Thanks for you replies.
I liked the idea of a day and night scope, I have practical uses for both. But you are right, more optics could mean more distortion.
3.5 inch could get close to the moon but maybe nothing else.
I'll have a look around to see what else is available. I've seen a picture of a 10inch scope... very cumbersome (and maybe expensive?)
Maybe somewhere around 5" will do me for now.
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