Re: What's the effect of imaging through jet stream?
Consistent problems suggest hardware problems, polar alignment, PEC curve issues, flexure, poor guiding parameters, this sort of thing in that they impact everything consistently. Unusual or rare problems like you are sharing suggest transient issues the most likely being seeing. I work with a 17" telescope at .63"/pixel, I know how seeing can ruin things. If the system returns consistent results and then all of a sudden doesn't, first thought is seeing. The fact that your stars were not messed up in one consistent direction is a clue. I did have a time where my images were horrible all of a sudden and then get good. Finally went out and found a rather large owl sitting on the edge of the telescope upper ring. Luckily there was no deposit on the primary mirror.
There are numerous reference on the impact of seeing and how professionals monitor and search for sites with good seeing.
Mike J. Shade
Mike J. Shade Photography:
In War: Resolution
In Defeat: Defiance
In Victory: Magnanimity
In Peace: Goodwill
Sir Winston Churchill
Already, in the gathering dusk, a few of the stars are turning on their lights.
Vega, the brightest one, is now dropping towards the west. Can it be half
a year since I watched her April rising in the east? Low in the southwest
Antares blinks a sad farwell to fall...
Leslie Peltier, Starlight Nights
International Dark Sky Association: www.darksky.org
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