Magnification help

Obsessed

Well-Known Member
Joined
Nov 21, 2002
Messages
56
I have a Leupold 8.5-25X50 LRTM1, a 6.5-20X50 LRTM1 and just picked up a 4.5-14X50 LRTM1. I have the opportunity to trade the 4.5-14 in on another 8.5-25X50 LRTM1 and am seriously considering doing so, but first I would like to know what you guys think about keeping the 4.5-14X50 for shooting out to 1000yds? Will the lower magnification work, or is it less than ideal? I see threads where guys are using 3.5-10X50's for LR work, but it seems that the higher magnification scopes are the norm for most LR shooters. Opinions please!!
 

DMCI

Well-Known Member
Joined
Oct 28, 2003
Messages
120
Location
Washington State
There are a couple issues here.

1. Resolution

Your basic Mark1 Eyeball when it is young and fresh will resolve about 1 inch at 100 yards. So if you wish to maintain this and the quality of the optics is perfect, (basically not the case.) then you would need 1 power for each 100 yards. So 5x at 500 yards, 7 at 700, etc. until you got to 10x at 1000 yards. If the target is large like an Elk, this relationship would work fine.

If the target is small, like a varmint or coyote, then more power is desirable. If you have a 15 power scope at 700 yards you should be able to resolve .5 moa or 3.5 inches, or at 300, say 1.5 inches.

To test the resolution of your eye sight put a bottle cap on a post and walk away from it and see how far away you can see it. Kids generally have no problem seeing it at 100 yards. Adults tend to have less ability.

The ability to see colors is important as well. If the bottle cap is blue and the post is brown, you will not see the bottle cap as well as if it had been white against this dark background. Color discrimination is very important in hunting where game animals and varmints tend to wear great camouflage suits.


In my opinion, this issue of resolution is the difference between inexpensive optics and their more expensive brothers.

2. Mirage

Heat waves rise. These rising heat wave may result in bending of light and distortion of the target. The effect becomes more pronounced as the power is increased. For this reason on days when this mirage is present, you may be limited to 10x to 12x to minimize apparent blur of the target.

More expensive optics can with their higher resolution minimize or reduce this effect. Recently, for these reasons I have tended to buy better optics.

You can test these features best by putting two scopes on the target and see which scope appears clearer. What you are really measuring is resolution.

You will note as is my normal practice, I have not mentioned any brands. Rather, I suggest you go to the store and compare several different scopes by looking at a distant object such as a street sign. A good scope should easily read lettering on street name sign at 300 yards.

D.


[ 12-24-2003: Message edited by: DMCI ]
 

Brent

Well-Known Member
Joined
Jun 12, 2001
Messages
2,537
Location
Palmer, Alaska
I very rarely com off 22x while shooting LR, animals or targets. 22x on targets is far superior to 14x, 10x is even worse for consistant POA. Either way, 14x is fine for 1000 yards on Elk size critters, maybe even deer. I'd still like the higher power and could always go down to that if I had to though, so???? This 5.5-22x is as low as I'll ever go again.

My 416wby with the VXIII 3.5-10x is ok to 700 yards, but the kill zone size steel plate's getting **** small at that.

Resolving movement in POA is what it comes down to for me. I'd trade up in a heartbeat.
 

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