Thermal behind scope is useless

Published on May 26, 2025
Duration: 0:32

This guide details the correct procedure for mounting a thermal clip-on optic in conjunction with an LPVO (Low Power Variable Optic). It emphasizes that thermal sensors must be placed on the objective (front) side of the LPVO because thermal radiation cannot penetrate glass. Improper rear mounting renders the thermal useless, as it will only detect the scope's glass, not external targets. The demonstration highlights the importance of correct placement for effective target acquisition in low-light or no-light conditions.

Quick Summary

Thermal optics must be mounted in front of LPVOs because thermal sensors cannot penetrate glass. Placing a thermal clip-on behind an LPVO results in a blank image, as the sensor detects only the scope's glass, rendering it useless for target acquisition and potentially affecting eye relief.

Chapters

  1. 00:00Introduction: Thermal Behind Scope?
  2. 00:08Front Placement Demonstration
  3. 00:12Rear Placement Failure
  4. 00:24Technical Conclusion

Frequently Asked Questions

Why should a thermal optic be mounted in front of an LPVO?

A thermal optic must be mounted in front of an LPVO because thermal sensors cannot see through glass. Placing it behind the LPVO means the sensor will only detect the scope's glass, rendering the thermal image blank and useless for target acquisition.

What happens if you mount a thermal clip-on behind an LPVO?

Mounting a thermal clip-on behind an LPVO makes the setup useless. The thermal sensor will detect nothing but the glass of the scope, resulting in a blank image. Additionally, it can negatively affect the shooter's eye relief, hindering proper aiming.

Can thermal optics see through glass?

No, thermal sensors cannot see through glass. This fundamental limitation means that any optic utilizing glass lenses, such as LPVOs or red dot sights, will block thermal imaging if the thermal sensor is placed behind them.

What is the correct way to mount a thermal clip-on with an LPVO?

The correct way to mount a thermal clip-on with an LPVO is to position the thermal unit on the objective (front) side of the LPVO. This ensures the thermal sensor faces the target and is not obstructed by the primary optic's glass elements.

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