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Hi Peter.
From what I can see, both filters may be removed if using reflecting optics - for reasons scientific, focus is not a problem. Conversely, refracting optics require a filter because focus is impossible with such a broad spectrum. I have attempted this with interesting results, but not focus.
The camera needs a filter of some sort to retain autofocus. Quite separate from the reflecting/refracting focus issue.
I remove both filters and fit a UV/IR Astronomik clip-in, which satisfies both requirements - optical and auto-focus.
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