[Don Pensack]

Here's a few sites to explore:
http://www.andcorp.com/
http://www.scopereviews.com/page3h.html
http://www.astrosurf.org/buil/filters/curves.htm
http://www.astronomik.com/english/enghome.html
http://www.astro-physics.com/index.h.../baaderfilters
http://www.cloudynights.com/ubbthrea...t=1&PHPSESSID=
http://www.celestron.com/prod_pgs/ac...ccessories.htm
http://www.customscientific.com/
http://www.omegafiltersebuyer.com/servlet/StoreFront
http://www.astrosurf.org/buil/filters/curves.htm
http://www.cloudynights.com/item.php?item_id=1520
http://groups.yahoo.com/group/astron...ts/message/140
http://www.astroamateur.de/filter/
http://sciastro.net/portia/advice/filters.htm
http://www.samirkharusi.net/filters.html
http://www.clearvueoptics.com/focal_reducers.htm
http://www.sciencecenter.net/hutech/idas/lps.htm
http://pages.sbcglobal.net/raycash/filters.htm
http://www.cloudynights.com/item.php?item_id=387
http://www.cloudynights.com/item.php...d=63&pr=2x9x42
http://www.astronexus.com/gatfaq/filters.php
http://www.sciencecenter.net/hutech/idas/lps2.htm
http://www.lumicon.com/
http://www.meade.com/catalog/meade_4...ar_filters.htm
http://www.astrosurf.org/lombry/reports-filters-dso.htm
http://www.sas.org.au/filters.htm
http://www.schneideroptics.com/filte...l_photography/
http://www.siriusoptics.com/
http://oit.williams.edu/nebulae/browse.cfm
http://www.vernonscope.com/frame_astronomical.html
http://home.freeuk.com/m.gavin/grism2.htm

Have fun.
Don