So, I just did the fire by magnification elective for bushclass. I used punkwood with a feather stick for one and chaga with date palm frond for the other. I also used one of those cheepo magnifier cards for one and a two inch magnifying glass for the other. I had a bit of trouble with a single piece of punk wood. Darn thing kept going out! I ended up bringing out my punk wood tin, which worked a charm. As a kid, i used to burn stuff all the time. In fact, a couple summers ago, a buddy and I had a contest to see who could burn through a board fasted using a magnifier. Of course, those brass/copper/steel hudson bay tobacco tins have a magnifier built right in. But i'm curious... they seem to have very limited potential. I mean, dark/rain/cloudy/overhead cover you can forget it. Where as a flint/steel set or ferro rod seems much more versatile.