Geoff - thanks - its in consideration then!
Jase - Taa, the SCT is for DSO - the apo would be for wide field, but being that I am totally unused to wide field I am unaware of its specific requirements - whatever they may be. So if someone would say - flatness of field is an issue with apo's that you don't get with SCTs - you need X to correct it - it would be lessons learnt. It was a catch all query!
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