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 Post subject: Is my K20d defective?
PostPosted: Mon Nov 17, 2008 10:24 pm 
hi, i want to ask all of k20d owners..

in continous shooting my k20d does: 12 jpegs then stops or 8 raws then stops.
is there something i do not know?
i performed the tests in Tv mode set shutter speed at 1/80 f/2.8..

any comments?


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 Post subject:
PostPosted: Tue Nov 18, 2008 4:43 pm 
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Joined: Sun May 27, 2007 12:39 pm
Posts: 601
Location: France
Bonsoir Mystic,

Just a couple of questions about the problem you're experiencing...
  • When you say the K20D stops, does it really stop and shut down or does it pause for a while and then resume shooting?
  • Which SD card are you using?

I experienced the same with my K10D with a pause every 6 shots, as for the :arrow: the ducks swimming.

I changed my SD card for a faster one and get rid of the problem. See the result with :arrow: the wave sequence :!:

I hope this solution will suit you :)

_________________
--- rei_vilo
Pentax K-5 + BG4 + DA* 16-50 + DA* 50-135 + DA* 60-250 + AF-540FGZ
reivilophotography.weebly.com


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 Post subject: hmmm..
PostPosted: Tue Nov 18, 2008 7:08 pm 
well it's not that bad, that it would shut down.. it simply make a pause and then continues to shoot much slower..
but then it becomes not a not useful fps.. 1.5 - 2 fps..

SD card that i use is an SDHC 4gb..
but I will experiment with others..
thanks Rei_vilo for your suggestion..

i also realized, that when i change Jpeg compression from 5 stars to 3, 2, 1..
the number of shots increases.. when using 1 star 14mgpx files continuous shooting lasts for 19 shots..

hmmm..


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 Post subject:
PostPosted: Thu Nov 20, 2008 12:33 am 
It's the 'buffer': the memory images are stored after they are captured but before they are written on the memory card. As the buffer size is physically constant* it's normal for large RAW files or fine JPEGs to fill it up, at which point your continuous shooting speed will choke down. As you saw for yourself, increasing JPEG compression yields smaller files, which can flush through the buffer much easily and thus, the speed doesn't suffer much. A faster memory card helps: think of this as a hole at the bottom of the pool: the larger the hole, the faster the water drains down.

*Nikon managed to 'expand' the buffer on the D3 via a firmware upgrade. I simply don't know how they pulled it off without adding additional physical memory, but I think it might be some sort of read/write optimization.


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 Post subject:
PostPosted: Thu Nov 20, 2008 8:22 am 
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Joined: Sun May 27, 2007 12:39 pm
Posts: 601
Location: France
Bonjour,

Hailstorm wrote:
It's the 'buffer': [/i]

Yes, it could be. But changing the SD card is worth a try.

In my case, the K10D buffer remained unchanged, but the new SDHC-card SanDisk Ultra II solved the problem.

Image
Old and new SD cards

Mystic, keep us informed :!:

_________________
--- rei_vilo
Pentax K-5 + BG4 + DA* 16-50 + DA* 50-135 + DA* 60-250 + AF-540FGZ
reivilophotography.weebly.com


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 Post subject:
PostPosted: Thu Nov 20, 2008 1:20 pm 
thanks Rei_vilo,
in the mean time i'll buy some new sd card..
then i'll let you know..


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