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Hi, What can you do during a rainy and boring day? Yes, write something about about old project ideas that newer have been realized. For many years I have been wondering how to construct a beam splitter system to make more efficient use of exposure time when doing color or narrow band imaging. I have today written down my ideas here: http://astrofriend.eu/astronomy/projects/project-high-efficiency-narrow-band-imaging/project-high-efficiency-narrow-band-imaging.html There are a lot of interesting links there too to read. /Lars