I recently acquired a lovely Olympus Trip, and I already had an old Olympus T20 flash that works really well with it. The flash is TTL compatible, but I obviously can only use the two auto modes and manual on the Trip. I also carry around a Nikon F100, and have a small SB23 speedlight which is manual or TTL (no auto modes). It seems silly to carry around both flashes. There is obviously no issue with using the SB23 on the Olympus trip as it has a single flash contact in the middle of the shoe, but I get no auto modes, so I was leaning towards carrying the T20 so that I get two auto modes and manual on both the Trip and the F100. I've always liked Olympus flashes, they just seem reliable, and I get as good results from their auto modes as I do from TTL. I also like the way the sensor is hidden inside the 'O' of 'Olympus'. You can tell whoever designed that had a good sense of aesthetics! However, the TTL contacts and 'ready' contact on the Olympus are obviously in different places to the Nikon, so I was concerned I might damage the F100 by using the Olympus flash. Any suggestions if this is a good idea or not?