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50mm scope vs 40mm/42mm etc...

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  #1  
Unread 11-14-2010, 09:47 PM
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50mm scope vs 40mm/42mm etc...

What is the main reason for going with a 50mm rifle scope? Is it really worth it? Will it help you shoot better?
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    Unread 11-14-2010, 10:01 PM
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    Re: 50mm scope vs 40mm/42mm etc...

    50mm vs 42mm

    40mm, 42mm, 44mm & 50mm Objective - Optical Question of the Year

    40mm or 50mm?
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    Unread 11-14-2010, 10:14 PM
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    Re: 50mm scope vs 40mm/42mm etc...

    So basically tube diameter and glass quality are more important that objective size.
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    Unread 11-14-2010, 11:19 PM
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    Re: 50mm scope vs 40mm/42mm etc...

    The larger the objective lens, the more light a scope can let in. Mid-day a large objective lens doesn't help unless using extreme magnification, but a 50mm can give you another 20 minutes of shooting light at dawn & dusk & also helps in crappy weather, where there isn't much light to see by. Assuming the same glass quality, a 50 mm objective lens lets 56% more light through than a 40 mm lens. That's the reason people choose a 50 mm scope.

    The negatives of a large scope is easy: They are heavy & they cost more.

    Tube diameter limits range of adjustments but does little to improve visual quality.
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    Unread 11-15-2010, 10:01 AM
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    Re: 50mm scope vs 40mm/42mm etc...

    The best polish to the lens is also in the center... The larger the lens, the more probability you have of getting a lens with a nice big area with high resolution, diminishing at the edges. This will probably only mean anything to you if you are trying to get a value priced scope for a lesser used rifle...... The high dollar stuff had better come with better resolution than i can discern with my eyes.

    Resolution will also help you see later in the evening... lots of light will mean nothing if you cannot discern details.
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    Unread 11-15-2010, 10:08 AM
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    Re: 50mm scope vs 40mm/42mm etc...

    From reading around it seems that you have to have quality glass to transmit that light from the objective end to your eye. You could have a 40mm that transmits light well through the scope and a 50mm that gathers more light but doesnt transmit it to the eye well.
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    Unread 11-15-2010, 10:40 AM
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    Re: 50mm scope vs 40mm/42mm etc...

    [QUOTE=Buano;440629]The larger the objective lens, the more light a scope can let in. Mid-day a large objective lens doesn't help unless using extreme magnification, but a 50mm can give you another 20 minutes of shooting light at dawn & dusk & also helps in crappy weather, where there isn't much light to see by. Assuming the same glass quality, a 50 mm objective lens lets 56% more light through than a 40 mm lens. That's the reason people choose a 50 mm scope.


    +1

    The quality of the scope makes a large difference. A cheep 50 mm objective scope may not do
    as well as a high end 40mm retical scope.

    Also the 30mm tubes have an advantage over the 1" tubes because of larger lens internally,
    stronger tube because of diameter and a shorter overall scope length. Plus most 30 mm
    tube body scopes have a side focus feature and can have more elevation in the turrets.

    To me the best all round scope is a 4 to 6 x 14 to 20 x 50mm objective and a 30mm tube
    with side focus.

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