http://www.nikonchat.com/coolpix-telephoto-lenses/

so the lens can be used for my Nikon E8400 digital camera?
I have Nikon Coolpix E8400, I bought it, but there was no additional lens with it so I want to know what type of lenses I can use? I am not a professional photographer so some help would be appreciated … any model or type?? I prefer buy telephoto zoom lens focus No I'm not sorry to say that changing the lens of the camera itself, I mean buy n attach to it ….. I'm not good at English sorry
If you have a manual that should have found this information – Converter Lens (requires lens adapter ring) • FC-E9 fi Sheye converter (0.2 x) • WC-E75 wide converter lens (0.75 x) • Tele-converter TC E3ED (3 ×) • Telephoto Converter TC-E3PF (3 x) Lens Adapter Rings • Ring UR-E14 Lens Adapter for WC-E75 • UR-E15 adapter ring for the purpose of TC-E3ED and TC-E3PF • UR-E16 lens adapter ring for FC-E9 availability can be a problem, however, deal with your local Nikon, Craigslist or eBay.
Nikon Coolpix P500 – Review