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07-25-2011, 11:41 AM   #1
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Available shots on card don't add up.

OK, I think I found a bug in my K-r. It's not critical, but it requires me to mentally convert the number of pics left to shoot whenever I look at the display.

I have an 8GB Class 10 Black's card, which seems to be rebranded Sandisk. Works great. It's really good for dumping bursts to the card quickly, and I haven't had a damaged file show up yet. When I put it in the camera, empty, and it says I can take 402 raw (dng) shots.

Yesterday I took 434 shots and it only used 4.3 GB, and the camera said I could take another 183 shots.

It's basically reporting half the number of available shots. No clue why.

07-25-2011, 12:01 PM   #2
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From what I understand DNG files take advantage of JPEG lossless compression. I'm not sure of the details but I also shoot DNG. You'll note that the DNG file sizes can vary quite a bit. Therefore, since the camera cannot anticipate what you will be shooting it probably bases the estimates on the maximum file sizes with minimum compression.

I just looked at shots I took yesterday, the smallest file was 9900 KB while the largest was 15700 KB.
07-25-2011, 12:06 PM   #3
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Ah, that might be it. The vast majority of mine end up at 9-10 MB, but if it's allowing 20 MB as the conceivable maximum per shot, that would add up. Thanks.
07-25-2011, 12:13 PM   #4
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The newer cameras do compression on everything - lossless on RAW, but still compression. The shots available assumes your files are a typical size but they vary. If your files compress a lot, you get a lot more on a card than indicated.

Images that don't have too much detail or color compress better. I was taking a lot of photos to catch lightning recently and had the same experience. Some of those files are a third the size of average images.

07-25-2011, 12:29 PM   #5
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I love the quality of answers on this forum.

Thanks both, I'll just take the number as a (very) rough indication from now on. I wish there were a way to have it display remaining megabytes instead of shots.

And yeah, I shoot many many shots with large areas of bokeh in them, often >75% of the image will be a fairly smooth gradient, so that would explain why so many of mine are towards the lower end of the expected range.
07-26-2011, 12:54 AM   #6
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At least it's underestimating it's capacity. Better than thinking 'oh I've got loads of space left' only to fill up the card in ten minutes
07-26-2011, 10:20 AM   #7
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It looks like K-r is underestimating the capacity in .jpeg mode by about 50%. At least for me A 4GB SD according to the camera can store 550 pics but will hold anything between 750 and 800 pics @ 5000 kB per photo (on average with 12MP size + best quality).
07-26-2011, 10:33 AM   #8
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QuoteOriginally posted by icejam Quote
It looks like K-r is underestimating the capacity in .jpeg mode by about 50%. At least for me A 4GB SD according to the camera can store 550 pics but will hold anything between 750 and 800 pics @ 5000 kB per photo (on average with 12MP size + best quality).
That's because the final file size is dependent on the subject matter. A picture that contains a lot of empty sky can be compressed far more than the same scene could be if the sky were filled with multi-colored, highly detailed hot air balloons. The camera has no way of predicting what you will take a picture of next, so it predicts remaining photos based on minimal compression.

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