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40mm or 50mm Objective

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Unread 06-03-2004, 03:05 PM
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Join Date: Apr 2003
Location: North Carolina
Posts: 528
Re: 40mm or 50mm Objective

Thanks 700, well done and very informative...sakofan..
It's only rock and roll....But I like it!
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Unread 06-09-2004, 06:31 AM
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Join Date: Mar 2004
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Re: 40mm or 50mm Objective

I'd take a 40mm or 42mm scope over a 50mm anyday, my main reason for this is that with a lower mounted scope it makes quicker to get your crosshair on the target, and you head is in a more comfortable shooting position (If you have an ajustable cheak piece on you stock this dosen't matter).
My 2 cents

Old aunts used to come up to me at weddings, poking me in the ribs & cackling "You're next". They stopped after I started doing the same thing to them at funerals.
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Unread 06-10-2004, 04:33 PM
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Re: 40mm or 50mm Objective


Sounds like you may be able to answer a question: What is the light gathering capability of a 30MM tube over a 1 inch tube, OBJECTIVE DIAMETER BEING EQUAL? I have read that a larger tube diameter has a much greater effect on light gathering than does objective diameter; is this true?
"Buzzards gotta eat, same as worms" - Josey Wales
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Unread 06-10-2004, 07:45 PM
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Join Date: Dec 2003
Posts: 385
Re: 40mm or 50mm Objective

No. The only advantage of a 30mm tube over a 1" tube is that the 30mm will offer more windage and elevation. But if I am not mistaken, if the 30mm tube offers true 30mm internal lenses than there is a great light transmission ability. Please correct me if I am wrong!

[ 06-11-2004: Message edited by: Jon Jackoviak ]
Jon Jackoviak
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Unread 06-10-2004, 08:45 PM
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Join Date: Feb 2004
Location: Wyoming
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Re: 40mm or 50mm Objective

I have compared the 40 mm and 50mm Leupolds side by side as the light fades. We set up a 4.5x14x40mm. a 4.5x14x50mm 1 inch and a 4.5x14x50mm w/30mm tube and found about 10 minutes of difference favoring the 50mm.

As stated before the 40mm got us to legal shooting hours but depending on conditions I suppose there might be a situation where it could be a difference in a legal situation. Dark animal or trying to distinguish horns in a group of animals.

I use the 50s on heavier rifles and (10 -11 lbs) and 40s for everything else.

One thing I really do believe is if you want a 50 get the 30mm tube with the side focus. Big improvement.
John Burns
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Unread 06-11-2004, 07:50 AM
700 700 is offline
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Join Date: Jun 2002
Location: Ireland
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Re: 40mm or 50mm Objective


What Jon Jackoviak posted is partially true in my openion.

The advantages of the 30mm over the 1 inch tubes are stronger build and more dial adjustment. Also more room for add ons like side wheel parallex and reticle illumination.

Light will travel through a 1 inch tube as efficently as a 30mm tube, so no advantage there. There may be a false perception among the shooting community that the 30mm tubes are more light efficient but this may be due to the fact that 30mm scopes are usually more expensive than 1 inch scopes, and thus may be built using better glass. This, of course, is not always the case.


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Unread 06-16-2004, 05:44 AM
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Join Date: Jan 2004
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Re: 40mm or 50mm Objective

More important that size (as I tell my wife... [img]images/icons/wink.gif[/img] ) is quality of optic and reticle design.

Thusly I would bet my proverbial that my Swaro 6x42 with no4 reticle will have a better 'real life' twilight performance than cheaper 50mm with duplex reticles.

I shoot a lot of deer a year, all with a 6x42. I reckon I could pick up maybe an extra 5 fallow if I went to an illuminated 8x56 S&B but the extra time spent in the high seat together with the extra weight and extra hassle of finding a deer in the pitch black (even with my dog) means I haven't and likely never will go down this route.
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