It is an open (GPL) framework for developing extensions to the official. Initially developed for filmmakers, it now has functionality for both photo and video enthusiasts, including manual audio, zebras, focus assist tools, bracketing, motion detection and much more. Newer cameras store more images in each folder, so the mathematics change. Magic Lantern is an enhancement atop of Canon's firmware that frees your Canon DSLR, allowing you to use many useful features. 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.
What Version Is My Firmware Turn on the camera and go to Menu to find the firmware version on your Canon DSLR. You might have a camera lying around that has an expired warranty that you could use for this. On my 10D, it shows 2929222 approaching 3 million shots which is clearly wrong. Canon will not fix any issues with Magic Lantern crashing your camera.
The number of shutter actuations on older Canon cameras is encoded in the 'Image Number’.
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