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Magnification and Subtension |
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338LM
Optics GrassHopper Joined: April/26/2013 Location: LA Status: Offline Points: 27 |
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Posted: May/18/2015 at 19:34 |
Hi Everyone, 1st of all, I am very sorry for the stupid question I am about to ask. 2nd My question. Since the reticle size changes base on the magnification of the first focal plane scopes, does magnification and subtension matters at all? Example: SWFA SS 3-15x42 FFP scope zero at 100 yard, target at 300 yards, scope zoom in at 10x. Does that means my actual subtension of 1 MRAD reticle space are now 2 MRADS? OR Reticle Space are still 1 MRAD? Thank You JC
2 a 26" |
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Son of Ed
Chuck Norris Joined: June/18/2011 Location: TEXAS Status: Offline Points: 122210 |
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" This is a serious question for the College graduates...You lost Eduardo when you said 'subtension' and 'Mil-Rad'.... " |
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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On a FFP scope the sub tensions of the reticle will always be the same, regardless of what magnification is set on. If it is 1mil at 3x, it will be 1mil at 15x, and everywhere in between!
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If it is tourist season, why can't we shoot them?
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Son of Ed
Chuck Norris Joined: June/18/2011 Location: TEXAS Status: Offline Points: 122210 |
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Visit the Ed Show
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NW425
Optics Apprentice Joined: May/16/2015 Location: NH Status: Offline Points: 56 |
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I was under the impression that it depended if the reticle was on the first or second focal plane.
I believe if it is on the first focal plane then the distance between marks is always constant, i.e. 1 mil will always be 1 mil. But if it's on the second focal plane, then there is 1 set variable used for sighting/distancing. I have found that for most scopes using SFP it is the 10x variation. I'm new to these kind of optics so you'd be better off waiting for someone else to respond but I hope to possibly provide some insight in the mean time :) |
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338LM
Optics GrassHopper Joined: April/26/2013 Location: LA Status: Offline Points: 27 |
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Thanks Billy
BTW... LOVE YOUR STATEMENT "If it is tourist season, why can't we shoot them?" |
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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The scope in question,I.E. a SS 3-15x42 is a FFP scope, hence my answer. It even says it is a FFP scope in the original post...
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If it is tourist season, why can't we shoot them?
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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Being from 15 miles south of Sedona Arizona tends to give people a certain attitude...
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If it is tourist season, why can't we shoot them?
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helo18
Optics Jedi Knight Joined: December/02/2006 Location: Montana Status: Offline Points: 5620 |
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I would say come visit Montana to get away from there for a while, but then you might be a tourist.
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To be prepared for War is one of the most effectual means of preserving peace.
GEORGE WASHINGTON |
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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Its cold enough down here in Colorado! I have been here a couple of months now and have yet to have a week when it hasn't snowed...
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If it is tourist season, why can't we shoot them?
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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Which makes it convenient for reliably consistent 2nd FP scopes. With a 6-24, "adjusted" to 12x for mil ranging, subtensions are 1/2 at 24x and double at 6x.
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Opinion,untempered by fact,is ignorance.
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