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Objective size: small vs. large

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2008 at 23:06
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I am intrigued by the Zeiss conquest 4X32 and will probably be buying one this summer. My concern is what my field of view will look like. Would it be the same as a 40 mm. Conquest set to 4 power? Is anything else determined by objective size other than light transmission?  Thanks, Bricat
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 00:24
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Bricat,
 
I don't think the difference is appreciable.  SWFA shows that the Nikon Monarch UCC 4x40 has a field of view of 26.9 ft, while the Zeiss Conquest is listed as having a 26.1 ft FOV.
See the here the listings: 
 
 
FOV can be effected by the length of the scope.  The shorter the scope, the larger the FOV (generally).  That's why scout scopes generally have crappy FOV - the objective is furthe away from your eye.  I'd also make a friendly note that all objective size does is measure "potential" light transmission.  Coatings + objective diameter + quality of glass are the true measure of light transmission at the surface of the glass. 
 
You should check out the IOR, if FOV is important to you.  It's FOV is listed at 29ft.  Assuming all other things are equal (coatings, size of objective glass, etc.), the reason you get the extra 2 feet is because the IOR a shorter body. 10.75" (IOR) vs. 12.2" (Conquest)
 
Hope this helps.
 
Deck
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 11:15
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Originally posted by bricat bricat wrote:

I am intrigued by the Zeiss conquest 4X32 and will probably be buying one this summer. My concern is what my field of view will look like. Would it be the same as a 40 mm. Conquest set to 4 power? Is anything else determined by objective size other than light transmission?  Thanks, Bricat
 
Bricat, I have one of these scopes, and I can tell you it's a wonderful little scope in all respects!  FOV is 26 ft @ 100 yds, which is pretty much equivalent to most variable scopes set at 4X, give or take a yard or two.  FOV is influenced by the ocular design and focal length, not by objective size per se.  However, a larger diameter objective usually comes with longer focal length, which means narrower FOV.  All else being equal, a larger diameter objective increases light transmission and improves resolution somewhat.  However, on a fixed 4X scope, you wouldn't gain anything by increasing objective diameter anyway, since a 32mm objective provides an 8mm exit pupil at 4X.  So, the scope is in no way limited by the 32mm objective, and in fact, I think the compactness of this little scope is one of its strengths.


Edited by RifleDude - April/21/2008 at 11:18
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 18:23
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 does a 30mm tube automatically give you a larger field of view if all else is equal?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 18:40
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Originally posted by dougedwards dougedwards wrote:

 does a 30mm tube automatically give you a larger field of view if all else is equal?
 
Not neccessarily. Most ,but not all, 300mm tube scopes have the same internals as 1" scopes. You do get extra windage and elevation though.
Derek
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 20:00
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Originally posted by dougedwards dougedwards wrote:

 does a 30mm tube automatically give you a larger field of view if all else is equal?
 
No, the tube diameter has no direct effect on FOV, light transmission, etc. as commonly believed.  It MAY provide greater adjustment range (though some high end 30mm European scopes actually have LESS W/E adjustment range), and MAY permit the use of larger erector assy lenses, which can improve resolution slightly.  Mostly, the 30mm tube is just the European standard tube diameter because they use the metric system whereas in the U.S. we still use both the imperial system (hence 1" tubes) and the metric system.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 21:06
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That is interesting.  It seems that most of the really expensive and highly rated scopes are of 30mm tubes.  Is this only because the Europeans make better glass?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2008 at 22:38
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Originally posted by dougedwards dougedwards wrote:

That is interesting.  It seems that most of the really expensive and highly rated scopes are of 30mm tubes.  Is this only because the Europeans make better glass?
 
By and large, the German and Austrian glass is indeed better than just about anything, but not in direct proportion to the cost (some of the additional cost has nothing to do with higher quality), and the really good Japanese glass is catching up and in some cases, equalling the Euro glass.  This doesn't mean that the same level of quality can't be made elsewhere, but companies are only responding to market demand and the companies who don't already have a reputation for the truly premium optics would have a much harder time selling their product at the same price point as the well established premium Euro brands.  It also has nothing to do with the 30mm tube itself, it just so happens that the top end Euro scopes have the 30mm tube because the European countries use metric dimensions almost exclusively.
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