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Thanks John,
With SA, is this what flatteners fix? or is field flatness different to SA?
I thought of the focuser as that's usually the weak link in these scopes, but I was just looking at something as a portable secondary scope as my primary is a 10inch F4 with a motorized moonlite.
I will motorize the focuser for this and use threaded drawtubes all the way.
I will check the spacing for the reducer/flattener.
Its currently 55mm as I use a Baader mpcc with my OAG/filterwheel. I'm not sure if the flatteners need more than this.
Cheers
Alistair
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