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Hi tom, I personally like a full face shield with ear plugs set in very loose. I've had hot metal more than once bounce off something and end up in my ear. As too shade #, it's a good rule of thumb to use the darkest that "you" can easy see with. I've always needed one shade darker than the average user and I've seen some people that require two shades lighter than average person. I've also seen guys use a oxy/acet torch with clear lens and I personally think thats a bad idea. There's just too much brite light to contend with, close to looking at the sun behind a cloud and I wouldn't do that either. Another good rule is when you finsh the cut, close your eyes tightly and if you can see any "stars" "circles", etc, then you need to use a darker lens. The best line for a accurate cut is a line made by a scratch awl or dividers for circles, as you then can get a fine cut as it's easy to see when you cross the line. The wider the line is the more ragged the finish cut. Cuts made under magnification will be more accurate than without. Even with a 2x lens the cut will look ragged on scribed line. The problem here is then your eye too working distance is greatly reduced. A cheap pair of Wal-Mart reading glasses with a colored face shield works well. T_Bone
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