Stumbled accross a new app for the ipad/iphone. It is called "My Lenses". Only costs 1 dollar.
Fairly simple, but it works well. It will store your current inventory of lenses, then plot focal-length vs aperture for each. Pretty cool.
Link to app store
Enjoy...
Note - currently only for Canon lenses. Developer says they will add other manufacturers in future.
Here is a sample plot for my lenses:

Fairly simple, but it works well. It will store your current inventory of lenses, then plot focal-length vs aperture for each. Pretty cool.
Link to app store
Enjoy...
Note - currently only for Canon lenses. Developer says they will add other manufacturers in future.
Here is a sample plot for my lenses:

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