From Canon Singapore
In case you missed it in the holiday rush. Canon Singapore has released an interactive reference iOS app for all Canon EF & EF-S lenses.
CanonSGLens is a free Canon Singapore App that features detailed lens specifications of all Canon EF and EF-S lenses sold in Singapore. The application also contains a unique interactive simulator that allows you to compare the field of view of two camera-lens combinations whereby the cameras and lenses can be any Canon EOS digital SLR and lens.