Tube Diameter

Many riflemen don't realize that scope tubes are not necessarily the same diameter. While the great majority of high-power scope tubes are 1-inch (25mm) wide, an ever-growing number are 30mm, a reflection of the influence of European designs, which frequently employ the wider tube widths. Schmidt & Bender and Zeiss have developed even wider 34mm tubes for scopes intended for .50-caliber rifles.

The 30mm tube (right) allows more light passage than a 1-inch tube.

The benefits of a wider tube are threefold. First, becausc the transmitted light need not "bend" so much when traveling down the tube, there will in theory be less distortion around the edges and a crisper image. Second, the wider internal lenses will allow the unhindered passage of more light, with a brighter view reaching the shooter's eye. Third, a wider tube allows more elevation A'lOAs for long-range shooting.

All these arc true to some degree, but not necessarily enough to make a lot of difference in performance. For example, there must be a boost of at least 10 percent in light before the human eye can detect any difference. And a good-quality scopc should have very little peripheral distortion anyway.

Still, if your budget can handle it, these 30mm tubes are better and worth having.

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Hunting Mastery Selected Tips

Hunting Mastery Selected Tips

Deer hunting is an interesting thing that reminds you of those golden old ages of 19th centuries, where a handsome hunk well equipped with all hunting material rides on horse searching for his target animal either for the purpose of displaying his masculine powers or for enticing and wooing his lady love.

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