Problem:Big change in POI when adjusting magnification

Mauser GDog

Mauser GDog

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Have a Falcon Menace 1.5-5 x30 IR purchased from a CGN sponsor mounted on a .308

http://www.falconoptics.com/1.5-5x30IR.php

Reticle is installed on the Second Focal Plane and the user guide states that "the zeroed point of impact should remain unchanged across the entire magnification range"

I zeroed the scope at 100m @ 5x power (max) but when I drop the magnification the POI rises a lot. At 100m going from 5x down to 3x raised it 1.5-2.0 MRAD (15-20 cm) and at the lowest 1.5x power it was almost off paper, raised at least 2.5-3.0 MRAD!

Got home and did some reading and first thing I realized was I don't know JACK about optics! :redface: That said, after an hour of reading I now understand the differences and pros and cons of First Focal Plane reticles and Second Focal Plane reticles.

From what I understand, FFP will never shift POI but the reticle changes size as you change magnification. Most people go on to say that a quality Variable power scope with SFP reticle should not change the POI significantly.

This is a $250-$300 scope, which I realize is not exactly top of the line, but would anyone agree that there is something wrong with mine?
 
Are you zeroing to the center crosshairs or a hold-over point down the reticle? If its center of the reticle then there is something wrong as that should never happen. I'm strongly considering one of these too :(
 
That symptom is one you will find on a less expensive scope, windage screw work a bit crooked, that cause shift in the POI, that can be fixed on warranty... JP.
 
If it has no repeatability(zero POI remains the same thru magnification changes) it is a paperweight and no longer a scope.

Sounds like reticle is no longer centered in the main tube when you adj. the power.
Return it to Manufacturer to be repaired under waranty.
 
All zeroing was done using the centre of the reticle.

I was careful not to over tighten the ARMS 22 QD rings it's mounted in, and took the scope out of the rings when I did some recent work on the rifle.

Is there anything else I should be aware of when mounting, other than not over tightening the rings?

Worst part is I've already had to return one of these to the retailer after the reticle/second focal plane came loose the first time I shot with it, spinning the reticle 15 degrees in the tube. The board sponsor I bought it from replaced it no questions asked, but I'm starting to think about biting the bullet and spending more money on a better scope.
 
caramel said:
That symptom is one you will find on a less expensive scope, windage screw work a bit crooked, that cause shift in the POI, that can be fixed on warranty... JP.
Click to expand...

Correct. There are plenty of things that go into the cost of high quality optics, this scenario is but one of the reasons that with optics you get what you pay for.
 
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