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This is a cautionary tale about how experimenting with custom functions can significantly change how your pictures look. In this case I was getting very overexposed pictures in aperture priority (Av) when using a flash and high speed sync (HSS). Setting high speed sync on your flash allows you or your camera to select a …

All DSLR cameras including the EOS models have a restriction when using flash. Due to the use of a focal plane shutter mechanism there is a maximum shutter speed that can be used with flash. Go faster than the ‘sync speed’ of your camera and you often see black bands on your image. Canon has …