Canon T3i Manual page 27

Aspects o f M anual E xposure
• ShuFer s peed:
• determines t he l ength o f e ach e xposure ( each
frame)
• Aperture:
• controls t he a mount o f l ight o n t he s ensor
• ISO s peed:
• controls t he s ensi.vity t o l ight