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Old November 4, 2012, 06:14 PM   #4
Brian Pfleuger
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Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,400

30mm tube, yeah. That's the tube size. Your current scope has a 1" tube but a 20mm objective. The Weaver has a 30mm tube and a 24mm objective.

So, the Weaver is a 1-5x24, your current scope is a 1-4x20.

The Weaver should have considerably better light gathering.

30mm is 1.18 inches. The area of a 1" tube is .7853 sq/inches. The area of a 30mm tube is 1.093 sq/inches. So the 30mm tube is almost 40% bigger.

A 20mm is objective is .787 sq.inches, while a 24mm is .944 sq/inches. The 20mm is .486 sq/inches and the 24 is .700 inches, or 44% bigger.

Curious that the scope would have an objective smaller than the tube. I've never noticed one like that before but I pay no never mind to such small scopes.

(You'd need new rings too, for a 30mm tube.)
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