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Matthew -- You're welcome, let us know how you go with that.
Lee -- Ignorance? Not at all. Generally speaking, refractors usually don't require collimation as far as adjusting the objective lens is concerned. In this case I'm referring to the focuser itself. For best results, you want the draw tube of the focuser to be aligned with the center of the telescopes objective lens. Mine was off by quite a bit after I installed it and some adjustments to the 3 collimation hex screws were required to get it centered.
Looking at the image you've attached, at first glance I would say it looks like drift... but having seen some of your recent images (O Cen for example, which is really good I might add), I'm guessing you would know if this was the case? If you did a relatively short exposure on a bright star, are the results the same?
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