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Tube diamiter?

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  #1  
Unread 03-28-2012, 03:47 PM
kc kc is offline
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Tube diamiter?

Is a 30mm diamiter better than a one inch diamiter?
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  •   #2  
    Unread 03-28-2012, 03:53 PM
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    Re: Tube diamiter?

    The way I understand it, the only thing you gain from the 30mm tubes is you have more windage and elevation adjustment than you get with the 1 inch scopes. Other than that you don't gain anything else.

    Mac
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      #3  
    Unread 03-28-2012, 05:22 PM
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    Re: Tube diamiter?

    Quote:
    Originally Posted by mackgee View Post
    The way I understand it, the only thing you gain from the 30mm tubes is you have more windage and elevation adjustment than you get with the 1 inch scopes. Other than that you don't gain anything else.

    Mac
    That's the way I also understand. Light gathering is not better with the same objective size.
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      #4  
    Unread 03-28-2012, 09:33 PM
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    To get 6X zoom range, I think you need to go to 30 mm.
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      #5  
    Unread 03-29-2012, 02:11 AM
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    Re: Tube diamiter?

    Quote:
    Originally Posted by bruce_ventura View Post
    To get 6X zoom range, I think you need to go to 30 mm.
    That appears to be true, but I'd bet it's more driven by marketing than optical design necessity.
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      #6  
    Unread 03-31-2012, 12:07 AM
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    Read recently that the reason is mechanical. A 6X magnification range requires that lenses in the erector tube move further than for a 4X range. The power ring translates lenses via helical slots.

    A single rotation of the power ring on a 1" tube cannot move lenses far enough for 6X. The helix angle in the translation mechanism would be too steep, requiring excessive torque. The same rotation of the power ring on a 30 mm tube can, however.
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      #7  
    Unread 03-31-2012, 06:19 AM
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    Re: Tube diamiter?

    The terms 4X and 6X are not really proper, in this context. It would be more proper to state it in terms of power adjustability (zoom) RATIO, as in 4:1 or 6:1.
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