Lessons

What Is NETD in Thermal Scopes? Guide to Thermal Sensitivity and mK Ratings

by TDX Optics on Jul 23 2026

While resolution and magnification get the most marketing attention, NETD is actually the unsung hero of your thermal scope’s performance. It is the core metric that determines whether you will see a clear, detailed picture or a blurry, washed-out grey screen when environmental conditions get tough.

#Contrast
#Sensor
#Weather

TDX Thermal optic mounted as a clip-on to another scope, sitting in light rain

Lessons

Why Weather Matters: How Rain, Fog, and Humidity Affect Your Thermal Optic

by TDX Optics on Jun 25 2026

You bought a top-tier thermal optic, and on your first clear, cold night, the image is unbelievably sharp. But a few weeks later, you head out on a warm, humid evening, and the display looks flat, fuzzy, and washed out. You might wonder: is your scope broken?

#Contrast
#Weather

Bellator Thermal Rifle Sight

Dominator Multi-Purpose Thermal Monocular

Praedator Thermal Rifle Scope

Dominator Multi-Purpose Thermal Monocular

Perceptor Handheld Thermal Monocular with Integrated Laser Rangefinder and Ballistics

Lessons