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Many thanks
Yes, it does have three screws. The scope is a AOE. The label describes the unit as a 102mm but upon removal of the Focuser I found the internal measurement to be 125mm! I am guessing the OTA has been incorrectly labeled and that it is a 6" Achromatic scope! Given the origins would be almost certainly Chinese my gues is that it is a 125mm or 6" scope.
So, I checked x3 times the internal measurement at 125mm. Should I order a 6" or 120mm from Bintel? I would like to place the order tonight's as I have some other parts to order from Bintel.
I took the scope outside today to aline the finder scope. I was VERY surprised I was expecting chromatic aberration, there was some purple fringing but it was acceptable. The fringing was more noticible at near focus (terrestrial) and once cranked out to reasonable distances 1km there was very little fringing.
Cheers
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