I read a article years ago, that said it made no difference in light transmition,the U.S.A. uses inches & Europe uses milometers, that's just what size they came up with. Now you will gain adjustment range from the larger tube, from what I was told. They are heavier, but on some set ups they just look cooler. All other things being equal, I would go with a 1" tube for half the price. But that's just me. :)
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