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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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OP
Campfire Tracker
Joined: Mar 2004
Posts: 7,126 |
I get confused sometimes reading that 30 mm scopes can't be any brighter than 1" scopes, and the same with 42mm vs 50 mm?
So, if scope specifications lists a 3-9x50 30mm scope having an exit pupil of 5.7, and a 3-9x42 1" scope having an exit pupil of 4.4, then the larger scope lets in more light, right?
Thanks,
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Joined: Jun 2004
Posts: 44,825
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,825 |
It doesn't have anything to do with the tube.
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 17,527 |
Difference between 1" and 30mm has to do with adjustment travel.
And, it has been debated on here since the beginning of the internet, but I personally think a larger objective is indeed brighter when comparing similar optics.
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Joined: Jan 2006
Posts: 18,453
Campfire Ranger
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Campfire Ranger
Joined: Jan 2006
Posts: 18,453 |
The reason that the first scope you mention will be brighter is because it sports a 50mm objective lens and the other a 42mm. If all else is equal when comparing two scopes (glass quality, lense coatings, internal design, flare control etc.) then the tube size is irrelevant.
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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OP
Campfire Tracker
Joined: Mar 2004
Posts: 7,126 |
OK, so it is only the objective lens size contributing to a larger exit pupil number?
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Joined: Jun 2004
Posts: 44,825
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,825 |
Divide lens diameter by magnification and that's exit pupil.
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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OP
Campfire Tracker
Joined: Mar 2004
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Thanks guys, I finally get it.
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Joined: Jan 2006
Posts: 18,453
Campfire Ranger
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Campfire Ranger
Joined: Jan 2006
Posts: 18,453 |
Yes. Take a 6x42 Leupold scope for example and do as mathman suggested and you come up with a 7mm exit pupil. If Leupold built that scope on a 30mm tube or the offered 1" tube, it would make no difference with regards to brightness.
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Joined: Nov 2003
Posts: 28,854
Campfire Ranger
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Campfire Ranger
Joined: Nov 2003
Posts: 28,854 |
OK, so it is only the objective lens size contributing to a larger exit pupil number? In modern optics you will discover with side by side comparisons exit pupil is irrelevant. If you want examples I will post them.
"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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OP
Campfire Tracker
Joined: Mar 2004
Posts: 7,126 |
I can understand it being irrelevant comparing different qualities across different brands. But, are you saying of the same or similiar models?
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Joined: Jan 2006
Posts: 18,453
Campfire Ranger
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Campfire Ranger
Joined: Jan 2006
Posts: 18,453 |
Please don't encourage him.
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Joined: Dec 2010
Posts: 6,148
Campfire Tracker
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Campfire Tracker
Joined: Dec 2010
Posts: 6,148 |
Is it possible to put an entire thread on ignore?
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Joined: Jan 2006
Posts: 18,453
Campfire Ranger
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Campfire Ranger
Joined: Jan 2006
Posts: 18,453 |
I don't think so but I have a feeling this one's going no where.
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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OP
Campfire Tracker
Joined: Mar 2004
Posts: 7,126 |
Is it possible to put an entire thread on ignore? Well my question is answered so I'm done. Bye.
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Joined: Jun 2003
Posts: 42,614
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2003
Posts: 42,614 |
I didn't think anybody could be this "short"
A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”
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Joined: Nov 2003
Posts: 28,854
Campfire Ranger
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Campfire Ranger
Joined: Nov 2003
Posts: 28,854 |
I can understand it being irrelevant comparing different qualities across different brands. But, are you saying of the same or similiar models? Pretty much, yes. You will see folks who have not done the side by side use ignorant prejudice to argue against facts, but fact are facts.
"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Joined: Feb 2002
Posts: 13,650
Campfire Outfitter
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Campfire Outfitter
Joined: Feb 2002
Posts: 13,650 |
I can understand it being irrelevant comparing different qualities across different brands. But, are you saying of the same or similiar models? Pretty much, yes. You will see folks who have not done the side by side use ignorant prejudice to argue against facts, but fact are facts. Objective comparisons are not facts...
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Joined: Feb 2009
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Campfire Tracker
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Campfire Tracker
Joined: Feb 2009
Posts: 6,766 |
despite Ringies 'comparisons', exit pupils do rate a thought. one of the downsides of too much magnification is tiny exit pupils.
Guns don't kill people, drivers with cell phones kill people.
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Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2009
Posts: 10,102 |
Can Windex gather more light if used on the lens?
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Joined: Jun 2006
Posts: 46,030
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2006
Posts: 46,030 |
Only diamond-coated Windex can.
A wise man is frequently humbled.
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