Well, they didn't get crushed on a bull..... I'm just saying...

Thanks for the tips and info guys.... I am trying to place my head in the same spot every time.. Practice practice...

Thevic wrote:great, tomorrow I'm going to be spending an hour checking my parallax and focus at different ranges.

don't forget to combine different magnifications into it too.
Magnification changes the parallax setting on most scopes.
So if you put marks on the knob, make sure you know what magnification those marks are accurate for because they most likely won't be accurate at all of the magnifications that your scope offers...

AR15barrels wrote:
don't forget to combine different magnifications into it too.
Magnification changes the parallax setting on most scopes.
So if you put marks on the knob, make sure you know what magnification those marks are accurate for because they most likely won't be accurate at all of the magnifications that your scope offers...

Does 1st or 2nd FP make a difference in this?

Gnzrme wrote:
Does 1st or 2nd FP make a difference in this?

I think it might because when they stick the reticle on the first focal plane, the reticle no longer changes in relation to the image as the magnification is adjusted.
I'm not sure though.

Schmidt & bender has distance marks on their parallax knobs and I remember how accurate Ryan used to say they were.
I think it's just a matter of Designing the zoom section so that it does not effect the focusing section.
That's like designing a zoom lens for a camera where focus distance and focal length are independent of each other compared to a variable prime lens design where the focus distance shifts with the focal length.

AR15barrels wrote:
Schmidt & bender has distance marks on their parallax knobs and I remember how accurate Ryan used to say they were.

The first one I had was very accurate in regard to focus at those marked distances. I wasn't a very good shooter at that time and erroneously figured since it was an S&B, parallax and focus would line up. So I rarely checked for parallax, just focus. After getting more experience with a multitude of other optics, I saw it was more often than not that parallax free and in focus did not coincide.

Good read.

http://rimfirebenchrest.com/articles/parallax1.html" onclick="window.open(this.href);return false;
http://rimfirebenchrest.com/articles/parallax2.html" onclick="window.open(this.href);return false;
http://rimfirebenchrest.com/articles/parallax.html" onclick="window.open(this.href);return false;

.
What I am wondering is if parallax is even an issue in regards to the "close in" targets.
As an experiment, next time I go to the range I will purposely set my parallax to crap and then try a dot drill.

Teletiger7 wrote:.
What I am wondering is if parallax is even an issue in regards to the "close in" targets.

It depends on the consistency of your cheekweld.
You don't need to adjust parallax if your eye is in the exact same spot behind the scope for every shot.

Gnzrme wrote:
Does 1st or 2nd FP make a difference in this?

That's a good question. In thinking about some, it seems reasonable that SFP reticle might be more sensitive to parallax than a FFP reticle, because of where the reticle is. Though I don't know if the difference is pronounced enough to be noticeable.