Hi Gary

OK, so essentially the exercise is showing that the metered reading will tend to overexpose blacks and underexpose whites because the meter uses c.18% gray as the reference point for exposure? i.e. the black and white image will both look gray?

Its rather dark now but I'll shoot it tomorrow am on Aperture priority, shutter priority, manual and program and see what the difference is (am intrigued) because I am clearly missing the point about aperture from the origional post unless Rob has found a scene of one of those three colours with 3D feature.

(Am starting to worry I am missing the point here but am wondering if Rob is putting himself to more stress than he needs to!)

What happens if you alter shutter speed in Program mode? surely then the camera will automatically adjust the aperture to bring the exposure back to the metered value? The exif data might change, but since Program mode allows you to alter shutter / aperture settings, then regardless of what the exif data says, you did what the course asked and the end result is the same (?) - an image exposed correctly for the camera's meter reading?