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Vortex Viper reticle question

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/09/2011 at 12:40
rash_powder View Drop Down
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on the 2.5 - 10x44 PST scope, is the reticle the same size as the one in the first focal plane models? 

If it is, man that is going to be difficult to see.  Right?

Looking for a new hunting scope, was thinking one from the PST line. 

Thanx,

Matt
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/09/2011 at 14:53
Skylar McMahon View Drop Down
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Matt-
No, It's going to be slightly different.
 
It's not difficult to see, but it will be difficult to subtend, unlike the 4-16x50 FFP.
The subtentions are only accurate on 10X on the 2.5-10.
On 5X you will have to double the measurement and on 3x you would have to triple your measurement.
 
You are going to have to some math if you intend to use the reticle for ranging.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/10/2011 at 14:04
Skylar McMahon View Drop Down
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After reading this I feel there is somethings I need to clarify.
 since the 2.5-10 is not first focal plane, the reticle will not be magnified as you twist the wheel. The picture is the only one that I could find for the 2.5-10.
He was curious if the reticle would be hard to see, I don't think that it would be, but you wouldn't be able to subtend it correctly like you would if it was FFP. So the mesurements are going to be different 2.5x, 3.3X, 5x and 10x.
The measurements are only accurate on 10x.
My thoughts on being able to subtend it, would be divided by the correct mag.
On 5x you would have to multiply it by the correct mag. 5 goes into 10 two times. So when measure it, if it's accurate on 10x (10x = .10 milrad{.36" @ 100 yards}) You would have to double the measurement for 5x magnification because it is half. And likewise for 2.5x, you would have to triple that measurement in order to match the measurements of the reticle with the turrets.
But my math is is wrong.
 
Q: I have an 18 inch KNOWN target that subtends 1mil on my scope which is a second FP set on 3x. How far away, based upon your information, is my target?
 
Intially I was (over) thinking:

On 3X you are covering 1 mil.

1 mil on 3x would be 3.33 on 10X.

On 10x your target would appear to be 60”

60 x 27.778

3.33

Equals 500.50 yards.

The amount of math on SFP is unnecessary when you could use FFP in order to subtend the reticle for ranging. Since it would be used for a hunting scope, you could use SFP, but if you wanted to use the reticle to range effectively, you have to do alot of math and conversions.
 
I was informed that my formula was incorrect.
The target is 18" tall, it doesn't matter if you look at the target on 1X or on 100X, the target is the same size, it never changes.
I was calculating how large the hash mark or mil-dot would be on the target not the actual target size.
The correct formula should be;
18 x 27.778
---------------
3.33
Should be 150.15 yards
 
1mil at 3x is the same as 3.333333333333335 (approximtely)mils at 10x therefore your distance would be 150yds. Same scope at 5x, 1mil would represent 2mils in actuality, at 20x would represent .5mil. Apparent size of target is meaningless. Target is still 18 inches only the mil representation has changed.
 
 
 
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/03/2011 at 09:00
CROWSNIPER View Drop Down
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MOA seems so much easier to me than MIL
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/03/2011 at 17:00
Urimaginaryfrnd View Drop Down
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Originally posted by CROWSNIPER CROWSNIPER wrote:

MOA seems so much easier to me than MIL
Ying Yang
If your reticle is mil based then it makes sense to have the adjustments be in mil that way when you need to dial in 2.5mil you can dial .5 and hold on the second mil down which makes it very fast to use.  Also when sighting in a MIL MIL scope put the x on the center and polk a hole in the target use the reticle to measure how many mil high or low and left or right and dial in with  the same incriment  (MIL) as the reticle next shot should be in the X ring.   Where it gets a little cloudy for me is knowing how much movement one click will become at several hundred yards because with MOA it is easy to know that at 600 yds 1 MOA is 6 inches so each 1/4 moa click wil be 1/4 of 6 inches for a movement of 1.5 inches per click. With Mil I would have to give it more thought but if you are behind the scope you can figure that 1/10 mil distance by looking at it with the reticle.
With a spotter using a mil based spotting scope the MIL MIL system becomes way better.


Edited by Urimaginaryfrnd - December/03/2011 at 17:02
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