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Fabulous images Mike. Amazing resolution on that NGC1365 lookalike galaxy.
The vertical and horizontal line looks like a reflection of the filter from the bright light of Alnitak.
I suggest blackening the edges of your filter.
I use a black permanent marker pen. I am told you can get Testors flat black paint in a pen (model car paint). I'll follow it up as Tim Khan knows where you can order one. It'd be a worthwhile project to blacken all your filters. It all helps. There is a paper on the Edmunds Scientific site about the effects unblackened edges can cause. I haven't read it myself though.
Greg.
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