I lock the G2 down to a focused line at about 15 feet or 30 feet it doesn't really matter much, focused at 15-30 it is almost focused at infinity, it's a fraction of a turns difference. 15 feet is where I align my 6X pair, I don't adjust it at all, only if I add the beam expander can I do any focusing.
It will light the bag from point blank to about 35 feet without the expander.
With the expander it will light the bag further.
It's the best compromise for my purpose which is burning, it also makes a nice NDB7875 with a 3 element focused to infinity looking beam only brighter.
It won't look much different focusing the G2 to infinity, but it takes a little bit out of the short range, you can experiment and see, but the G2 only takes a fraction of a turn to go from it's sharpest at 15 feet or infinity.
With a big beam expander after this correction it will be ready to get a tight spot for a long way.
You can see in this video it lights the paper at each end and will anywhere in the middle, the line width does grow, but much slower than it did.
Adding a 2 lens expander after this will yield a good result with a shorter line than the same expander without this correction.
You just can't do it with 1 strong lens, it would focus it very short in front, maybe with a very low power lens or a telescopic reduction, I have not tested any telescopic reductions.