Changing file numbering
With the Rebel XSi/450D, you can set the camera to number images using one of three options: Continuous, Auto reset, and Manual reset. These options allow you to number your images sequentially, to restart numbering each time you change the media card, or to choose to manually reset numbering. Here is how the options work:
♦ Continuous file numbering. This is the default option for file numbering on the XSi/450D where the camera stores the last highest image number internally to continue a sequential numbering system. Images are numbered sequentially with a unique, four-digit number from 0001 to 9999. The camera automatically creates a folder on the SD/SDHC card named 101. It stores images in the folder until you shoot image number 9999. At that point, the camera creates a new folder named 102, and images you shoot restart with number 0001.
This works great until you insert an SD/SDHC card that has images on it. When you take another picture, the new image file number continues from the highest numbered image that's already stored on the card if it is higher than the highest image number stored in the camera's memory. In other words, the camera uses the highest number whether that high number is stored in internal memory or is stored on the card. If you want to continue continuous numbering, insert only formatted/empty SD/SDHC cards into the camera.
With unique filenames, managing and organizing images on the computer are easy, because up to image number 9999, you don't have to worry about having images with the filename on your computer.
♦ Auto reset. With this option, file numbering restarts at 0001 each time you insert a different SD/ SDHC card. If the SD/SDHC card has images stored on it, then numbering continues from the highest image number stored on the card. So if you want the images to always begin at 0001 on each SD/SDHC card, then be sure to insert freshly formatted SD/SDHC cards each time you replace the card. If you like to organize images by media card, this is a useful option. However, if you use this option, be aware that multiple images that you store on the computer will have the same number or filename. This means that you should create separate folders on the computer and follow scrupulous folder organization to avoid filename conflicts and potential overwriting of images that have the same filename.
♦ Manual reset. With this option, the camera creates a new folder on the SD/SDHC card, and images are saved to the new folder starting at 0001. After Manual reset, file numbering returns to Continuous or Auto reset, based on what you used previously. The Manual reset option is handy if you want the camera to create separate folders for images that you take over a span of several days.
On the XSi/450D, up to 999 folders can be 2. created with up to 9,999 images stored in each folder. If you reach these capacities, a message appears telling you to change the SD/SDHC card even if there is room remaining on the card. Until you change the SD/SDHC card, you can't continue shooting.
To change the file-numbering method on the XSi/450D, follow these steps:
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