Rifle Scopes Interesting observation with my SS 10x42M

[skydiver]

I was shooting a 100 yards the other day using my SS 10x42M scope on my Savage 10FCP-K.
I was using a target that has a orange dot with a black diamond inside the dot.
I adjusted the parallax as normal but I noticed that the black diamond would move within the orange dot and the reticle if I moved my eye in relationship to the scope.
Now this seems strange to me because I would think that if this was a parallax issue the whole target would move in relation to the reticle not just the center black diamond. I also tried different adjustments with the parallax and still had the same results.
So does anybody have any idea what I am seeing here?
I called and talked to the folks at SWFA and they didn't have any idea as to what I was talking about.

 

[ken226]

Re: Interesting observation with my SS 10x42M

Sounds like mirage.

The sun heating the ground, which conducts heat into the air, as the air rises it diffracts the light passing through.

If not mirage, its possible that you were seeing an optical illusion caused by the dark orange dot superimposed over the bright orange background. I usually print the storm tactical diamond targets. 5 1moa diamonds on a 1moa background grid.

 

[skydiver]

Re: Interesting observation with my SS 10x42M

ken,
Don't think it was mirage as I was shooting a 100 yards with no mirage visible and stable conditions.

But the optical illusion theory is defiantly possible.
Like to hear more from others on this possibility.

 

[roggom]

Re: Interesting observation with my SS 10x42M

I get the same thing at the indoor range and my Weaver 3-15 emdr, using the Birchwood Casey 1.5" stick on orange targets. I adjust the parallax for 100Y The little diamond kinda dances around as you move your head, but the whole sticker does not move. Not sure why it is but I just line the black dot up and shoot.

Im gonna try to capture on a camera next time Im at the range.

 

[Frank]

Was readin some old post and found this one. The answer is real simple, a lot of parallax adjustments are not exact. Even on target scopes I do the head movement and readjust the parallax til I get it all out. The 100 yd mark is just a close starting point.

 

[Cncjerry]

The only thing I could think of that would do that, setting mirage aside which is sort of the same refraction issue, is an improperly ground glass, or a glass with a curve that doesn't cooperate with your eye, glasses or contacts. I don't know much about optics, but different wavelength light refracts differently and the trick in grinding glass is to get all the colors at the same focal point. I had a pair of glasses that were cut wrong, I think it was called the 'base curve' and I thought I was tripping as I looked off center and the white 'Stop' was moving around in a red Stop Sign. Don't remember the correct terminology for the the problem, color aberration?