Emil author of AutoStakkert! 2.1 (check out the beta versions!). Webcam Astrophotography - Deepsky, ISS, Sun, Moon & Planetary Images,
Quote:I think it's a problem of (local) seeing, and/or optics alignment. I don't think it is stacking, unless perhaps you used some really weird stackign parameters, but then I would expect seems to appear, not blurring. I have never seen any results like these caused by stacking (although that doesn't mean it can't happen, just that I have never seen it before).But Sams suggestion is good to verify that: use a single - large - alignment point, and see what the result look like.
Quote:Did you take more images, of so, what do they look like?
Quote:Was the telescope perhaps not at ambient temperature (when the scope was not isolated)?How was the collimation of your scope?
1987 Meade LX3 2120 10" SCT on hypertuned EQ6 Pro Baader Self-Mod Canon XS_CLS Clip Filter DSI color_Orion ST80 Coulter 10" Compact Odessey Dob http://www.astrobin.com/users/shawnhar
ToxMan "Violence is not the answer. Poison is the answer."
32.2N 110.9W (Elev 2582 ft)
Celestron C11 Carbon Fiber (Veneno)
CI-700 EQ Mount Big Barlow 2x, Powermate 2.5x, Uranoport 1.5x, ES 3x barlows
DMK31, DMK21, Nautilus filter wheel, Orion filter set
FeatherTouch Focuser, MicroTouch Focus Controller
Starizona Cool Edge