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Reasons listed so far ,
adjustment , this also varies greatly among brand and model with same size tube
light gathering , glass quilty trumps size , now same glass quilty in a bigger tube and obj. will gather light better , but can your eye tell it ?
If one really wants a side parellax than a 30mm is the choice

Last edited by ldholton; 02/26/15.
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Why are people averse to a 30mm tube? Why is a 25.4mm tube so appealing?

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I like my scopes to look like a headlight on a model T.

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Originally Posted by dogcatcher223
Why are people averse to a 30mm tube? Why is a 25.4mm tube so appealing?


I'm of the same mind. I like 30mm tubes and see no advantage to 1" scopes. Weight isn't a factor, the difference is insignificant and looking at leupold's lineup they actually show some 30mm tube scopes (4.5-14x50) to be a half oz. lighter than the same scope with a 1" tube. All things being equal the 30mm tube is going to be stronger, simple physics dictates that. I don't see a downside to a 30mm tube.

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A 30mm tube is stronger than a 1" when they weigh the same?
I would think the wall thickness would be a higher value on the smaller diameter tube when the weight is equal.
So increasing the diameter and decreasing the wall thickness makes a tube stronger?
And stronger meaning ability to resist flex, or what?
I don't know the answer, just asking the question.
Seems like it would be somewhat of a wash.

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Target acquisition is faster-with 40% bigger viewing area through the tube.



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Originally Posted by BMT
Target acquisition is faster-with 40% bigger viewing area through the tube.



that is funny. 30mm allows for a more robust erector that has more travel. I personally think 30mm should just be standardized it doesn't really add any weight. for your average run of the mill hunting scope 30mm offers no advantage.

the big joke is the 34mm tube scopes. in many cases they have no extra travel than a 30mm scope and when we are talking needing to shoot that far. its likely to only take a rifle from say 1700 yards to 1900 yards.

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I thought it was because bigger is better, like calibers, no?

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Originally Posted by WYcoyote
A 30mm tube is stronger than a 1" when they weigh the same?
I would think the wall thickness would be a higher value on the smaller diameter tube when the weight is equal. So increasing the diameter and decreasing the wall thickness makes a tube stronger?
And stronger meaning ability to resist flex, or what?


https://www.roguefab.com/calculator.php

This is a calculator that I found to calculate load factors on tubes with different materials. If you play around with it you'll see that if you go from a 1" tube of aluminum with a 6" span (roughly a scope) it takes almost twice the tubing wall thickness for a 1" tube to equal the same yield strength as a 1.25" tube (closest to 30mm that the table goes). For the yield strengths of the 1" tube to be equal to the 1.25" tube the weight of the 1.25" AL tube is .28 lb/ft vs. .38 lb/ft for the 1" tube. This is assuming the same yield stress for both, which means the pressure level a material can take before it starts to bend and not return to its original shape after the force is removed.

Take a 6" tube of 6061 aluminum that's 1" in diameter with a wall thickness of .120". Compare that to a 6" long 1.25" tube with a wall thickness of .095" which weighs roughly the same (3.04 vs.3.2 ozs.) and the 1.25" tube is 40% stronger.

So in other words, a 30mm aluminum tube of the same weight will be stronger than a 1" tube even though the 30mm tube will by necessity have a thinner wall thickness to maintain that weight.

Physics is funky sometimes

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