I just buy it, and I like it very much, that is a nice application and all, it's easily and helpful for me to study every lens. so, I want share it.

    I really like it, with this tools, I find many excellent photos, at first, I want give up my canon 17-85 EF-IS lens, but when I search photo in Lens Gallery, I find many great photo that taken by this lens, I understand lens only is a tool, the most important things is you must think and think before you shoot.

Link for iTunes App Store:
http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=293107210&mt=8