The next picture file written by a camera like Canon 5D Mark II will be IMG_2001.JPG. This results in a much lower perceived shutter count than the true shutter count.įor example, let's say the filename is edited from IMG_9000.JPG to IMG_2000.JPG. Some cameras, such as the Canon 5D Mark II, will use the card filename to construct the name for the next picture.

The file name is edited to lower the numerical suffix.

If a blank flash card is inserted afterwards, some cameras like the Canon 60D will continue previous filename numbering for example, will write file IMG_4102.JPG when shutter count is 3752.

The shutter count in this case will be only 3751. If a new flash card is inserted with a file IMG_4100.JPG, then the next picture taken with the camera will be written under IMG_4101.JPG. The numbering then continues with this higher suffix.įor example, if the last file written by the camera was IMG_3750.JPG, this indicates that the shutter count is 3750.

A new flash card is inserted containing a picture file with higher numerical suffix.

Here are examples when the filename does not indicate the true number of pictures taken with the camera. Newer cameras store more images in each folder, so the mathematics change.Using numeric suffix of filenames written by the camera on a flash card is not equivalent to camera's shutter count (the suffix resets to 0 after 9999). Modulo 100 may sound frightening, but in reality it means just take the two right hand digits.

Shutter Count = (folder number-100)*100 + modulo 100 file number.

Split the image number into two parts: the last 4 digits (call this file number) and the first three folder number.

Thus to convert the image number to the number of shots taken we need to do the following: A twist is that looking at one of the early images I took with this camera is that the folder numbers start at 100 rather than 0. The folders each hold 100 files so the first 3 digits increment once every 100 images to reflect the new folder number while the last 4 digits increase to 9999 then rollover to 0. Under DCIM there are two folders at present: 291CANON and 292CANON. I then realised that the first 3 digits are in fact the folder number on the memory card.

That makes more sense – the last image was IMG_9222.JPG. One EXIF data tool reports the number as 292-9222. On my 10D, it shows 2929222 approaching 3 million shots which is clearly wrong. The number of shutter actuations on older Canon cameras is encoded in the 'Image Number’.

Shutter count canon 600d online