The crown caps take care of them selves once you get used the tones and don't over rely on visual target ID. If you ever want to invest in one of the HF coils, that also makes them go away too. If you want more specific hints on how to filter out crown caps let me know or search the Deus forum. CTX is a great water/beach machine and target ID is very accurate but the Deus, besides being light weight, excels at target separation because of its recovery speed and the HF coils make it a mid-conductor vacuum machine. Yes, large and round iron and intact aluminum trash (unbent pull tabs, pull rings, and screw caps), but high conductive coins and most mid-conductive round keeper targets have tones that are unmistakable and, as I said, crown caps, bent tabs, cans, and can slaw have distorted tones that give them away once you have that committed to your brain's muscle memory (which basically takes swing time and recovery of trash in the beginning to make the brain/tone connection).