install package gphotofs
user must be member of group plugdev
mountpoint must have write-access for group plugdev
connect camera (PTP protocol)

mount: gphotofs /media/vd1
 ( "mount" shows: 
 gphotofs on /media/vd1 type fuse.gphotofs (rw,nosuid,nodev,user=gerd)

umount: fusermount -u /media/vd1
(see: man gphotofs, man fusermount)