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Yeah, it's the optic window, if you remove the original low profile nosepiece, which looks to have the window glued into it and put on a normal t-thread to 2" nosepiece with a 2" IR filter on the end, thereby moving the filter further from the sensor, the halo gets bigger but a whole lot weaker. That basically solves the problem, however it may introduce frosting problems as the camber is now a lot bigger and not sealed as well, the filter will leak. Sort of a Catch 22. But it's only there with bright stars anyway.
Glad you all like it.
Last edited by Tandum; 29-11-2009 at 11:20 PM.
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