I used the oen that comes with my DR its a 18-55mm and i had 3 close up filters on it a +1,+2,+4 hehe
im not sure how to do all the math wiht camera lenses and focal ratios and so on so forth i need to find a good book that teachs about the mechanics right now im jsut playing around...... i had the Fec setting about -1.5 so the flash wouldnt over do the poor guy, "gotta love russian firmware" but yea i think it came out ok i cant wait to see some more bugs....