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Tony,
I went for the FULL full spectrum mod - both filters removed in the Canon 1000D.
I needed a Clear clip in filter to focus standard lenses.
The benefit for me was to allow spectroscopy across the whole visible spectrum, not just the improvement to the Ha region.
If you're doing normal AP a FULL spectrum mod is unnecessary.
The remaining front anti alias/ dust shake filter cuts off above 700nm.
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