The default UDEV rules do not allow members of the PLUGDEV or USB groups to access USB photocameras. At least not my Canon Powershot. The UDEV rule SUBSYSTEM=="usb_device", PROGRAM="/bin/sh -c 'K=%k; K=$${K#usbdev}; printf bus/usb/%%03i/%%03i $${K%%%%.*} $${K#*.}'", NAME="%c", MODE="0644" needs to be changed to SUBSYSTEM=="usb_device", PROGRAM="/bin/sh -c 'K=%k; K=$${K#usbdev}; printf bus/usb/%%03i/%%03i $${K%%%%.*} $${K#*.}'", NAME="%c", MODE="0660", GROUP="plugdev" for USB photocamera to be accessible. This used to work some time ago, I guess the default Gentoo UDEV rules were changed. Using udev-087-r1 by the way.
*** This bug has been marked as a duplicate of 134691 ***