Quote:
Originally Posted by strongmanmike
On ya Richardo, I am really enjoying this narrowband work, the options are endless and the artistic side can come out  , it is a good option in poor seeing conditions too. At F3.8 having a 37mmX 37mm chip in a heavy camera and filterwheel really does push the envelope with this scope design...but so far it has been fun and produced some good results. Without an obso though, I certainly haven't enjoyed the crappy and more worryingly, unpredictable Newcastle weather 
Re the off axis guider, won't help with this sort of flexure, rather I think we are talking mechanical flexure in the image train distorting the star images, not differential flexure causing guide errors.
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Yes I reckon narrow band is great also, it lets you play master of your colour destiny..
..
Any comments as to 'oh that's too, or not enough...' then you can say, 'my image, my taste, my artistic license
' Simple.
I think you are right in saying that there is some sort of flex in the imaging train... You know that with the AP on board there is no probs..
For me after years of tracking my issue down, I've narrowed it down to a few things after upgrading my ML focuser to a feather Touch ... quite possibly the tube is flexing somewhere... or even the spider is a bit weak (might have to build my own as there arn't any good third party ones around other than a Van Slyke....) but I'm relatively happy with 4- 5 min subs as this seems quite adequate for the F4 system and what I'm after in the way of appearance imo. Just now and then I see a slight elongation to the stars in the bottom L/H corner.
All good fun and you're doing some great work so far with this scope even in your very iffy skies. A observatory would be nice for you though!
All the best
Rich