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Colin, thank you. I didn't think of that as that spot is used up by the light pollution filter. But with narrowband filter I don't need the light pollution filter.
And you opened my eyes, I also could screw a 2" filter into the flattener. That spot is currently taken by the IR/UV cut filter :-)
Again thank you guys.
edit:
I suppose the whole exercise will eventually end up with me buying a CCD at some stage, like Glen did. The point now is buying filters etc that can be used in the future.
Last edited by luka; 25-05-2016 at 01:08 AM.
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