The ONAG from InnovationsForesight uses Infra Red light to guide with. I bought an IR filter similar to
http://www.ebay.com.au/itm/25mm-25-m...oAAMXQLw1RyrOX and, if I ever get a clear night, will give it a try. They (IF) say that IR guiding also reduces the effect of seeing which is my bug-bear.
Charles