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To Chris (and anyone who might help me)

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2004 at 15:08
Afrikaander View Drop Down
Optics GrassHopper
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Joined: April/21/2004
Location: Argentina
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Points: 7

Hi Chris and you all

 

I am looking for the most versatile (and affordable) scope to be mounted on my Marlin 1895 (45-70) and have reduced my choices between the IOR 6x42 or the IOR 4x32 ....

 

I am leaning towards the 4x32 due to its wider field of view (9 feets more than the 6x42) and think that, since the main use I will do with this rifle/scope combo will be hunting pigs at night (which implies close shots at very low light conditions, that is moon light at most) makes me think 4x is just what I need ....

 

But the offset of this is choice is that perhaps the wider objetive of the 6x (42mm against 32mm of the 4x) would gather more light than the 4x, and seems that the glass quality of the 6x is better than the 4x (the latter says nothing of the "High resolution optic system " the 6x appears to have ... am I wright? or just being too much "teorical"? (sadly I have no chance of having a look to them both by myself - being in South, South America, so figure yourself -  that´s why i ask your opinion ... my doubt arise when thinking that perhaps the loss of light due to a higher magnification (6x compared to 4x) is highly compensated with a bigger objective and better lens quality (always talking about the IORs 4x32 and 6x42)

 

Being yourself a hunter, which would be your choice?

Looking for fast target acquisition, very low light ability, steadiness and recoil standing (shots should not be longer than 150 yards - usually half this distance) ....

 

Please even feel free to reccomend other scope not mentiooned here, if that would be your choice  (Weaver GS 4.75x40 is another favorite) ...

 

Best Regards and thank you very much in advance

 

Martin

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2004 at 15:26
Chris Farris View Drop Down
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My friend Martin...glad you discovered our forum as your questions are always very good and I feel others will benefit from your questions and comments.

 

IOR scopes are excellent low light scopes and a super value.  Of the two you have narrowed your choice down to I would say the 4x better suits your needs for several reasons.  The first is the field of view (which you noted) but the second is really important as well it has to do with the 4x32 having an 8mm exit pupil vs. the 6x42 having a 7mm exit pupil.  Both are superb in low light but the larger 8mm gives your eye more room to move around before the scope blacks out...this is very handy for close range, running targets or multiple targets and as you know hogs will present all three at once.  There is not a noticeable difference in light gathering ability between the two scopes, in other words if we had them side by side you would not be able to say which one was brighter.  I think that 6x will be too much for the inevitable close shots you will experience.  Fast target acquisition does not happen with 6x and 4x is sufficient for 150 yds and in with practice.

 

I think the ultimate would be a low powered variable....something 1-4 or 1.5-6 with an illuminated reticle.  Though it seems odd the Leupold CQ/T 1-3x14 is awesome for what you are doing.  Read more about it here.

 

A larger objective lens does not necessarily mean that the scope will be brighter. 50mm scopes are not brighter than 40mm scopes.  It is all relative to what power the scope is on.   It is easier to explain using a fixed power scope for now.   People up to around 40 can perceive a 7mm exit pupil from the scope, because that is the maximum diameter of their pupil in low light or darkness.  So ideally you would want a scope that transmits a 7mm exit pupil, the only problem is how do you know what its transmitting (its easy).  Just divide the objective lens size by the power and the answer is the exit pupil or the amount of light that is coming out of the back of the scope. ie: a 6x42 scope transmits a perfect 7mm exit pupil (that's why they make scopes and binoculars in strange numbers like 8x56, 6x42, and 9x63.  The formula is a little different for a variable scope, you would take the objective lens size and divide it by 7 to determine what power to put your scope on for a 7mm exit pupil (the most your eye can handle). ie: a 3-10x40 would need to be set on 5.7x to produce the desired 7mm exit pupil. A 3.5-10x50 would need to be set on about 7.1x to get a 7mm exit pupil. You see, these two scopes 40mm and 50mm are just as bright, they just do it on different powers.  A larger objective allows you to use your scope on a higher power and still have perfect light gathering.  A 3-12x56 transmits perfect light on 8x.  A 1.5-5x20 does it on 2.9x.  First decide what power you need for what you are doing, then multiply that by 7 and the answer will be the size of objective lens you will need.

All of these formulas for producing the same light with different powered scopes are only relevant if you are comparing scopes from the same manufacturer and the same models.  ie:  Weaver Grand Slam.  You can't get a BSA 3-9x50 and set it on 7x and expect it to be just as bright as a Leupold 3-9x50, because it is the glass and coatings that primarily determine the scopes ability to transmit light to your eye efficiently.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2004 at 15:45
Afrikaander View Drop Down
Optics GrassHopper
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Joined: April/21/2004
Location: Argentina
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Points: 7

Thank you very much Chris !!

 

As usual, your answers cover all doubts (posted and still unposted !)

 

It always amaze me the level of knowledge you share, in a very kind and understandable way ....

 

Perhaps many people can tell "what" about something, but not too many can tell "why" and  "how" just as you do, and that´s  why I appreciate and highly respect your opinion  

 

I am planning a trip to the States in a couple of months, will contact you then so as to purchase this scope (and the corresponding mount), and bring it by myself (Freight and Customs are VERY expensive  !)

 

Once again, thank you very much !

 

Martin

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