I had my camera set up over a cow carcass over a 3 day period and got 87 pics which all but 4 of them were coyotes. And this was behind my parents house where they have lived since i was 14 and i am now 23 and over that 9 year period i have seen 3 coyotes all of which when i was hunting other game and my dad has killed 2 there over rabbit carcasses less than 50 yards behind the house.And you say your place has an abundance of coyotes i would think you would easily have alot more pics than that but i can say that i dont think your flash will scare them a bit. I have never had a problem with my flash scaring away any game. Here is a day and night pics of that 3 day period if i can get it to work right.