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40mm vs. 50mm

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Old 08-24-2002, 06:59 PM
Posts: n/a
Re: 40mm vs. 50mm

Let us not forget field of view at extreme ranges, which a smaller obj will have a smaller FOV. When shooting extreme long range I would expect to see as large of an Obj lens as you could get proportional to the rifle of course.
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Old 08-24-2002, 08:00 PM
Bronze Member
Join Date: Sep 2001
Location: San Jose, CA
Posts: 66
Re: 40mm vs. 50mm


The Cat Killer is right in his post, your quibble with the term "light gathering" notwithstanding. There is nothing scientific about the term "light gathering"; everyone understands that the larger the objective, the more light is available to illuminate the object of interest. This concept isn't debatable and is not particularly interesting.

Nor is it debatable what was posted about "exit pupil." "Exit pupil" is simply a ratio, the mathematical result of dividing the objective diameter by the power - so as the power is increased, the exit pupil is proportionately reduced. Your comment that "You can stack them [i.e., the various lenses] up in any size, order or distance "see scope length" to achieve whatever pupil size you want" is simply wrong if you mean to imply that "exit pupil" is a function of anything other than objective size and power.

While it is true that good glass and coatings enhance the total amount of light that is transmitted, the size of the objective also effects the amount of light that can enter the scope. In any scope for serious work, one always wants to minimize the light loss; but one may not always want or need the largest objective possible - it very much depends upon the application.

Read Catshooter's post again. It contains a lot of good information.
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Old 08-24-2002, 08:33 PM
Gold Member
Join Date: May 2001
Posts: 920
Re: 40mm vs. 50mm

Thank you, Blaine...

You are a scholar and a gentleman... well, a scholar anyway [img]images/icons/wink.gif[/img] [img]images/icons/wink.gif[/img]

Here, kitty kitty kitty.

LRH member #23
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Old 08-24-2002, 08:39 PM
Bronze Member
Join Date: Sep 2001
Location: San Jose, CA
Posts: 66
Re: 40mm vs. 50mm


I'm not sure that anyone actually answered your question.

One consideration in evaluating the size of the objective is how you will shooting your rifle. As you have indicated, if you decide on a large objective, you will of necessity have to use higher rings. If your shooting consists of shooting off a bench, this should present little difficulty. But if you intend to shoot prone, you may find that high rings will not allow a proper cheek weld. I know that for me, my comb-eye distance is subtantially reduced in prone requiring me to elevate the comb of the rifle to obtain a proper eye/scope relationship. So, from the bench high rings may work fine for me; but when I try prone, I have to raise my head to the point that sometimes I will not have any head contact with the rifle at all. Not good. Therefore, I have found that in order for me to shoot prone, it is necessary that I use short rings - and that means that a 50mm objective is out of the question.

To accommodate my particular needs, I have settled on a USO scope with a 44mm objective. The glass is of good quality, coatings are first rate and enough light is admitted to shot well after sunset. Therefore, the 44mm objective is both practical and adequate for my use.

You may have other demands that require a larger objective. If so, your scope will necessarily be a little higher. Make sure that this added elevation is compatible with the positions in which you intend to use your rifle.
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Old 08-24-2002, 09:54 PM
Junior Member
Join Date: Mar 2002
Posts: 15
Re: 40mm vs. 50mm

Thanks for the info. The gun will be used mainly for hunting deer sized game. In my area we can legally hunt from a 1/2 hour before sunrise to a 1/2 hour after sunset. I'll be using the gun standing, kneeling, sitting, and prone.
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Old 08-25-2002, 10:54 AM
Gold Member
Join Date: Sep 2001
Location: North, Texas
Posts: 610
Re: 40mm vs. 50mm

Read all the comments on this topic now I curious about the larger objectives like the USO 80mm. Is that considered overkill or what?

Is bigger really the best way to for wide open spaces or competition shooting? The 80mm seems kinda weird but there must be a place for this type of scope right?
Where is it?
Courage,Spirit and Honor
Pass It On
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Old 08-25-2002, 08:59 PM
Junior Member
Join Date: Jul 2002
Location: Alaska
Posts: 4
Re: 40mm vs. 50mm

Kudo's Varmit Hunter.

Texas- "IMO" The Bigger The Better with the good stuff.
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