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first focal plane and second

 
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  #1  
Old 04-07-2009, 07:14 PM
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Location: Albuquerque, New Mexico
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first focal plane and second

ok new to this site but not that new to shooting.

Correct me if i'm wrong but with a FFP the reticle does not move with magnification, thus point of aim point of impact bam. On a SFP if you increase the mag your point of aim point of impact should move correct? if so then how much?

Application is hunting 300-600 using a NF NXS 3.5-15x56 NPR-1
Going to use 6.5 grendel AWS 24" barrel 120gr Nosler BT

any light shed on the FFP and SFP movement of the reticle would be much appreciated
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  #2  
Old 04-07-2009, 07:40 PM
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Re: first focal plane and second

For your 3.5-15 NPR1 : assuming that the lines on the reticle are 1moa:

With the FFP reticle the values of the reticle lines remain the same at any power, since the size of the reticle changes with magnification. So no matter what power you have on your NPR1 each line is 1moa.

If you have a SFP then the reticle size does not change with magnificaton, only the target size changes . For this reason, the lines on the reticle are only 1 moa at 15x and would be 2 moa at 7.5x. The value of the lines are inversely proportional to the power on the 2nd FP scopes.

Last edited by RockZ; 04-08-2009 at 09:11 AM.
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  #3  
Old 04-07-2009, 10:37 PM
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Re: first focal plane and second

FFP scope the reticle and picture gets larger on higher magnification and they get smaller on lower power. Not the best setup for very accurate shots. Great for sniper tactical shooting matches where you do a lot of ranging, magnification changes and holdovers. They are faster and require a few less steps in math calculations.

SFP scopes the reticle stays the same no matter what power you are on. POI doesn't change with magnification changes on quality scopes, only on cheap scopes. Great for paper punching and hunting. If you know your equipment well they can be just as fast as a FFP scope in tactical shooting matches.


GC
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  #4  
Old 04-08-2009, 07:15 AM
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Re: first focal plane and second

First off the point of aim and point of impact should not change with either a FFP or a SFP scope as the power is changed.

I dissagree with the comment that a FFP scope is not good for presicse shooting at long range, as I have both styles ( S&B and Nightforce) and I have no problems with either at very long range. The Reticule substions are calibrated on all powers with a FFP scope, but are only calibrated at one power in a SFP scope. Either one will serve you well.
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Old 04-08-2009, 07:48 AM
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Re: first focal plane and second

FFP scopes some reticles get so small @ lower power that they can be lost in the background. Also the reticle gets larger on higher magnification and can cover a small target making it harder for a precise shots.

This is the very reason why many prefer thinner finer reticles on a SFP scopes for long range shooting.

There are draw backs to both FFP and SFP scopes but I prefer the later for the reasons I mentioned.

Here is Falcon Menace 4-14x44mm FFP Tactical Rifle Scope on 14X. You can imagine how large it would be on higher power @ longer ranges on a small target.




Here is the same reticle on 4X







GC
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  #6  
Old 04-08-2009, 08:12 AM
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Re: first focal plane and second

Perhaps you have never looked through a S&B with a P-4 fine reticule, it is not to thick at high power and yes it does get small at low power I have no problem seeing the intersection even with my 58 years old eyes. Blanket statements are rarely accurate across the board
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Last edited by jwp475; 04-08-2009 at 08:16 AM.
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  #7  
Old 04-08-2009, 08:23 AM
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Re: first focal plane and second

You can use your drop chart/hold overs on any power with a ffp. You can not do this with sfp. I doubt that you will use the scope on it's lowest power at long range, but if you do, the sfp scope will probably cover the target with the reticle so you can't tell where you are aiming unless you run the power up to make the target larger in proportion to the reticle. The ffp reticle will stay the same relative size on the target at every power.

Jmo, the ffp is much more usable in every situation. There is a reason it costs more and people who know, buy them.

Steve
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