Subject: Re: Cheap SD Cards
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From: PeterN <"peter,newdelete"@deleteverizon.net>
Newsgroups: rec.photo.digital
Subject: Re: Cheap SD Cards
Date: Sat, 18 Nov 2017 12:46:54 -0500
Organization: NewsGuy - Unlimited Usenet $23.95
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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.


-- 
PeterN