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Thank you JA and thank you Lewis.
Lewis I am driven to short subs mainly because of poor polar alignment but the experience using short subs has been interesting particularly in the city where sky glow limits the exposure or the iso.
I still have not got my auto guide working which simply needs a bit of time outside but when I get the rarity of a clear sky I opt to get something unguided and forget about any attention to making the auto guide work...plus before I get into that the mounts both of them need a pull down as each can be improved upon.
My main problem is I just aint as good as I used to be and everything is such an effort...
Anyways I am happy that at least under current procedures that noise is not that big a problem...I hope the dithering helped but I need a with and without test I guess.
Thanks again for all the help from all.
Alex
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