Gintaras ValatkaJessop 4xDiffration (no longer available, purchased in 2003-4 at Jessops) http://www.jessops.com/accessories/lens-accessories/filters?fh_sort_by=&fh_maxdisplaynrvalues_filter_effect=-1
Motorised diffraction grating from very similar box http://www.ebay.co.uk/itm/like/282093886093
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