Why NOT use a compact scope on all guns?

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Futo Inu

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Back up a sec - what's NOT to like about, for example, a Burris "Compact" scope? Less cost (significantly), lighter, better balancing of rifle (potentially), less to get in the way and get banged up.

Why would anyone use a longer, heavier, more expensive scope on a rifle? :confused: Hell, I would think it could also improve light transmission (just less distance for the light to go through), AND less likely to get bumped off zero or be bent, due to the shorter, more compact/robust proportions of construction. The only thing I can think of is that perhaps the adjustable range is not as much, and also slightly smaller objective say 32mm instead of 40 for comparable scope, but this too can be an advantage - get that thing on low rings! :scrutiny:

I'm comparing the Burris Signature with the Burris compacts - perhaps I'm erroneously assuming that the compacts are on a par with the Signatures, but it seems like they are, near as I can tell - I don't think Burris is going to offer any crap scope. I suppose they might be more in line with Burris Fullfields instead, the "economy" Burris line - they don't come out and say - perhaps there's some real hidden values here. When compared to the Fullfield II, the prices of the compacts don't compare quite as favorably, but still better in some magnifications and about the same in others, price-wise.

Same deal with Leupold - their 3 compacts are simply called "Vari-X" - doesn't say whether they're comparable to Vari-X IIIs or not. Their 2 "muzzleloader/largebore rifle/crossbow" scopes say they are VX-IIs, but doesn't say on the other 3 compacts.

I've been scrutinizing the websites of Burris and Leupold, and it's perplexing, but if the Burris compacts compare to the Signature line, they're incredible values; good to great values compared to the Fullfield IIs. If the Leupolds compare to the Vari-X IIIs they're great values; compared to the VX-IIs, however, not so much...

But why else would these companies purposely not tell you which other lines they compare to in terms of construction, optic coatings, and features, unless they just don't want to undercut themselves by letting the cat out of the bag? (but yet they still feel that they can't charge as much for a "compact" scope even though there's a small but steady market for them). Or, OTOH, maybe they're relatively poor in value, since they only compare with the economy lines, and therefore they don't want you to know that fact. :scrutiny:

In fact, Burris's website says: "Some other brands relegate compacts to lesser quality. One look through a Burris compact and you'll realize these are serious scopes.", for what that's worth...
 
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To address part of the post.

Amount of light transmission is dependent on...
Quality of optical construction
Size of objective lens.

Power , magnification , will also effect the brightness.
More power, less light.


Sam
 
The key is the ability to position the scope for your own eye relief. Due to the shorter sections of tube between the bells at either end and the turret in the middle, there's less room for adjustment, especially on long and magnum length actions. If you have a short length of pull on the stock you may not be able to push the scope far enough forward, and conversely on a long stock the scope may not be able to slide far enough backwards.
 
Then there is field of view - the Burris 6X Compact is listed at 17ft @ 100 yards , the 6X HBR only 13 ft as compard to the 6X Fullfield/FullfieldII 23ft @ 100 yards. The 6X Signature is listed at 20 ft @ 100 yards.
 
Light transmission is highly dependant on the exit pupil size, which can be calculated by dividing the diameter of the objective by the magnification. So, a 10x with a 42mm objective has a 4.2mm exit pupil. For optimal brightness, you want an the size of the exit pupil to match up with your pupil - anything larger than that, and it is essentially "wasted" light. I believe in normal daylight conditions, the average pupil size for an adult in their 20's is around 6-7mm. As you get older, this gets smaller.

So... a compact scope with high magnification won't be as bright as a larger scope of the same magnification and similar quality. For most applications, it probably won't make much of a difference, but for lower light shooting, it could...

Rocko
 
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