how do i take a photo.
 

on those missions where you have to take a photo of a jap harbour or something how do i take the photo? It's greyed out and says i need to lockon on to a ship with either periscope to take a photo...how do i lockon?

And of course the manual says nothing about it...

Put the periscope crosshairs on the ship. Hit the "L" key to lock. Click the camera on the interface on the bottom. Not all ships in the harbor are worth a picture. Sometimes it is just one that you need to photograph.

like you would be firing a torpedo using the auto target line it up in your scope then hit the red button to lock in the target, this will light up the camera icon so you can take the picture. usually you need to take at least 2 or 3 pictures.

great thanks guys