I've had thermal devices for some time but I recently got my first clip-on, a TigIR 6z+. I am loving it so far but I am puzzled by an optical issue that I am having trouble understanding. Props to Horta for answering some earlier questions by DM but I figured I should stop pestering him and consult the hive. Here's what I am seeing:
Setup #1:
This is the Tig on its 38mm mount and paired with a Trijicon 1-8 in an ADM Recon-S 1.55" mount. These should be pretty well-matched, right? Well, when I look through the scope, the view is clearly and significantly shifted toward the bottom of the Tig screen by about 20%. I took a photo on 3x power to try to show this. You can see how the top of the screen is cut off by the circle of the day scope much more than the bottom is:
I recognize it's not the best photo, but hopefully you'll take my word for it.
Setup #2:
Same rifle and day scope, but the Tig is now on the 36mm mount. Obviously there is now a much more noticeable offset between the optic heights. And yet, here is the view through the scope at the same magnification setting:
The screen is noticeably more centered in the day scope and the top margin of the screen is much less cut-off by the Trijicon.
Setup 3:
This is a different rifle but one that also runs the same Trijicon 1-8 scope, but in a much lower set of APA rings. The Tig is still on its 38mm mount and obviously there is now a huge offset between the optics. And yet...
...it gives the best-centered view of all, with the Tig screen roughly centered in the scope and symmetric amounts of margin cut-off at the top and bottom. I have to turn up the screen brightness in this setup, which makes sense since half the light from the Tig is missing the day optic. But it's still the best view by a significant margin.
How can this be? I was under the impression that you generally want to match your optic height to your clip-on height, and yet the most precisely matched setup here gives the worst view. It's super-annoying in Setup #1; above ~4x I feel like I am losing a significant amount of the top of the screen that I don't lose on Setup #3 despite its huge offset. I understand from my discussion with Horta that all three setups should be GTG for shooting as long as I can collimate them appropriately, but I don't want to lose a bunch of my overwatch/surveillance capability to screen cut-off. Any help or lessons welcome.
Setup #1:
This is the Tig on its 38mm mount and paired with a Trijicon 1-8 in an ADM Recon-S 1.55" mount. These should be pretty well-matched, right? Well, when I look through the scope, the view is clearly and significantly shifted toward the bottom of the Tig screen by about 20%. I took a photo on 3x power to try to show this. You can see how the top of the screen is cut off by the circle of the day scope much more than the bottom is:
I recognize it's not the best photo, but hopefully you'll take my word for it.
Setup #2:
Same rifle and day scope, but the Tig is now on the 36mm mount. Obviously there is now a much more noticeable offset between the optic heights. And yet, here is the view through the scope at the same magnification setting:
The screen is noticeably more centered in the day scope and the top margin of the screen is much less cut-off by the Trijicon.
Setup 3:
This is a different rifle but one that also runs the same Trijicon 1-8 scope, but in a much lower set of APA rings. The Tig is still on its 38mm mount and obviously there is now a huge offset between the optics. And yet...
...it gives the best-centered view of all, with the Tig screen roughly centered in the scope and symmetric amounts of margin cut-off at the top and bottom. I have to turn up the screen brightness in this setup, which makes sense since half the light from the Tig is missing the day optic. But it's still the best view by a significant margin.
How can this be? I was under the impression that you generally want to match your optic height to your clip-on height, and yet the most precisely matched setup here gives the worst view. It's super-annoying in Setup #1; above ~4x I feel like I am losing a significant amount of the top of the screen that I don't lose on Setup #3 despite its huge offset. I understand from my discussion with Horta that all three setups should be GTG for shooting as long as I can collimate them appropriately, but I don't want to lose a bunch of my overwatch/surveillance capability to screen cut-off. Any help or lessons welcome.
