Quote:
Originally Posted by multiweb
 Ok I get it now. It's much narrower than what I thought and it's in between blue and green so I can't combine any of the filters I have to get me that range. It's in the overlap zone. I wish you could arrange filters some how and do an exclusion rather than an union. |
Stacked filters should subtract. eg, Astrodon Gen 2 Blue+Green (both E and I series) should only allow about 490 to 510nm There is no overlap in the bandpass with their Green and Red filters.