From: Eric Stevens <eric.stevens@sum.co.nz>
Subject: Re: Cheap SD Cards
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From: Eric Stevens <eric.stevens@sum.co.nz>
Newsgroups: rec.photo.digital
Subject: Re: Cheap SD Cards
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References: <oulin401gbs@news3.newsguy.com> <0001HW.1FBE94060316BB0D70000F3722CF@news.giganews.com> <oun1590236i@news3.newsguy.com> <0001HW.1FBF4C3D0341E77C70000F3722CF@news.giganews.com> <oun6h0026ev@news3.newsguy.com> <0001HW.1FBFB579035A917070000A50D2CF@news.giganews.com> <oupo8c07ga@news3.newsguy.com> <0001HW.1FC0A5C40392E29670000A50D2CF@news.giganews.com> <oups1601ri8@news6.newsguy.com> <0001HW.1FC0AE030394D16D70000A50D2CF@news.giganews.com>
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On Sat, 18 Nov 2017 10:05:55 -0800, Savageduck
<savageduck1@{REMOVESPAM}me.com> wrote:

>On Nov 18, 2017, PeterN wrote
>(in article<oups1601ri8@news6.newsguy.com>):
>
>> On 11/18/2017 12:30 PM, Savageduck wrote:
>> > On Nov 18, 2017, PeterN wrote
>> > (in article<oupo8c07ga@news3.newsguy.com>):
>> >
>> > > On 11/17/2017 7:25 PM, Savageduck wrote:
>> > > > On Nov 17, 2017, PeterN wrote
>> > > > (in article<oun6h0026ev@news3.newsguy.com>):
>> > > >
>> > > > > On 11/17/2017 11:56 AM, Savageduck wrote:
>> > > > > > On Nov 17, 2017, PeterN wrote
>> > > > > > (in article<oun1590236i@news3.newsguy.com>):
>> > > > > >
>> > > > > > > On 11/16/2017 10:50 PM, Savageduck wrote:
>> > > > > > > > On Nov 16, 2017, PeterN wrote
>> > > > > > > > (in article<oulin401gbs@news3.newsguy.com>):
>> > > > > > > >
>> > > > > > > > >
>> > > > > > > > > Sunday I did a quick sunset shoot. Out of 46 images, several had
>> > > > > > > > > weird
>> > > > > > > > > colors in unusual portions of the images.
>> > > > > > > >
>> > > > > > > > That shouldn’t be a problem for you. weird colors in unusual
>> > > > > > > > portions
>> > > > > > > > of
>> > > > > > > > the images should be right in your wheelhouse. ;-)
>> > > > > > >
>> > > > > > > Not like this:
>> > > > > > > <https://www.dropbox.com/s/4n3mlqf07qwmt10/_DSC7524.NEF?dl=0>
>> > > > > >
>> > > > > > Yup! That looks like a corrupt file issue. As to where that corruption
>> > > > > > is
>> > > > > > happening one can best surmise that it was the card. However, there can
>> > > > > > be
>> > > > > > all sorts of causes, mostly due to current, clearing the buffer, and
>> > > > > > writing
>> > > > > > issues. So it would be best to run a check with a known good performing
>> > > > > > card
>> > > > > > to eliminate possible issues with the camera.
>> > > > > >
>> > > > > > What was the brand of the card in question, what was its rating, and
>> > > > > > which
>> > > > > > camera were you using?
>> > > > >
>> > > > > D800, and a Delkin Black. I complained to Delkin. They are sending me a
>> > > > > reader, and requested that I test the card with that reader. The shot
>> > > > > you see is a ten shot multiple exposure. I was testing to see how much
>> > > > > time was needed between shots, to get a similar effect to a long
>> > > > > exposure. despite the corruption, my conclusion is that it can be done.
>> > > > > In a calm bay it takes about 2.5 seconds between each shot, for a ten
>> > > > > shot exposure.
>> > > >
>> > > > What is a Delkin Black?
>> > > >
>> > > > Delkin Black is meaningless, all that tells us is who the manufacturer is.
>> > > > What is the actual read/write speed of the card?
>> > > >
>> > > > Also, because you have somewhat explained what you were doing with
>> > > > multiple exposures, I suspect that this was just a slow card choking on what was
>> > > > being fed it, and unable to clear the camera buffer. I have a feeling that if
>> > > > you just used it to shoot a single exposure there might be no problem at all.
>> > > > If you are going to use a high performance camera, you should use high
>> > > > performance cards regardless of how tempting it might be to go the budget
>> > > > card route.
>> > > Google is your friend:
>> > > <https://www.delkindevices.com/product/black-memory-cards/>
>> >
>> > ...and you have yet to tell us what the actual rating is. Google does not
>> > tell us what is printed on the SD card in your possession.
>> > Which of these Black cards did you buy?
>>
>> UHS-II. As I said earlier, card speed is not an issue with SD on a D800.
>> That is not a combination where R/W speed is important.
>
>UHS-II is just a class of card, still no R/W speed. Typically UHS-II cards 
>are not bargain basement cards, and you describe this particular card as 
>cheap.
>
>Card speed is always an issue D800 or any other camera. R/W speed might not 
>be that important when shooting normal single shots, but you were engaged in 
>shooting multiple exposures.

Does this throw any light on the card requirements?
https://www.dropbox.com/s/6a9lvyuhcy5970r/D800%20Cards.jpg?dl=0
-- 

Regards,

Eric Stevens