Not to nit pick James, but I think countdown is right for the 3/4 inch blade. The issue is that you lose a ton of light before you get to the tip with the smaller ID. With a 10 degree lens any blades longer than 36 inches are MUCH dimmer at the tip (not the dark spot) of the blade.
I tried a 5 degree lens and had better results with the narrower tube. Its like this count, if you don't want to go out of your way to get a 3 degree lens then the 5 degree is fine. If you can get the 3 degree its the way to go.
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