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Thread: light transmission

  1. #1

    light transmission

    Hi guys,
    A quick question, is there any difference between a 1 inch tube or a 30mm tubed scope regarding light transmission,

    Kindest regards
    Garry

  2. #2
    in theory yes, when I tried a few at a gamefair once, my old eye couldnt tell,

    I suppose at dusk?

  3. #3
    bound to be a certain amount but I doubt you could tell the difference on like for like brands with the same objective but different tubes (if you could indeed find two the same with 1" and 30mm).
    more likely to get a high end low light scope in 30mm

  4. #4
    One of the shooting magazines did a test with a light sensortive meter and could not find a differance
    AT THE AGE OF 50 I DECIDED I WAS GOING TO GROW OLD F***ING DISGRACEFULLY

  5. #5
    This is purely a guess, but from memory, as the pupil of your eye can only dilate to about 7mm (I think?) as both tube sizes are larger than that, then my wee brain tells me in practical terms we would never see the difference between the two.

  6. #6
    Quote Originally Posted by jamross65 View Post
    This is purely a guess, but from memory, as the pupil of your eye can only dilate to about 7mm (I think?) as both tube sizes are larger than that, then my wee brain tells me in practical terms we would never see the difference between the two.
    Correct.
    Not the tube size which determines exit pupil.
    S

  7. #7
    The merit of a 30 over a 25mm tube is range of adjustment in the vertical and horizontal plane. A secondary advantage is often a greater eye relief ( dist' from glass to eye) and the more eye relief you have the more tolerant it is of slight differences in cheek placement on the stock.

  8. #8
    Tube size wont make a difference.

  9. #9
    No difference.You just get more turret adjustment

  10. #10
    So I can tell the missus that girth truly doesnt matter!!!

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