There is so much clutter in the photogrpahy app category and so many bad filter apps out there (how many apps that add heart borders does the world need?) that it is truly refreshing when you find something that provides fast information to things you want. Occasionally I stumble across a super simple iOS app for my iPhone that actually makes me happy. For that reason and more, the Canon Lenses app is a bit of fresh air.
The app is super simple, tidy, informative, and free. The basic version offers a full list of the current Canon lens range which can be sorted by a number of filters including lens type, focal length, or estimated street price. That last one is always pretty depressing. When you select a lens, a new window appears offering build information and all the basics from filter size to number of blades, to aperture details. Even more helpful is a very handy list of links to lens reviews from most major photography websites as well as some I have never heard of before, but found helpful. This saves you the time of searching the web for reviews and in-the-field feedback on all of this pricey glass.
A .99 upgrade will add a wish list feature, remove advertisements, and allow you to compare lens features. I have been using the app for sometime now and have seen a number of updates and never experienced any technical difficulties. I think current rebate and comparative pricing info as seen on sites like Canon Rumors would be an excellent addition to this app. It would be another time saver when you actually want to see the current pricing on lenses.
The same developer also makes apps for Nikon Lenses and Tokina Lenses with identical functionality. Let your lens research commence!