Images (DICM) Stored on Wrong Partition

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Re: Images (DICM) Stored on Wrong Partition
« Reply #20 on: 15 / September / 2012, 21:39:42 »
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One drawback I see immediately is that the camera cycle time is rather long when writing RAW files. Not exactly ideal for shooting moving creatures while being tugged by a current.
One of the few places where the extra cost of a real Class 10 card pays off.

Quote
Anyway, thanks so much for taking the time to fix this. I enjoyed the process.
Figured I owed it to you - it was my chart that led you amiss in the first place.
Ported :   A1200    SD940   G10    Powershot N    G16

Re: Images (DICM) Stored on Wrong Partition
« Reply #21 on: 15 / September / 2012, 21:47:12 »
The card I have now is a Kingston SD-HC 8GB Class 10. Recycle time is about 8 seconds without flash and ten seconds with.

I also have a Kingston 4GB Class 4 card. Recycle times are nearly identical.

Is there a different brand of card I should look at?

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Offline reyalp

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Re: Images (DICM) Stored on Wrong Partition
« Reply #22 on: 15 / September / 2012, 21:52:05 »
The card I have now is a Kingston SD-HC 8GB Class 10. Recycle time is about 8 seconds without flash and ten seconds with.
8 seconds seems a bit slow. If you are using DNG, check if the "raw buffer cached" option is set in the raw menu, and if not, try setting it.

CHDK raw (not DNG) should be a bit faster, but you may have difficulty finding programs to work with it. Because it's just a dump of the sensor buffer, programs need to support each camera.
Don't forget what the H stands for.

Re: Images (DICM) Stored on Wrong Partition
« Reply #23 on: 15 / September / 2012, 21:54:53 »
The card I have now is a Kingston SD-HC 8GB Class 10. Recycle time is about 8 seconds without flash and ten seconds with. I also have a Kingston 4GB Class 4 card. Recycle times are nearly identical. Is there a different brand of card I should look at?
Doesn't sound right.  If you go to the Miscellaneous Stuff -> Debug Menu there is a Benchmark menu item.  Click that and try the tests with both of your cards ?

There has been discussion about counterfeit card, from even reliable vendors. Labels are cheap to print and swap and how many people are ever likely to notice ?
Ported :   A1200    SD940   G10    Powershot N    G16


Re: Images (DICM) Stored on Wrong Partition
« Reply #24 on: 15 / September / 2012, 22:12:36 »
Turning on "raw buffer cached" made a big difference, bringing the recycle time down to less than five seconds.

I tried chdk RAW. UFRAW flunked, but Raw Photo Processor opened and worked with the .crw file just fine. Not noticeably faster, though.

Benchmark:

Code: [Select]
SD Card Class 10 Class 4
====================================
Raw 7262 3785
Memory 9998 5365
Write 64K 3276 3156
Read 64K 5479 5479

All Kb/s

I find it odd that the cards are almost identical when reading and writing a 64K block to the SD card.

As for counterfeit, who knows. This is Thailand. Rolexes, DVDs, Viagra, you name it, we fake it.

Re: Images (DICM) Stored on Wrong Partition
« Reply #25 on: 16 / September / 2012, 00:34:47 »
I find it odd that the cards are almost identical when reading and writing a 64K block to the SD card.
As for counterfeit, who knows. This is Thailand. Rolexes, DVDs, Viagra, you name it, we fake it.
I get a 1.5x speed up on Write and 2x speed up on Read between a Class 4 PNY card and a class 10 SanDisk Extreme card on my G10.
Ported :   A1200    SD940   G10    Powershot N    G16

Re: Images (DICM) Stored on Wrong Partition
« Reply #26 on: 16 / September / 2012, 02:20:16 »
I really don't think my card is a fake. It was purchased from a nationwide chain called Banana IT. Their parent company also run most of the authorized Apple reseller shops in Thailand.

It's clear that my class 10 card is not performing well. I can get SanDisk here. I will give them a try.

Re: Images (DICM) Stored on Wrong Partition
« Reply #27 on: 16 / September / 2012, 08:54:00 »
It's clear that my class 10 card is not performing well. I can get SanDisk here. I will give them a try.
You numbers are consistent with a Class 4 card on my G10.  I have no idea how much difference there is between cameras using the same card though.  I suppose I could experiment a bit with my three cameras when I have a few spare minutes.
Ported :   A1200    SD940   G10    Powershot N    G16


Re: Images (DICM) Stored on Wrong Partition
« Reply #28 on: 09 / October / 2012, 19:12:27 »
If you think of it when you get back from your dive trip, post a couple of the best photos here ?   Fresh water diving in my part of the world is cold, dark and colourless.

Back from the dive trip.

I'm still working on the photos, but I will post a few later; one now.

I have a question, though. On the first dive I set shutter speed to 1/125 and ISO to 200. Every shot was horribly overexposed because the camera always used an f-stop of 2.7. and an ISO of 320. After I turned off the ISO setting, the images were more properly exposed. I'm not sure what I did wrong there.

The attached photo is of a whale shark. Still not sure I have the colors and white balance right, but I'm working on it.

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Offline fe50

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Re: Images (DICM) Stored on Wrong Partition
« Reply #29 on: 10 / October / 2012, 03:05:04 »
I have a question, though. On the first dive I set shutter speed to 1/125 and ISO to 200. Every shot was horribly overexposed because the camera always used an f-stop of 2.7. and an ISO of 320. After I turned off the ISO setting, the images were more properly exposed. I'm not sure what I did wrong there.
Marketing ISO vs. "real" ISO

ISO values in CHDK are "real" values, Canon use "marketing" ISO values instead which are much higher...

The correlation between real / marketing ISO is not really linear and may differ a bit between different cameras, but you can safely use a factor of 1.6 to convert them...

Sample: CHDK (real) ISO 200 x 1.6 = Canon (Marketing) ISO 320

When you set AV or TV overrides with CHDK, the Canon firmware doesn't know this and may calculate wrong values for other settings...

 

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