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I forgot to add I have once added a diagonal (just another way of extending the distance) in the train. Needs to be great seeing though.
I'd suggest trying all possible image scales to determine which is best on the night of capture.
Train order: scope-barlow-ext.tube(s) camera, yup.
So in my case: anything below 4/10 I go the 2X barlow & only one ext. tube. Works for me.
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