Afaik you can open the .cam file with S3D or merge it with the Cameras.GR2 file in GoblinEditor located in SilentHunter 5 directory.
This file i use for first steps:
http://www.subsim.com/radioroom/down...o=file&id=1571
Thanks to elanaiba for the mod and sharing the knowhow.
Now it have zoom also in next/previous unit cam and i love it.
Small problems with flickering textures, but nice screenshots of your sub.
http://www.filefront.com/16146581/S3D_v099.rar/
offtopic: the camera file with zoom at the unit cam:
http://www.filefront.com/16604351/Camera.zip/