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| p.1 #3 · Continuous file numbers...accurate for shutter count? |
Not with the 7D. The files are numbered something like 001-xxxx where 001 is the folder and xxxx are sequential frame numbers from 0001 to 9999. When you are shooting with a given card, the file numbering goes from 001-9999 to 002-0001, then sequentially from there.
Problem is, when you format the card, the folder number returns to 001. So if you format your cards on a regular basis like you should, and you don't rename your files, it's conceivable that you end up with photos with the same file name every series of 10,000 frames.
My 7D is on file name 001-4000 or so. I've lost count, that's either 64,000 or 74,000, as I have rolled over 9999 a few times.
Also as Lars mentioned, if you juggle cards between cameras, the 7D (all Canons, I think) will look at the last frame shot on that card (even if you've formatted the card in camera), and start from there if the number is higher. For example, if your last file name you shot with your 7D is 001-4000, and then you switch cards and the new card you insert in your 7D last had a file name of 001-6000, the next frame shot by the 7D will be 001-6001.