Greetings to all--I have recently fitted a crayford style focusser to my 10" newt and centred the secondary, collimated the scope and performed star test all seems well.
My problem is I can see the edge of the focusser draw tube as a thin crescent from 12 o'clock to 6 o'clock primary mirror side.
It is really bugging me as it catches your eye everytime I look down the focusser. Sould it be visible as a thin circle all the way round? /not at all? Or is something out of allignment?
Maybe I,m worrying about nothing as everything else is ok.
