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Author Message   Milosdevino Tinkerer Username: Milosdevino Post Number: 14 Registered: 03-2010 Rating: N/A Votes: 0 Posted on Friday, January 21, 2011 - 06:37 pm:    You're right, she doesn't have a clue. On all slr cameras the aperture stays wide open until you release the shutter. It would be too hard to see through the lens otherwise. Imagine trying to focus with the apperture set at f22, it would be very dark. Once the shutter is tripped, the mirror flicks up, the apperture stops down to whatever it was set at and the shutter curtains open. Set the shutter to 1/30 or 1/15 and look through the film gate as you set it off. The diaphram will stop down to it's setting. Then show your professor.