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So the last time I was in -40 was never and I've seen 105 maybe. Maybe. I understand the potential danger but wouldn't your battery crap just as bad at either of those extremes?
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It's not just the extremes. The zero CONTINUOUSLY floats as the temp varies. It doesn't "go back to zero" when the temp goes back to what it was when you zeroed it.
So the longer you go without rezeroing it, the further the zero can get from actual.
Additionally 122 degrees is common in the Middle East. I've seen higher. So being of by 4MOA in Iraq was probably not just a possibility, but reality.
Dave Harrington said:The solution to EOtech problems comes in an Aimpoint box.
You're the second person to quote Dave on this matter, and that's enough for me. I ditched my 512 a little over a year ago, and went with a PRO this spring. I plan on putting the PRO on something else and putting a T-1 on my go to rifle. Though the MRO from Triji looks pretty sexy with a larger objective and not much larger footprint than a T-1. I got to fondle one at a class, but didn't get to shoot it, and am looking forward to trying it out for real.
Class action lawsuit anyone?
Indeed!
The CTO replied that the “sight would have [a] problem at -40 deg even at 1x due
to excessive parallax error” and that “[t]he parallax error even at 32 deg F is 12 moa, at 5 deg F (the
temperature outside right now) is > 20 moa. . . . It is not an acceptable performance. People have
to know what needto be done so they can start planning for it. . . . Sometimes the truth is the best
answer.”
64. In other words, even at 32 degrees Fahrenheit, the sight’s accuracy varied by 12
inches per 100 yards, and at 5 degrees, the sight’s accuracy varied by more than 20 inches per 100
yards.
So you zero at 68F, lower temp by 36F and it's off a FOOT at 100yds. That's pretty absurd.