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Robin and Martin - the images I posted all have no LPS filter in the imaging train - took it out of the equation to simplify things.
I think the most telling fact is that Image No.3 with no reducer and no LPS filter in place has a reflection.
So if I do the 'look up the tube' test and see some form of reflection within the optical tube - where does that leave me exactly? What do I do - flock the baffle? Doesn't seem like there's much else I can do!
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