Yeah Smudge, the thing that really got me is when Dankowski couldn't find a dime with a paper staple over the top of it. I know that he is an expert and that it's not uncommon, but getting used to favorite detectors does have it's pluses sometimes too. Still ANY iron masks good targets, especially gold ones.
I usually run my discriminator at zero disk and listen to the sounds. Both of my main detectors (cz70 running in notch but with nothing notched out) and my Compass R&C (running in all-metal) both give me decent readings anyway, even though I analize the cz by ear, and the Compass with a combo of both audio AND meter swing. The Fisher gives me a good grunt or bad grunt on iron, and I can usually tell the difference between big iron, small iron, or a combo of targets together. The Compass is even sweeter, it gives me different sounds if I turn slightly one way or another, or tilt my coil. It's a real honey for sorting out iron over the top (or bottom) of a good target. These two detectors and the little Chinese one are so nearly perfectly deigned that I really have no need for any others, although I have about 15 more hanging on the wall.
When searching the Willamette University campus one day, my friend was with me using iron discrimination on his Whites. He was searching VERY slowly and carefully, and I came in behind him with an old Bounty Hunter vlf-tr, using ZERO DISCRIMINATION. My detector just about blew the speaker out of the box! I dug a rose gold man's signature ring (with no engraving on it) weighing in a 3/4 of an ounce. Anybody knows how much that is worth, I don't need to tell anybody. And yes, it barely gave me a peep when I checked it in discrimination. And it was only 3" deep!
He (Mace) got so angry that he wrapped his detector around a parking meter, then stabbed it with his bayonette, leving the bayonette still stuck through the box, and mailed it back to Whites with a note on saying "I killed it". Whites was good about it and gave him a different detector of his choice.
LL/EM