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best SD for A99II

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kefkafloyd View Drop Down
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Post Options Post Options   Quote kefkafloyd Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2017 at 14:07
The one real flaw of the a99ii is not having a UHS-II slot. Why Sony cheaped out on that, I have no idea. I would have paid more on sticker price if it meant having a faster slot.

It's still much faster in writing and has a bigger buffer than the original a99, which is good, but you can never be too fast. A UHS-II slot would have cut the write times in half, making the camera last even longer before slowdown.

I don't care much for XQD cards (they're expensive, hard to find, and not widely supported) but maybe in five years they'll be more commonplace.
 



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Jocelynne View Drop Down
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Post Options Post Options   Quote Jocelynne Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2017 at 14:28
Nothing to contribute at this time. Just a note of appreciation from a new A99MkII, owner with extensive A99MkI experience, for the comments in this thread.

Respectfully,
JL
Maxxum 450si, Sony A300, A700, A900 and a cubic meter of Alpha lenses
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2017 at 14:41
Originally posted by kefkafloyd kefkafloyd wrote:

A UHS-II slot would have cut the write times in half, making the camera last even longer before slowdown.

That is not necessarily true. Most cameras that have UHS II slots the camera still doesn't write to them at full UHS I speed with fast UHS II cards. I suspect it takes a lot of power to operate the bus at the highest clockspeed.

Take a look at performance tests on the new GH5 with dual UHS II slots. This is the camera everyone is comparing the A9 to because the A9 only has one UHS II slot. The GH5 can only sustain 92 MB/s with the fastest UHS II cards. That is within the capabilities of UHS I. The fastest UHS I card in that camera is only 40 MB/s. Who wants that? Well maybe the slow UHS II slots consume less power than a fast UHS I slot--and if they consume less power they produce less heat.

The more inexpensive Canon 77D that doesn't support UHS II can write fast UHS I cards at 80.4 MB/s.

The Nikon D500 which supports UHS II and XQD can write the former at 163.4 MB/s and UHS I at 84.3 MB/s. It is a pretty large camera with a beefy battery, so it probably can handle the power draw much better. It is a bit strange they haven't tested the new Sony 299 MB/s UHS II cards in the D500.

Edited by QuietOC - 09 June 2017 at 14:46
A65 30M 35 50 16-50 16-80 16-105 18-135 18-250 55-200 55-300
A5000 LA-EA1 16 20 16-50 18-55 55-210
Maxxum 70: 20 24 28 50 85 100M 135 28-105 28-135 35-70 35-105 35-200 70-210 75-300 100-300D
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kefkafloyd View Drop Down
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Post Options Post Options   Quote kefkafloyd Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2017 at 14:52
My statement was based on the a9, where it appears that the UHS-II slot cuts the buffer clear time considerably. UHS-1 cards take about 120 seconds to clear a full burst of the 20FPS 24 MP RAW, while the UHS-2 cards take 36 seconds to clear. I would have expected the a99ii to not perform as well, hence a conservative "half the time" versus "one fourth the time."

The D500's battery is comparable to the a99ii's (1900mAh vs 1600 mAh, 7VDC vs 7.2VDC). The a9's new battery is 2280 (also at 7.2VDC).

The points about current draw / longevity are valid, though I would prefer to make that call myself based on what cards I'm using versus having it decided for me.

All that said, I still like the a99ii's performance... I just always want more!

Edited by kefkafloyd - 09 June 2017 at 14:56
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alex-b View Drop Down
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Post Options Post Options   Quote alex-b Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2017 at 13:36
this seems fast as sandisk extreme proKINGSTON 128gb

butit seems too with nikon cameras have problems about loose data or corrupt files
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Eclipse View Drop Down
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Post Options Post Options   Quote Eclipse Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2017 at 09:33
Slightly veering towards O/T, but has anyone any recommendations for a decently fast USB III card reader? I got a Lexar one a while ago, and frankly is it hardly any faster than my old USB II one, that's on my work desktop so no issue with the computer. It's not the cards that are limiting it AFAIK either. It can easily take a quarter of an hour or more to download a 32GB card.
 



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Eclipse View Drop Down
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Post Options Post Options   Quote Eclipse Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2017 at 09:46
Originally posted by QuietOC QuietOC wrote:

Originally posted by waldo_posth waldo_posth wrote:


- if you are using the camera frequently for continuous shooting and high resolution (4K, Super35) video get a fast card (150 MB/s).

The Sandisk Ultra is rated 80 MB/s, the Extreme Pro is rated 95 MB/s. You pay about twice the price for a 150 MB/s card like the Lexar Professional 1000x.

The fastest bus speed specification of UHS I is 104 MB/s. The A99II doesn't have the second contacts to support UHS II. It looks like ~95 MB/s is about the most you can expect from the UHS I bus.

Most reports are the A99II can only write about 60 MB/s, so even the 95 MB/s cards might be overkill. Here is someone who has tested a few cards in the A99II. 60 MB/s is much better than previous Sony UHS cameras which have been only able to do a bit over 35 MB/s writes.


Thanks for that link, very interesting. I was, however, perplexed by the difference between the 2 Sandisk Extreme Pro UHSIIs- one rated at 300, the other at 280, but with the latter having about half the speed of the former in the camera - 35 as opposed to 60. The UHS1 sandisk Pro mentioned was also 60.....
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lhkjacky View Drop Down
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Post Options Post Options   Quote lhkjacky Quote  Post ReplyReply Direct Link To This Post Posted: 30 June 2017 at 17:52
Originally posted by waldo_posth waldo_posth wrote:

- if you are using the camera frequently for continuous shooting and high resolution (4K, Super35) video get a fast card (150 MB/s).

The Sandisk Ultra is rated 80 MB/s, the Extreme Pro is rated 95 MB/s. You pay about twice the price for a 150 MB/s card like the Lexar Professional 1000x.


No offense, but you are completely wrong.

1, The Sony 4K Super 35 only record in 100mbps. (1 Byte = 8 bit)
100mbps = 12.5 MB/s only.
Sony recommend using a U3 rating card, because Class 10 only guarantee 10MB/s, which is too slow for 100mbps (12 MB/s).
U3 guarantee 30MB/s, therefore it is safe for 4K, super35 100mbps (12.5 MB/s).
You don't need 150MB/s card for 4K. Any U3 rating card that guarantee min 30MB/s is already more than enough.

2, Sony A99/ A99II both don't support UHS-II, they don't have the extra pins in the card slot. It is meaningless to use UHS-II. The UHS-II card will drop back to UHS-I mode. You pay more money but gain nothing at all.

3, The Lexar 1000x card is totally crap.
The 150MB/s are read speed only. Most online store hide the write speed of that card, because that Lexar 1000x UHS-II card only have max. 75MB/s ~ 80MB/s in write speed.
It is slower than a Sandisk Extreme PRO 95MB/s UHS-I card with 90MB/s Write speed.





Edited by lhkjacky - 30 June 2017 at 17:55
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