Yes, it’s better to take pictures without the flash, or at the very least, without the basic pop-up flash. But if you’re in no position to adjust your ISO settings, and stabilize the camera for a longer exposure, you really have to. Thing is, there’s a very limited range to flashes, seeing as the light goes off in all directions. The Rogue Safari DSLR Pop-up Flash Booster uses a special Fresnel lens to focus the light from the existing flash, and project it outwards up to 8 times as far as normal. Used in conjunction with 100mm+ lenses, you should be able to catch a decent shot of the raccoons stealing your trash without even having to leave your front porch.
It’s not compatible with ever model of camera, but if your device is a Canon or Nikon in APS-C or DX format DSLR built in the past five years, you should be good to go. It’s $35.