Dufus
Sorry about your health issues.
I know zilch about the 1500. Never actually seen one. Of course I've never actually used one either. I did use another what I'll call an alphabet detector for a couple of hours or so that told me about every minute or so that the coil was over a ring. All the 40 or so "rings" I dug were not "rings" none of them.
I do know a little about produce and if you go buy those new red potato's they are graded by size. A's are bigger than B's and B's are what I like to cook with my green beans.
So when your talking ''B'' sized image and ''A'' sized image" I assume one is larger than the other.....just like the potato's.
My hunting grounds are limited, as to where I can expect to find numerous targets, so I hunt the same turf repeatedly. I dig alot of trash just to quieten down the area, so I don't have to repeatedly find the same bottle tops over and over again. Just last night I cleaned up 3 tot lots, not of coins but mostly pencils!!!
Every public place I went had some kind of activity going on, JV football, a picnic, basketball, and soccer practice........so I went and did maintenance on "my" tot lots. Did I expect to find anything after just having just hunted them within a few days......nope. But I got lots of potential pseudo nickels, and gold rings before they found their way to the bottom of the bark pit.........LOL.......so I pick them up when they are shallow, before they get deep. Rewards........nope got a total of 35 cents last night
none of which came out of the lots.
I keep my tot lots as sterile as a gelding, and when something metal is in there I know about it. Would I go to the trouble if I was only going to hunt them once.....probably not.
HH
QH