Thermal behind scope is useless

Published on May 26, 2025
Duration: 0:32

Thermal optics must be mounted in front of an LPVO or any scope with glass, as thermal sensors cannot penetrate glass. Placing a thermal behind the objective lens results in a blank image due to blocked thermal radiation and incorrect eye relief. This configuration renders the thermal optic useless for practical application.

Quick Summary

Thermal optics must be mounted in front of LPVOs and other scopes with glass because thermal sensors cannot see through glass. Placing a thermal behind the objective lens blocks thermal radiation, resulting in a blank image and incorrect eye relief, rendering the setup useless.

Chapters

  1. 00:00Thermal Placement Basics: Front vs. Rear
  2. 00:08Front Placement Demonstration: Clear Thermal Image
  3. 00:12Rear Placement Failure: Useless Setup
  4. 00:24Technical Conclusion: Glass Blocks Thermal

Frequently Asked Questions

Can a thermal scope be mounted behind an LPVO?

No, a thermal scope cannot be mounted behind an LPVO or any scope with glass. Thermal sensors cannot see through glass, so placing the thermal unit behind the objective lens will result in a blank or useless image.

Why does a thermal optic fail when placed behind a scope?

When placed behind a scope with glass, the thermal sensor is blocked by the glass material, preventing it from detecting thermal radiation. This results in a blank screen and incorrect eye relief, rendering the setup ineffective.

Where should a thermal clip-on optic be mounted?

A thermal clip-on optic should always be mounted in front of the objective lens of your primary optic, such as an LPVO or rifle scope. This ensures the thermal sensor has a clear view and is not obstructed by glass.

What is the main limitation of thermal imaging regarding optics?

The primary limitation is that thermal sensors cannot penetrate glass. This means any optic containing glass, like a traditional rifle scope or red dot sight, will block thermal radiation if the thermal device is placed behind it.

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