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Hmmm, Lewis, I'd be impressed if that was at a long focal length with a small image scale. Guiding with a wide field refractor either OAG or just as a guide scope will produce those sort of results often. If not you have the wrong settings and you need to fine tune the mount. When I was using the FSQ with OAG on the PME it would flat line like that all the time. Now I have a 12" f4 at 0.92" on that mount it does not look really flat anymore. A long focal length will show up the errors in the mount and the guiding real quick.
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