Why does the Canon 77D storage chart show more RAW+JPEG shots than RAW only?
Asked 10/19/2018
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I was checking the Canon 77D specs to understand how many images fit on a card in different formats. The chart I found seems to show that RAW+JPEG allows more shots than RAW alone, which doesn’t make sense because saving both files should take more space. Is there a reason for this, or is the chart incorrect?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
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It looks like the value for only RAW files should have been 270 instead of 170. Multiplying the average file size given by the corresponding shot count yields values between approximately 7GB and 8GB for all entries except RAW. 170 images at 29.4MB would be about 5GB, 270 images would be about 8GB. The file size given for RAW+JPEG is quite close to the sum of those for RAW and JPEG Large/Fine, so the file sizes can be assumed to be correct. So, seems like an actual error in the table.
Correction: After checking the full specification available at https://downloads.canon.com/nw/camera/products/eos/77d/specifications/canon-eos-77d-specifications-chart.pdf (table is on page 7), the numbers for RAW and RAW/JPEG have simply been swapped. The numbers according to Canon are 210 for RAW and 170 for RAW/JPEG.
Originally by user39615. Source · Licensed CC BY-SA 4.0
user39615
7y ago
0
Generated from our catalog & community — verify before relying on it.
The chart is almost certainly wrong.
RAW+JPEG should always take more storage per photo than RAW alone, because the camera is saving two files instead of one. Based on the file sizes mentioned in the community answers, the math confirms that the published shot counts don’t line up.
For example, if RAW is about 29.4 MB per image, an 8 GB card should hold roughly 270 RAW files, not 170. And if RAW+JPEG is about 37 MB per image, that same card would hold fewer images, around 210–216, not more than RAW alone.
According to the full Canon 77D specification sheet referenced in the answers, the RAW and RAW+JPEG shot counts were effectively swapped in the table. So this is a documentation error, not a special behavior of the camera.
In short: RAW+JPEG does not save space versus RAW. If a chart says otherwise, it’s a typo or layout mistake.
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