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6.5-20x50 wide angle WTC


andrew f
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If he's not using a 30mm tube he might want to try one as they usually let more light in? That's my understanding anyhow

 

 

Your understanding's wrong I'm afraid.

 

Light in is dependant upon the objective diameter not the tube size. The popularity of larger (30 and 34mm) tube sizes is more to do with the extra amount of windage and elevation you get which is important for longer range shooting.

 

A doubling of objective diameter quadruples the amount of light gathering.

 

Larger tubes = mainly a chance for marketing types to charge more money and offer more adjustments. For true long range use, moa rails which kick the rear of the scope up are used.

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Your understanding's wrong I'm afraid.

 

Light in is dependant upon the objective diameter not the tube size. The popularity of larger (30 and 34mm) tube sizes is more to do with the extra amount of windage and elevation you get which is important for longer range shooting.

 

A doubling of objective diameter quadruples the amount of light gathering.

 

Larger tubes = mainly a chance for marketing types to charge more money and offer more adjustments. For true long range use, moa rails which kick the rear of the scope up are used.

What he said

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Your understanding's wrong I'm afraid.

 

Light in is dependant upon the objective diameter not the tube size. The popularity of larger (30 and 34mm) tube sizes is more to do with the extra amount of windage and elevation you get which is important for longer range shooting.

 

A doubling of objective diameter quadruples the amount of light gathering.

 

Larger tubes = mainly a chance for marketing types to charge more money and offer more adjustments. For true long range use, moa rails which kick the rear of the scope up are used.

I understand what you are saying however would a bigger tube not let more light through? Again, if I'm wrong fair enough, always up for learning something new :)

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It doesn't. I can see why people think it might but when looking at Twighlight factor or brightness, what matters is objective diameter, ocular diameter and magnification. Tube size doesn't come into it as the light is focussed by the lens elements at the objective to the ocular lens group and from there back to your eye. You will see minimal difference in brightness between two similarly constructed scopes using the same objective and ocular lenses. The main tube houses the erector tubes for windage and elevation and with a larger main tube, you have more increments for adjustment...generally not needed for most UK hinting scenarios but we all like to think that bigger is better! For people who gong shoot over private land to say 600 plus yds, a 30mm tube makes more sense than a 25mm tube but light gathering for the same lens groups wont be any different.

Edited by Savhmr
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