100
optimal value must be carefully evaluated. ISO can be set between 100 and
1600 but for APS-C sized detectors, like the ones used in the EOS 450D, ISO
values higher than 400 should be avoided;
Metering Mode, this setting refers to the way in which a camera determines
the exposure but it is not applicable in manual mode;
ImageQuality, refers to how the image is saved to storage support. Options
available are JPEG (low, medium and high quality) and RAW mode. In RAW
mode images are not compressed and saved in a proprietary format (.cr2).
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