I recently downloaded the Nikon Lenses app on my iPhone. The iphone App supports iOS 3.0 or later and is compatible with iphone, iPod Touch and iPad. This app is a guide to Nikon’s current lineup of F-Mount lenses used by both Nikon’s digital and film SLR cameras.You can either view all the lenses at a glance or you can further view in a selected category and sort in terms of Aperture, Focal Length and ESP (Estimated Retail Price). Each lens has a detail page which provides links to the Nikon web page detailing the lens, reviews of the lens from third parties (if available – brand new lenses might not have reviews yet) and where to rent the lens (available United States only).
I personally like the application being a Nikon fan. The app is available free and they do update to keep up with the new line of Nikon lenses. The latest version 1.4 has Retina Display support – higher resolution images of lens and includes information on AF-S DX Micro NIKKOR 40mm f/2.8G.
You can check their site here or search for Nikon Lenses on iTunes App store