Yeah, the ultraoptix 7x are the same ones that the DK1 uses. I am using http://www.amazon.com/gp/product/B00524H8MC/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B00524H8MC/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1