I have the Canon XS and 430ex speedlight. I am trying to use extension tubes alond with my 100mm macro lens which makes the lens very long and it sometimes will shadow the subject. What is suggested for this type of shot? I am thinking that I would need something for when outdoors looking for insects. I have a lightbox (pic below but I did not use the extension tubes) so when at home I am OK. Could I build out a snoot with a diffuser or do these cheap lightrings work? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140388172058&rvr_id=&crlp=1_263602_263622&UA=WXI6&GUID=49fda7aa1270a0265333bdc3ff905173&itemid=140388172058&ff4=263602_263622 What do you all do in these situations?