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40mm vs. 50mm in Low Light

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 12:58
GunAround View Drop Down
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How much difference would I be looking at between the 40mm and 50mm in the Elite 4200 series? 

I was planning on a 2.5-10x50, but that 3-9x40 is awful tempting. 

My main concern is low light performance -- how much would I be giving up?

Also, would I be better off stepping up to the Meopta R1 or Zeiss Conquest?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 13:08
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I have a Meopta Artemis 3000 and it has better Glass than the Bushnell 4200 3-9x's that I have.  So I would have to believe the R1 is going to be even better.  Meopta has very fine glass, I have 3 of their products and are happy with all of them.  I think the Meostar will give you the best low light performance out of the 3 as it should since it is the most expensive of the bunch.
But for the money the 3-9x 4200 is tough to beat.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 13:17
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50 or 40 matters little in low light. The only difference will be the ability to use a higher magnification and still maintain the useable exit pupil. Glass and coatings are the real things to be concerned about in low light. Provided you arent in the 10x or higher low magnification variable. Then the larger objective will be necessary for low light use.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 13:32
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Optics GrassHopper
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I doubt I would take a low-light shot at much over 4-5x, usually closer to 3x.  Too much room for error at higher mag.

I guess that means no need to "upgrade" to the 3-12x56 if I go Meopta then.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 13:38
supertool73 View Drop Down
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Originally posted by GunAround GunAround wrote:


I guess that means no need to "upgrade" to the 3-12x56 if I go Meopta then.




I wouldn't.  WIth the bigger objective it will just mean you have to mount your scope higher on your gun so you cannot achieve a good cheek weld.  Which in turn tosses consistency out the door.  I personally do not own a scope that is bigger than 42mm for that very reason.  But that is just my preference.

To figure out what you need objective wise.  Just take the power you plan on using during low light and divide it by the objective size.  You said 5x max, so if you have a 40mm objective you will have 8mm of exit pupil.  Exit pupil is the size of the band of light coming out of the scope.  A persons pupil in their eye will only get as big as 7mm at night.  So at 5x you would not need anything more than a 40mm objective. 


Edited by supertool73 - July/29/2008 at 14:03
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 13:59
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I would go with the Conquest in the 3-9X40...... just mounted one on my kids 700 CDL .270 and love it.  Would have put it on mine, but I got a Kahles for it.  I have a 4200 3-9X40 as well and like the Conquest better!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 14:09
Tip69 View Drop Down
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I forgot to mention the fact that the Conquest has 4 inches of eye relief also.  I think the Meopta is less than 3" and the 4200 3 or tad more.   That extra inch is real handy and helps with scope placement as well as cheek weld.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2008 at 16:05
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Optically, I don't a whole lot of difference between the 4200 and the Conquest. Unless you plan on using magnification above 6x, the 50mm would not be necessary. I have 4 4200's and 2 B&L 4000's all in 2.5-10x40 and IMO they are still the best bang for the buck out there. The only reason I would say a Conquest 3-9x40 would be better than a 4200 3-9x40 is that the Conquest has a full 4 inches of eye relief. The rest of the Conquest line has similar eye relief to the 4200's.
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