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This is weird Robert. I get the same thing sometimes - what looks like rotation in the corners. I use a f/6.3 reducer on my C8 too. I know I've had great alignment because I sat there with StarTarg looking at a star - no guiding and without movement in my reticle for some 15 minutes or more. That to me indicates pretty darn good drift alignment. My next night out will see me do some shots with and some without the reducer. I'm still leaning toward it being a form of spherical aberration rather than rotation, but I guess we'll see.
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