I get a K-1 I'm going to need some more memory cards.
I'll want two to keep in the camera, and (at least) a couple of spares so
that I don't have to erase the cards until I'm done processing, certain
of my backups etc.
I went to look at them online and they are variously rated with
Class 10, UHS-1, U1, U3. 80Mb/S max write speed, 10 Mb/S min write speed
and so forth.
Is there a clear concise description of what to look for in an SD card
for photographic applications?
Related question: specific recommendations for ones to look for, ones to
avoid, and particularly good deals.
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