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RH
Mount your rifle with the scope at 3x and move your head backwards - do you still see the black around the image?
Large objective scopes tend to have more restrictive eyeboxes than smaller objectives. I have a 2.5-10x56 Trijicon that is similar. With the scope mounted to be in the middle of the eyebox at 10x, turn the magnification down to 2.5x and it displays tunnel vision, because the eyebox has moved rearward with the magnification change. Pull your head back and you can get a full image in the tube again.
It is possible to mount the scope where you are at the back of the eyebox for 10x and the front of the eyebox at 2.5x, maintaining a full field of view for each. Eye position then becomes critical for both magnifications and changing clothing/field positions can make it difficult to get behind the scope quickly. I chose to leave it set up optimally for 10x as the scope is almost never at 2.5x.
If this is the problem you are experiencing it is due to the 56mm obj, not the scope quality.
David I appreciate the help honestly, but you evidently just don't understand what we are talking about. It has nothing to do with eye position or proper eye relief. That thick black ring doesn't go away because you get your eye positioned correctly. It's just part of the scope design. Some scopes show a thicker black than others. I understand what you are saying and know perfectly well that part of your sight picture won't appear correctly without proper eye relief and position. I've been hunting and using scopes for nearly 40 years. It's ok if you have never noticed the tunnel vision effect. I would have to show you two scopes, one with and one without, and point it out for you to understand what we are talking about.
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R H,
Interesting discussion. Made me start doing some more digging. After looking around I realized that I have one of the scopes that is supposed to display this property in my gun safe. Pulled out my new SWFA SS 3-9x42 that I received a few days ago, turned out down to 3x - Tunnel Vision! Goes away about 4x.
Now I see....
David
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Campfire 'Bwana
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It's sort of like when a happy Sony Trinitron user was shown the two wires across their computer screen. Now you won't be able to avoid seeing it. 
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It's sort of like when a happy Sony Trinitron user was shown the two wires across their computer screen. Now you won't be able to avoid seeing it. Thanks  ! David
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It's sort of like when a happy Sony Trinitron user was shown the two wires across their computer screen. Now you won't be able to avoid seeing it. Exactly! I never noticed it 10 years ago, now I can't stand it compared to one that has a nice view with only the thinnest ring of scope tube showing. David I may have to go back to that shop and look at the 3-12X56 at a higher setting. I just didn't bother that day because I use the lower settings the most when hunting around here.
Last edited by R_H_Clark; 05/25/14.
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R H,
Interesting discussion. Made me start doing some more digging. After looking around I realized that I have one of the scopes that is supposed to display this property in my gun safe. Pulled out my new SWFA SS 3-9x42 that I received a few days ago, turned out down to 3x - Tunnel Vision! Goes away about 4x.
Now I see....
David
Except that on a bunch of scopes, the tunnel vision doesn't go away....
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R H,
Interesting discussion. Made me start doing some more digging. After looking around I realized that I have one of the scopes that is supposed to display this property in my gun safe. Pulled out my new SWFA SS 3-9x42 that I received a few days ago, turned out down to 3x - Tunnel Vision! Goes away about 4x.
Now I see....
David
Except that on a bunch of scopes, the tunnel vision doesn't go away.... Tell me more.... David
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The lack of tunnel vision and great eye box is why I've come to like Leupolds so much. I do wish they had a bit better glass sometimes, though they are perfectly fine for hunting they sometimes lack the contrast of higher end optics.
It seems everything is a trade off in some manner, which is why I was interested in what higher end optics lack tunnel effect.
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Campfire Ranger
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Conquests suck for tunnel vision. Their owners just don't seem to want to admit it.
Leupold is far better edge to edge....
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Campfire Ranger
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I looked thru a Leupold VX3 3.5-10 x 40 whatever at Bass Pro on Saturday set at 3.5X. I am always surprised at how much darker things look through these scopes when they are inside a building. Not saying its a bad scope just that things look darker through them than it seems through other scopes I own.
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I swore to not ever discuss the intangibles of optics any more, and here I am IMO Leupold portrays a "flatter image" and better color rendition than a Conquest does. The Conquest portrays a "glossier" image IMO. Some say the Conquest is brighter due to this glossy image, but during low light hours it is basically a wash IME. Either are very good and will get you past legal shooting hours with aplomb. I like Conquest glass just fine. But I don't like the black donut effect they portray, or their heavy weight, or their turrets......
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The absolute least tunnel vision effect I have ever seen came with a Vixen series VIII 1-6x24. There is nothing but a fine point sharpie sort of line between the magnified view in the scope and the non-magnified view outside the ocular housing. You almost have to look for the demarcation line to even see it. Sharp edge to edge too. It's a $1,200 scope so it should have been good I guess.
The tunnel vision effect comes from the addition of a wider field stop to reduce blurring at the edge of the fov. Cheaper to do that than redesign for a fov with less curvature of the field.
Steve
Theodore Roosevelt: "Do what you can where you are with what you have"
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The Vortex Viper 2-7 has the worst tunnel vision I have encountered. Nice optics, but big black donut around it.
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The absolute least tunnel vision effect I have ever seen came with a Vixen series VIII 1-6x24. There is nothing but a fine point sharpie sort of line between the magnified view in the scope and the non-magnified view outside the ocular housing. You almost have to look for the demarcation line to even see it. Sharp edge to edge too. It's a $1,200 scope so it should have been good I guess.
The tunnel vision effect comes from the addition of a wider field stop to reduce blurring at the edge of the fov. Cheaper to do that than redesign for a fov with less curvature of the field. Appreciate the input. I've never heard of a Vixen. I'm going to google them now.
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Campfire Ranger
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John Barnes test's scopes and publishes in rifles and recipes. IIRC the Conquest did a bit better than a VX3 of about the same size regards low light performance. The reticle makes a huge difference in my opinion a #4 is the way to go for shooting in near dark conditions.
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The scopes with the most tunnel vision I have looked through are Nightforce. Definitely they are the tunnel vision champs. I think it looks like about 3/16" of black around the ocular.
"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Ringman, that Conquest 3-12X56 on 3X had 3/16 beat by a good bit.
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