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Question of first focal plane

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/11/2009 at 22:43
Sandhillbilly View Drop Down
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 I have a Falcon ffp scope, 4x14. I am not here to promote or make a review of this scope.
     I have to be over 6 power in order to mil a target. The retical is to small to mil at a lower power. I understand the retical has to be small at a low power because it magnafies with the target. Question---  Is this common with ffp scopes?  I am looking at a variable IOR in ffp. Will it have the same problem?
 
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 12:00
donlipa View Drop Down
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I don't know but I will give you a free bump because it is an interesting question.  I would think depending on the range value yes this would be an issue with all FFP scopes.  If you want a useable reticle at the high end the dots will be way close together at the low end.  That being said I have never used a FFP scope so I will leave it to the professionals.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 12:47
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Yes it will.  I have an IOR 2.5-10x and a 3-18x both in FFP and both of them are the same way.  I cannot range until I around 6x
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 12:53
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Originally posted by Sandhillbilly Sandhillbilly wrote:

 I have a Falcon ffp scope, 4x14. I am not here to promote or make a review of this scope.
     I have to be over 6 power in order to mil a target. The retical is to small to mil at a lower power. I understand the retical has to be small at a low power because it magnafies with the target. Question---  Is this common with ffp scopes?  I am looking at a variable IOR in ffp. Will it have the same problem?
 
          Thanks
 
Yes, this is common.  With a FFP scope, the reticle is on the same focal plane as the target image, so as power changes, the reticle size always remains in the same proportion as the target.  At low power, the reticle is correspondingly small since it subtends the same amount of the target at the lower magnification.  Whether or not you will have the same problem with being able to mil at lower power depends to a great deal on the design of the reticle itself, i.e. how thick the lines and how prominent the mil dots are.  To a certain degree, the same problem will still exist because it will be harder to gap between the mil dot spacing.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 12:55
Rancid Coolaid View Drop Down
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Yep, that is the nature of FFP.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 13:07
Sandhillbilly View Drop Down
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Thank you for your replies. I figured that was the case. I am guessing light transmission, quality of optics, and the users eyesight could make a small difference. I really like the first focal plane in a mil retical scope. Is there any advantage in a non range finding retical scope?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 13:43
Rancid Coolaid View Drop Down
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The reticle in a FFP always covers the same amount of target.  With an SFP reticle, the amount of target covered increases as the magnification decreases (inverse proportion) while with FFP, it remains constant.

FFP is good for ranging and a few other specific scenarios.  As a general rule, if you are not sure you need FFP, you don't need FFP.

SFP is best for hunting (in my opinion) as you never lose the reticle due to change in magnification.


Edited by Rancid Coolaid - February/12/2009 at 13:43
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 13:46
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The thing is there's no reason you'd ever want to 'Mil' something at 6X.  For actually ranging something you always want to use the highest power as it will give the best accuracy. 

Using the lines/dots for holdoffs is another thing though.  The lines on the IOR FFPs are thicker than the Falcon's; I could see mine all the way down to 3X, though they are getting pretty small at that point.  Usually when you have the scope on 3-4X it will be for close range targets and you'll just use the reticle as a duplex--no need to range or hold over/under, off for wind, etc at close range.  Point and shoot.

If you like to set the scope at 6X or so for general use, that works fine and the hashes are very usable for holdoffs.  But again, if you actually need to range something crank up the power (or push the button on your rangefinder  Wink ).
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 14:40
John Barsness View Drop Down
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Sandhillbilly.
 
There are two advantages of a FFP scope even if you're not using a ranging reticle:
 
1) The reticle CANNOT change point of impact on a variable scope. This isn't much of a problem anymore on SFP variables anyway, but....
 
2) The reticle itself is still very visible in dim light even on high magnification. This is why hunters who shoot at night often prefer FFP scopes.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/12/2009 at 16:06
Sandhillbilly View Drop Down
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Thanks for your imput, highly appreciated.
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