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The iTunes App Store offers downloads of CanonSGLens for Apple iPhone, iPod touch, or iPad for free. That's the best deal I've seen for this app, which was released two weeks ago. It features detailed lens specifications of all Canon EF and EF-S lenses sold in Singapore and includes an interactive simulator that allows you to compare the field of view of two camera-lens combinations.
"That's the best deal I've seen for this app, which was released two weeks ago."
When they pay me to download it, than let me know ;)