Clip - On Image Intensifiers and Thermal Vision

Status
Not open for further replies.
Joined
May 6, 2020
Messages
1,688
I'm having some difficulty imagining how these things work - how do they not mess up how the rifle was zeroed?

They're basically presenting another image, which may be totally misaligned, to the scope.

Is there a separate zeroing step for the clip - on device?
 
Jury is still out on many of these.

But, the premise is simple, you either offer up the intensified image to either the front or the rear of the targeting glass.

The imagers are just rendering what you cannot see because of darkness in a format that you can see. The Imagers do not provide magnification or targeting per se (unless an actual sight themselves).

Now, 9 Hole review just published a video on NVGs and similar devices. These are not clip ons--but the discussion on what "night vision is" is good.
 
1B833FD4-A567-4A96-9067-806B96C81736.jpeg

I’ll watch the video in a couple.

These things were what I was curious about.

In my simplistic mind, that’s like putting a weirdo prism right in front of your perfectly - zeroed Schmidt and messing it up...
 
I think the trick to image intensifiers is that, they're not presenting the image like a TV screen, where the image is 2 dimensional and fixed on the x/y axes on the plane of the output, but rather transmits and amplifies photons in a collimated manner, more like lenses of a traditional scope. As a result, it can have an essentially parallax-free image transmission, within a certain range.

So it's not like a low-light TV that displays an image on a screen at the back, but more like a scope that just adds photons as ambient photons pass through it, without changing the path those ambient photons would have taken through the lenses.

images (3).jpeg

I could be wrong, and I'm happy to be corrected by someone who understands these things better than me
 
I do not have tons of experience using them because the one time I did, there was a zero shift between the scope alone and the crosshairs on the projected image.

7BEF0282-9A89-4151-9A08-AB8BA789E83E.jpeg 413BEF27-BE12-4CC9-97FD-EAF2F3ABB189.jpeg

That’s not cheap hardware either, that thing is $8k.

It was a rifle scope in and of itself too, so you could use it all by itself, as I did. Just QD on/off when I wanted one or the other. Less stuff to carry around when you didn’t need it too.
 
Last edited:
Scroll down about halfway in this thread
https://www.thehighroad.org/index.php?threads/long-distance-night-shoots.664418/#post-8230798


the short answer is they are collimated as drifter said. The collimation can be off and require adjustment.

You may have a .1-.2 mil shift in zero. However,
1 most people can’t shoot that tight at night anyway and would never know
2 most people don’t know what their zero shift is for changing light conditions anyway and won’t know if the shift is from clip on or light. Eg at night both my impacts (6.5x47 and 6dasher) shoot .2 high so my zero is two clicks down from the “0”. And there is no shift for the pvs-27 on the 6.5x47. I don’t have a nv rail set up on the foundation stock so never tried the pvs27 with the dasher.
 
Status
Not open for further replies.
Back
Top